TY  - JOUR
AU  - Brzić, Danica
AU  - Pešić, Radojica
AU  - Arsenijević, Zorana
AU  - Đuriš, Mihal
AU  - Bošković-Vragolović, Nevenka
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5052
AB  - The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.
PB  - Taylor & Francis Online
T2  - Particulate Science and Technology
T1  - Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime
EP  - 83
IS  - 1
SP  - 75
VL  - 41
DO  - https://doi.org/10.1080/02726351.2022.2053015
ER  - 

@article{
author = "Brzić, Danica and Pešić, Radojica and Arsenijević, Zorana and Đuriš, Mihal and Bošković-Vragolović, Nevenka and Kaluđerović-Radoičić, Tatjana",
year = "2022",
abstract = "The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.",
publisher = "Taylor & Francis Online",
journal = "Particulate Science and Technology",
title = "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime",
pages = "83-75",
number = "1",
volume = "41",
doi = "https://doi.org/10.1080/02726351.2022.2053015"
}

Brzić, D., Pešić, R., Arsenijević, Z., Đuriš, M., Bošković-Vragolović, N.,& Kaluđerović-Radoičić, T.. (2022). Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology
Taylor & Francis Online., 41(1), 75-83.
https://doi.org/https://doi.org/10.1080/02726351.2022.2053015

Brzić D, Pešić R, Arsenijević Z, Đuriš M, Bošković-Vragolović N, Kaluđerović-Radoičić T. Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology. 2022;41(1):75-83.
doi:https://doi.org/10.1080/02726351.2022.2053015 .

Brzić, Danica, Pešić, Radojica, Arsenijević, Zorana, Đuriš, Mihal, Bošković-Vragolović, Nevenka, Kaluđerović-Radoičić, Tatjana, "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime" in Particulate Science and Technology, 41, no. 1 (2022):75-83,
https://doi.org/https://doi.org/10.1080/02726351.2022.2053015 . .

TY  - JOUR
AU  - Živković, Luka
AU  - Pohar, Andrej
AU  - Likozar, Blaž
AU  - Nikačević, Nikola
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4341
AB  - In this feasibility study, a novel industrial-scale reactor structure for continuous hydrogen production via intensified water-gas shift (WGS) reaction is proposed. It considers both trickling calcium-oxide sorbent for carbon dioxide removal (SOR) and Pd-based membrane for hydrogen separation (MEM). It is shown that WGS, SOR, MEM, and cooling can be decoupled with a special reactor superstructure mathematically represented with the pseudo-homogenous one-dimensional model. The final reactor structure and operating conditions are determined by using rigorous multi-objective optimization. Two objective functions take all main costs into account (total reactor volume and respective volumetric fractions for the catalyst, sorbent, and membrane) and the main benefit (hydrogen yield). The results show that the best cost-benefit relation can be achieved with the two-module reactor and combined WGS and SOR processes, with 95% carbon monoxide conversion (64% higher than the equilibrium conversion at the same conditions) and the outlet-stream containing only 0.7% of carbon dioxide.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemical Engineering Science
T1  - Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction
VL  - 211
DO  - 10.1016/j.ces.2019.115174
ER  - 

@article{
author = "Živković, Luka and Pohar, Andrej and Likozar, Blaž and Nikačević, Nikola",
year = "2020",
abstract = "In this feasibility study, a novel industrial-scale reactor structure for continuous hydrogen production via intensified water-gas shift (WGS) reaction is proposed. It considers both trickling calcium-oxide sorbent for carbon dioxide removal (SOR) and Pd-based membrane for hydrogen separation (MEM). It is shown that WGS, SOR, MEM, and cooling can be decoupled with a special reactor superstructure mathematically represented with the pseudo-homogenous one-dimensional model. The final reactor structure and operating conditions are determined by using rigorous multi-objective optimization. Two objective functions take all main costs into account (total reactor volume and respective volumetric fractions for the catalyst, sorbent, and membrane) and the main benefit (hydrogen yield). The results show that the best cost-benefit relation can be achieved with the two-module reactor and combined WGS and SOR processes, with 95% carbon monoxide conversion (64% higher than the equilibrium conversion at the same conditions) and the outlet-stream containing only 0.7% of carbon dioxide.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemical Engineering Science",
title = "Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction",
volume = "211",
doi = "10.1016/j.ces.2019.115174"
}

Živković, L., Pohar, A., Likozar, B.,& Nikačević, N.. (2020). Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction. in Chemical Engineering Science
Pergamon-Elsevier Science Ltd, Oxford., 211.
https://doi.org/10.1016/j.ces.2019.115174

Živković L, Pohar A, Likozar B, Nikačević N. Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction. in Chemical Engineering Science. 2020;211.
doi:10.1016/j.ces.2019.115174 .

Živković, Luka, Pohar, Andrej, Likozar, Blaž, Nikačević, Nikola, "Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction" in Chemical Engineering Science, 211 (2020),
https://doi.org/10.1016/j.ces.2019.115174 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Garić-Grulović, Radmila
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4462
AB  - In this study, we applied the variational model to fluidization of small spherical particles. Fluidization experiments were carried out for spherical particles with 13 diameters between d(p) = 0.13 and 5.00 mm. We propose a generalized form of our variational model to predict the superficial velocity U and interphase drag coefficient beta by introducing an exponent n to describe the different dependences of the drag force F-d on fluid velocity for different particle sizes (different flow regimes). By comparing the predictions with the experimental results, we conclude that n=1 should be used for small particles (d(p)  lt  1 mm) and n = 2 for larger particles (d(p)  gt  1 mm). This conclusion is generalized by proposing n = 1 for particles with Re-t  lt  160 and n = 2 for particles with Re-t  gt  160. The average mean absolute error was 5.49% in calculating superficial velocity for different bed voidages using the modified variational model for all of the particles examined. The calculated values of beta were compared with values of literature models for particles with d(p)  lt  1.0 mm. The average mean absolute error of the modified variational model was 8.02% in calculating beta for different bed voidages for all of the particles examined.
PB  - Elsevier Science Inc, New York
T2  - Particuology
T1  - Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles
EP  - 192
SP  - 184
VL  - 51
DO  - 10.1016/j.partic.2019.11.002
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Garić-Grulović, Radmila and Kaluđerović-Radoičić, Tatjana",
year = "2020",
abstract = "In this study, we applied the variational model to fluidization of small spherical particles. Fluidization experiments were carried out for spherical particles with 13 diameters between d(p) = 0.13 and 5.00 mm. We propose a generalized form of our variational model to predict the superficial velocity U and interphase drag coefficient beta by introducing an exponent n to describe the different dependences of the drag force F-d on fluid velocity for different particle sizes (different flow regimes). By comparing the predictions with the experimental results, we conclude that n=1 should be used for small particles (d(p)  lt  1 mm) and n = 2 for larger particles (d(p)  gt  1 mm). This conclusion is generalized by proposing n = 1 for particles with Re-t  lt  160 and n = 2 for particles with Re-t  gt  160. The average mean absolute error was 5.49% in calculating superficial velocity for different bed voidages using the modified variational model for all of the particles examined. The calculated values of beta were compared with values of literature models for particles with d(p)  lt  1.0 mm. The average mean absolute error of the modified variational model was 8.02% in calculating beta for different bed voidages for all of the particles examined.",
publisher = "Elsevier Science Inc, New York",
journal = "Particuology",
title = "Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles",
pages = "192-184",
volume = "51",
doi = "10.1016/j.partic.2019.11.002"
}

Đuriš, M., Arsenijević, Z., Garić-Grulović, R.,& Kaluđerović-Radoičić, T.. (2020). Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles. in Particuology
Elsevier Science Inc, New York., 51, 184-192.
https://doi.org/10.1016/j.partic.2019.11.002

Đuriš M, Arsenijević Z, Garić-Grulović R, Kaluđerović-Radoičić T. Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles. in Particuology. 2020;51:184-192.
doi:10.1016/j.partic.2019.11.002 .

Đuriš, Mihal, Arsenijević, Zorana, Garić-Grulović, Radmila, Kaluđerović-Radoičić, Tatjana, "Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles" in Particuology, 51 (2020):184-192,
https://doi.org/10.1016/j.partic.2019.11.002 . .

TY  - JOUR
AU  - Živković, Luka
AU  - Kandaswamy, Saikrishnan
AU  - Petkovska, Menka
AU  - Vidaković-Koch, Tanja
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4446
AB  - The intensification of an electrochemical process by forced periodic operation was studied for the first time using the computer-aided Nonlinear Frequency Response method. This method enabled the automatic generation of frequency response functions and the DC components (Faradaic rectification) of the cost (overpotential) and benefit (current density) indicators. The case study, oxygen reduction reaction, was investigated both experimentally and theoretically. The results of the cost-benefit indicator analysis show that forced periodic change of electrode potential can be superior when compared to the steady-state regime for specific operational parameters. When the electrode rotation rate is changed periodically, the process will always deteriorate as the dynamic operation will inevitably lead to the thickening of the diffusion layer. This phenomenon is explained both from a mathematical and a physical point of view.
PB  - Frontiers Media Sa, Lausanne
T2  - Frontiers in Chemistry
T1  - Evaluation of Electrochemical Process Improvement Using the Computer-Aided Nonlinear Frequency Response Method: Oxygen Reduction Reaction in Alkaline Media
VL  - 8
DO  - 10.3389/fchem.2020.579869
ER  - 

@article{
author = "Živković, Luka and Kandaswamy, Saikrishnan and Petkovska, Menka and Vidaković-Koch, Tanja",
year = "2020",
abstract = "The intensification of an electrochemical process by forced periodic operation was studied for the first time using the computer-aided Nonlinear Frequency Response method. This method enabled the automatic generation of frequency response functions and the DC components (Faradaic rectification) of the cost (overpotential) and benefit (current density) indicators. The case study, oxygen reduction reaction, was investigated both experimentally and theoretically. The results of the cost-benefit indicator analysis show that forced periodic change of electrode potential can be superior when compared to the steady-state regime for specific operational parameters. When the electrode rotation rate is changed periodically, the process will always deteriorate as the dynamic operation will inevitably lead to the thickening of the diffusion layer. This phenomenon is explained both from a mathematical and a physical point of view.",
publisher = "Frontiers Media Sa, Lausanne",
journal = "Frontiers in Chemistry",
title = "Evaluation of Electrochemical Process Improvement Using the Computer-Aided Nonlinear Frequency Response Method: Oxygen Reduction Reaction in Alkaline Media",
volume = "8",
doi = "10.3389/fchem.2020.579869"
}

Živković, L., Kandaswamy, S., Petkovska, M.,& Vidaković-Koch, T.. (2020). Evaluation of Electrochemical Process Improvement Using the Computer-Aided Nonlinear Frequency Response Method: Oxygen Reduction Reaction in Alkaline Media. in Frontiers in Chemistry
Frontiers Media Sa, Lausanne., 8.
https://doi.org/10.3389/fchem.2020.579869

Živković L, Kandaswamy S, Petkovska M, Vidaković-Koch T. Evaluation of Electrochemical Process Improvement Using the Computer-Aided Nonlinear Frequency Response Method: Oxygen Reduction Reaction in Alkaline Media. in Frontiers in Chemistry. 2020;8.
doi:10.3389/fchem.2020.579869 .

Živković, Luka, Kandaswamy, Saikrishnan, Petkovska, Menka, Vidaković-Koch, Tanja, "Evaluation of Electrochemical Process Improvement Using the Computer-Aided Nonlinear Frequency Response Method: Oxygen Reduction Reaction in Alkaline Media" in Frontiers in Chemistry, 8 (2020),
https://doi.org/10.3389/fchem.2020.579869 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4381
AB  - Fluidization experiments were performed by using spherical and non-spherical particles to examine the sensitivity of the variational model to three input parameters: U-mf, epsilon(mf) and U-t. Several correlations for U-mf, epsilon(mf) and U-t were tested and the results were compared with the experimental values. The variational model's ability to predict the bed expansion (in the form of U = f(epsilon)) and the interphase drag coefficient was investigated by varying the three input variables by +/- 20% compared with their experimental values. The variational model for the bed expansion showed the greatest sensitivity to changes in the epsilon(mf) values. The overestimated values of epsilon(mf) resulted in underestimating U(epsilon), and likewise, the underestimated values of epsilon(mf) resulted in overestimating U(epsilon). The variational model's sensitivity to changes in the U-mf values is also important. Contrary to epsilon(mf), overestimating the values of U-mf resulted in overestimating U(epsilon). The model's least sensitivity was to the U-t value variation, which, if varied by +/- 20% compared with their experimental values, had a negligible effect on the prediction quality. This study aims to examine the sensitivity of the variational model to U-mf,U- U-t and epsilon(mf) values obtained from various correlations, in the absence of experimental values.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Particulate Science and Technology
T1  - Sensitivity analysis of the variational model for the particulate expansion of fluidized beds
EP  - 104
IS  - 1
SP  - 95
VL  - 38
DO  - 10.1080/02726351.2018.1508100
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Kaluđerović-Radoičić, Tatjana",
year = "2020",
abstract = "Fluidization experiments were performed by using spherical and non-spherical particles to examine the sensitivity of the variational model to three input parameters: U-mf, epsilon(mf) and U-t. Several correlations for U-mf, epsilon(mf) and U-t were tested and the results were compared with the experimental values. The variational model's ability to predict the bed expansion (in the form of U = f(epsilon)) and the interphase drag coefficient was investigated by varying the three input variables by +/- 20% compared with their experimental values. The variational model for the bed expansion showed the greatest sensitivity to changes in the epsilon(mf) values. The overestimated values of epsilon(mf) resulted in underestimating U(epsilon), and likewise, the underestimated values of epsilon(mf) resulted in overestimating U(epsilon). The variational model's sensitivity to changes in the U-mf values is also important. Contrary to epsilon(mf), overestimating the values of U-mf resulted in overestimating U(epsilon). The model's least sensitivity was to the U-t value variation, which, if varied by +/- 20% compared with their experimental values, had a negligible effect on the prediction quality. This study aims to examine the sensitivity of the variational model to U-mf,U- U-t and epsilon(mf) values obtained from various correlations, in the absence of experimental values.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Particulate Science and Technology",
title = "Sensitivity analysis of the variational model for the particulate expansion of fluidized beds",
pages = "104-95",
number = "1",
volume = "38",
doi = "10.1080/02726351.2018.1508100"
}

Đuriš, M., Arsenijević, Z.,& Kaluđerović-Radoičić, T.. (2020). Sensitivity analysis of the variational model for the particulate expansion of fluidized beds. in Particulate Science and Technology
Taylor & Francis Inc, Philadelphia., 38(1), 95-104.
https://doi.org/10.1080/02726351.2018.1508100

Đuriš M, Arsenijević Z, Kaluđerović-Radoičić T. Sensitivity analysis of the variational model for the particulate expansion of fluidized beds. in Particulate Science and Technology. 2020;38(1):95-104.
doi:10.1080/02726351.2018.1508100 .

Đuriš, Mihal, Arsenijević, Zorana, Kaluđerović-Radoičić, Tatjana, "Sensitivity analysis of the variational model for the particulate expansion of fluidized beds" in Particulate Science and Technology, 38, no. 1 (2020):95-104,
https://doi.org/10.1080/02726351.2018.1508100 . .

TY  - JOUR
AU  - Kljajić, Nikola
AU  - Todić, Branislav
AU  - Slavnić, Danijela
AU  - Nikačević, Nikola
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4119
AB  - A detailed transient tridimensional CFD model of the turbulent flow of liquid phase inside of 26 mm diameter continuous oscillatory baffled reactor (COBR) was developed using STAR CCM+ software. The model considered a large number of COBR cavities separated with single-orifice baffles. The CFD model was validated using residence time distribution experiments with several flowrates and frequencies. Different from previous studies, flow oscillations in our work were generated using a membrane pump, which enabled lower amounts of backflow. Simulations were used to analyse flow patterns and mixing for several values of inlet flowrate and oscillation frequencies.
PB  - Elsevier Science Bv, Amsterdam
T2  - 29th European Symposium on Computer Aided Process Engineering, Pt A
T1  - Turbulent flow modeling in continuous oscillatory flow baffled reactor using STAR CCM
EP  - 846
SP  - 841
VL  - 46
DO  - 10.1016/B978-0-12-818634-3.50141-7
ER  - 

@article{
author = "Kljajić, Nikola and Todić, Branislav and Slavnić, Danijela and Nikačević, Nikola",
year = "2019",
abstract = "A detailed transient tridimensional CFD model of the turbulent flow of liquid phase inside of 26 mm diameter continuous oscillatory baffled reactor (COBR) was developed using STAR CCM+ software. The model considered a large number of COBR cavities separated with single-orifice baffles. The CFD model was validated using residence time distribution experiments with several flowrates and frequencies. Different from previous studies, flow oscillations in our work were generated using a membrane pump, which enabled lower amounts of backflow. Simulations were used to analyse flow patterns and mixing for several values of inlet flowrate and oscillation frequencies.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "29th European Symposium on Computer Aided Process Engineering, Pt A",
title = "Turbulent flow modeling in continuous oscillatory flow baffled reactor using STAR CCM",
pages = "846-841",
volume = "46",
doi = "10.1016/B978-0-12-818634-3.50141-7"
}

Kljajić, N., Todić, B., Slavnić, D.,& Nikačević, N.. (2019). Turbulent flow modeling in continuous oscillatory flow baffled reactor using STAR CCM. in 29th European Symposium on Computer Aided Process Engineering, Pt A
Elsevier Science Bv, Amsterdam., 46, 841-846.
https://doi.org/10.1016/B978-0-12-818634-3.50141-7

Kljajić N, Todić B, Slavnić D, Nikačević N. Turbulent flow modeling in continuous oscillatory flow baffled reactor using STAR CCM. in 29th European Symposium on Computer Aided Process Engineering, Pt A. 2019;46:841-846.
doi:10.1016/B978-0-12-818634-3.50141-7 .

Kljajić, Nikola, Todić, Branislav, Slavnić, Danijela, Nikačević, Nikola, "Turbulent flow modeling in continuous oscillatory flow baffled reactor using STAR CCM" in 29th European Symposium on Computer Aided Process Engineering, Pt A, 46 (2019):841-846,
https://doi.org/10.1016/B978-0-12-818634-3.50141-7 . .

TY  - JOUR
AU  - Slavnić, Danijela
AU  - Bugarski, Branko
AU  - Nikačević, Nikola
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4316
AB  - Transition from batch to continuous processing is an attractive alternative for the production of pharmaceutical, fine and bio chemicals. In a number of such industrial reactions or separations, a solid phase is present either as a reactant, product or catalyst. Instead of conventional continuous reactors, the utilization of oscillatory flow reactors could be advantageous. The flow pattern of solids in a continuous oscillatory baffled reactor (COBR), into which solids are introduced continuously, was investigated experimentally and theoretically. The effects of operating conditions on a solids flow regime, solids mean residence time and dispersion and solids holdup were analyzed and quantified. Four solids flow regimes named as: Creeping solids flow, Dense solids flow, Dilute solids flow and Solids washout, were identified based on the ratio of the maximum oscillatory axial velocity to hindered settling velocity of particles, input power per volume for oscillatory flow and the concentration ratio between adjacent cells. The results demonstrate that increasing frequency and/or amplitude decreases the axial dispersion of solids, the ratio of solids to fluid mean residence time and the solids holdup. Inlet solids concentration has no significant influence on the axial dispersion but considerably affects the solids mean residence time and the solids holdup.
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering and Processing-Process Intensification
T1  - Solids flow pattern in continuous oscillatory baffled reactor
EP  - 119
SP  - 108
VL  - 135
DO  - 10.1016/j.cep.2018.11.017
ER  - 

@article{
author = "Slavnić, Danijela and Bugarski, Branko and Nikačević, Nikola",
year = "2019",
abstract = "Transition from batch to continuous processing is an attractive alternative for the production of pharmaceutical, fine and bio chemicals. In a number of such industrial reactions or separations, a solid phase is present either as a reactant, product or catalyst. Instead of conventional continuous reactors, the utilization of oscillatory flow reactors could be advantageous. The flow pattern of solids in a continuous oscillatory baffled reactor (COBR), into which solids are introduced continuously, was investigated experimentally and theoretically. The effects of operating conditions on a solids flow regime, solids mean residence time and dispersion and solids holdup were analyzed and quantified. Four solids flow regimes named as: Creeping solids flow, Dense solids flow, Dilute solids flow and Solids washout, were identified based on the ratio of the maximum oscillatory axial velocity to hindered settling velocity of particles, input power per volume for oscillatory flow and the concentration ratio between adjacent cells. The results demonstrate that increasing frequency and/or amplitude decreases the axial dispersion of solids, the ratio of solids to fluid mean residence time and the solids holdup. Inlet solids concentration has no significant influence on the axial dispersion but considerably affects the solids mean residence time and the solids holdup.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering and Processing-Process Intensification",
title = "Solids flow pattern in continuous oscillatory baffled reactor",
pages = "119-108",
volume = "135",
doi = "10.1016/j.cep.2018.11.017"
}

Slavnić, D., Bugarski, B.,& Nikačević, N.. (2019). Solids flow pattern in continuous oscillatory baffled reactor. in Chemical Engineering and Processing-Process Intensification
Elsevier Science Sa, Lausanne., 135, 108-119.
https://doi.org/10.1016/j.cep.2018.11.017

Slavnić D, Bugarski B, Nikačević N. Solids flow pattern in continuous oscillatory baffled reactor. in Chemical Engineering and Processing-Process Intensification. 2019;135:108-119.
doi:10.1016/j.cep.2018.11.017 .

Slavnić, Danijela, Bugarski, Branko, Nikačević, Nikola, "Solids flow pattern in continuous oscillatory baffled reactor" in Chemical Engineering and Processing-Process Intensification, 135 (2019):108-119,
https://doi.org/10.1016/j.cep.2018.11.017 . .

TY  - CONF
AU  - Kovačina, Jovanka N.
AU  - Milošević, Milena D.
AU  - Božić, Aleksandra R.
AU  - Jovanović, Aleksandar
AU  - Marinković, Aleksandar
AU  - Onjia, Antonije
AU  - Povrenović, Dragan
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4171
AB  - Due to the development of industry and population growth during the in recent years, there are problems with wastewater from production that needs to be addressed in an environmentally and economical way. All wastewaters from industry, no matter how they are created, contain harmful substances that may have some degree of toxicity, must be treated if their quality does not meet the legal requirements. The purpose of wastewater treatment is to remove harmful substances, thereby reducing its pollution level, and at the same time, it also has a certain economic and environmental effect. Therefore, wastewater treatment was carried out in this work by precipitation using calcium oxide to remove colloidal substances and heavy metals. Most pollutants are of organic origin and their removal will be carried in this work out using advanced oxidation processes using ozone, and ozone in combination with ultrasound to achieve water quality that complies with the law. The purification process will be optimized with respect to, method, time and amount of oxidizing agent applied. The degree of pollution of water by organic compounds will be determined on the basis of measurements of HPK, BOD and the concentration of heavy metals (lead, ferrum, chromium, copper, zinc, aluminum).
AB  - Usled razvoja industrije i rastom populacije tokom poslednjih godina javljaju se problemi u vezi sa otpadnim vodama iz proizvodnje koje je neophodno rešavati na ekološki i ekonomičan način. Sve otpadne vode iz postrojenja bez obzira kako su nastale sadrže štetne materije koje mogu da imaju i određen stepen toksičnih primesa, moraju se prečistiti ako njihov kvalitet ne odgovara zakonskim okvirima. Svrha tretmana otpadnih voda je uklanjanje štetnih materija čime se postiže smanjnje stepena njene zagađenosti, a istovremeno se ostvaruje i određen ekonomski i ekološki efekat, stoga je u ovom radu izvršeno prečišćavanje otpadne vode postupkom taloženja upotrebom kalcijum-oksida u cilju uklanjanja koloidnih materija i teških metala. Većina zagađujućih materija su organskog porekla i njihovo ukljanjanje vršiće se primenom naprednih oksidacionih procesa korišćenjem ozona i ozona u kombinaciji sa ultrazvukom u cilju postizanja kvaliteta vode koji odgovara zakonskoj regulativi. Proces prečišćavanja će se optimizovati u odnosu na tehnološki postupak, koncentraciju, vreme tretmana i količinu primenjenog oksidacionog sredstva. Stepen zagađenosti vode organskim jedinjenjima će se određivati na osnovu merenja HPK, BPK i koncentracije teških metala (olovo, gvožđe, hrom, bakar, cink, aluminijum).
PB  - Beograd : Beogradska politehnika
C3  - Zbornik radova - Peti naučno-stručni skup politehnika
T1  - Purification of waste water using ozonization
T1  - Prečišćavanje otpadnih voda primenom ozonizacije
EP  - 147
SP  - 142
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4171
ER  - 

@conference{
author = "Kovačina, Jovanka N. and Milošević, Milena D. and Božić, Aleksandra R. and Jovanović, Aleksandar and Marinković, Aleksandar and Onjia, Antonije and Povrenović, Dragan",
year = "2019",
abstract = "Due to the development of industry and population growth during the in recent years, there are problems with wastewater from production that needs to be addressed in an environmentally and economical way. All wastewaters from industry, no matter how they are created, contain harmful substances that may have some degree of toxicity, must be treated if their quality does not meet the legal requirements. The purpose of wastewater treatment is to remove harmful substances, thereby reducing its pollution level, and at the same time, it also has a certain economic and environmental effect. Therefore, wastewater treatment was carried out in this work by precipitation using calcium oxide to remove colloidal substances and heavy metals. Most pollutants are of organic origin and their removal will be carried in this work out using advanced oxidation processes using ozone, and ozone in combination with ultrasound to achieve water quality that complies with the law. The purification process will be optimized with respect to, method, time and amount of oxidizing agent applied. The degree of pollution of water by organic compounds will be determined on the basis of measurements of HPK, BOD and the concentration of heavy metals (lead, ferrum, chromium, copper, zinc, aluminum)., Usled razvoja industrije i rastom populacije tokom poslednjih godina javljaju se problemi u vezi sa otpadnim vodama iz proizvodnje koje je neophodno rešavati na ekološki i ekonomičan način. Sve otpadne vode iz postrojenja bez obzira kako su nastale sadrže štetne materije koje mogu da imaju i određen stepen toksičnih primesa, moraju se prečistiti ako njihov kvalitet ne odgovara zakonskim okvirima. Svrha tretmana otpadnih voda je uklanjanje štetnih materija čime se postiže smanjnje stepena njene zagađenosti, a istovremeno se ostvaruje i određen ekonomski i ekološki efekat, stoga je u ovom radu izvršeno prečišćavanje otpadne vode postupkom taloženja upotrebom kalcijum-oksida u cilju uklanjanja koloidnih materija i teških metala. Većina zagađujućih materija su organskog porekla i njihovo ukljanjanje vršiće se primenom naprednih oksidacionih procesa korišćenjem ozona i ozona u kombinaciji sa ultrazvukom u cilju postizanja kvaliteta vode koji odgovara zakonskoj regulativi. Proces prečišćavanja će se optimizovati u odnosu na tehnološki postupak, koncentraciju, vreme tretmana i količinu primenjenog oksidacionog sredstva. Stepen zagađenosti vode organskim jedinjenjima će se određivati na osnovu merenja HPK, BPK i koncentracije teških metala (olovo, gvožđe, hrom, bakar, cink, aluminijum).",
publisher = "Beograd : Beogradska politehnika",
journal = "Zbornik radova - Peti naučno-stručni skup politehnika",
title = "Purification of waste water using ozonization, Prečišćavanje otpadnih voda primenom ozonizacije",
pages = "147-142",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4171"
}

Kovačina, J. N., Milošević, M. D., Božić, A. R., Jovanović, A., Marinković, A., Onjia, A.,& Povrenović, D.. (2019). Purification of waste water using ozonization. in Zbornik radova - Peti naučno-stručni skup politehnika
Beograd : Beogradska politehnika., 142-147.
https://hdl.handle.net/21.15107/rcub_technorep_4171

Kovačina JN, Milošević MD, Božić AR, Jovanović A, Marinković A, Onjia A, Povrenović D. Purification of waste water using ozonization. in Zbornik radova - Peti naučno-stručni skup politehnika. 2019;:142-147.
https://hdl.handle.net/21.15107/rcub_technorep_4171 .

Kovačina, Jovanka N., Milošević, Milena D., Božić, Aleksandra R., Jovanović, Aleksandar, Marinković, Aleksandar, Onjia, Antonije, Povrenović, Dragan, "Purification of waste water using ozonization" in Zbornik radova - Peti naučno-stručni skup politehnika (2019):142-147,
https://hdl.handle.net/21.15107/rcub_technorep_4171 .

TY  - CONF
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4190
AB  - In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution .
AB  - U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.
PB  - Serbian Chemical Society, Belgrade
C3  - 56th Meeting of the Serbian chemical Society - Proceedings
T1  - Investigation of the dynamics of fluidized bed granulation process
T1  - Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju
EP  - 59
SP  - 55
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4190
ER  - 

@conference{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution ., U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "56th Meeting of the Serbian chemical Society - Proceedings",
title = "Investigation of the dynamics of fluidized bed granulation process, Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju",
pages = "59-55",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4190"
}

Kaluđerović-Radoičić, T., Đuriš, M., Jaćimovski, D.,& Arsenijević, Z.. (2019). Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Proceedings
Serbian Chemical Society, Belgrade., 55-59.
https://hdl.handle.net/21.15107/rcub_technorep_4190

Kaluđerović-Radoičić T, Đuriš M, Jaćimovski D, Arsenijević Z. Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Proceedings. 2019;:55-59.
https://hdl.handle.net/21.15107/rcub_technorep_4190 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Jaćimovski, Darko, Arsenijević, Zorana, "Investigation of the dynamics of fluidized bed granulation process" in 56th Meeting of the Serbian chemical Society - Proceedings (2019):55-59,
https://hdl.handle.net/21.15107/rcub_technorep_4190 .

TY  - JOUR
AU  - Brzić, Danica
AU  - Petkovska, Menka
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4211
AB  - In the present paper, the Nonlinear Frequency Response (NFR) analysis is applied for theoretical study of kinetics of adsorption governed by pore-surface diffusion. The concept of higher-order frequency response functions (FRFs) is used. Based on a nonlinear mathematical model for adsorption of pure gas and spherical adsorbent particles, the theoretical first-and second-order FRFs, which relate the adsorbate concentration in the particle to the surrounding pressure (F-1 (omega) and F-2 (omega,omega)), have been derived. The obtained FRFs have been simulated for different steady-state pressures and different ratios (between zero and one) of surface to pore diffusion coefficients. The results show that, unlike F-1 (omega), F-2 (omega,omega) exhibits features which unambiguously distinguish the pore-surface diffusion model from pure pore diffusion and micropore diffusion. Based on the characteristic features of F-1 (omega) and F-2 (omega,omega), a new methodology for direct estimation of the separate values of the pore and surface diffusion coefficients has been established.
PB  - Hindawi Ltd, London
T2  - Mathematical Problems in Engineering
T1  - Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control
VL  - 2019
DO  - 10.1155/2019/7932967
ER  - 

@article{
author = "Brzić, Danica and Petkovska, Menka",
year = "2019",
abstract = "In the present paper, the Nonlinear Frequency Response (NFR) analysis is applied for theoretical study of kinetics of adsorption governed by pore-surface diffusion. The concept of higher-order frequency response functions (FRFs) is used. Based on a nonlinear mathematical model for adsorption of pure gas and spherical adsorbent particles, the theoretical first-and second-order FRFs, which relate the adsorbate concentration in the particle to the surrounding pressure (F-1 (omega) and F-2 (omega,omega)), have been derived. The obtained FRFs have been simulated for different steady-state pressures and different ratios (between zero and one) of surface to pore diffusion coefficients. The results show that, unlike F-1 (omega), F-2 (omega,omega) exhibits features which unambiguously distinguish the pore-surface diffusion model from pure pore diffusion and micropore diffusion. Based on the characteristic features of F-1 (omega) and F-2 (omega,omega), a new methodology for direct estimation of the separate values of the pore and surface diffusion coefficients has been established.",
publisher = "Hindawi Ltd, London",
journal = "Mathematical Problems in Engineering",
title = "Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control",
volume = "2019",
doi = "10.1155/2019/7932967"
}

Brzić, D.,& Petkovska, M.. (2019). Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control. in Mathematical Problems in Engineering
Hindawi Ltd, London., 2019.
https://doi.org/10.1155/2019/7932967

Brzić D, Petkovska M. Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control. in Mathematical Problems in Engineering. 2019;2019.
doi:10.1155/2019/7932967 .

Brzić, Danica, Petkovska, Menka, "Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control" in Mathematical Problems in Engineering, 2019 (2019),
https://doi.org/10.1155/2019/7932967 . .

TY  - JOUR
AU  - Kandaswamy, Saikrishnan
AU  - Sorrentino, Antonio
AU  - Borate, Shivangi
AU  - Živković, Luka
AU  - Petkovska, Menka
AU  - Vidaković-Koch, Tanja
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4078
AB  - Oxygen reduction reaction (ORR) was studied on a silver polycrystalline electrode in different NaOH concentrations with a help of rotating disc and rotating ring disc electrodes. Soluble reaction intermediate was detected at all alkaline concentrations, but its concentration increased with an increase of the level of impurities. ORR is not NaOH concentration dependent at low concentrations (0.1 and 1 M). In 11 M NaOH ORR onsets at more positive potentials in the region where underpotential silver oxide formation shows less reversible behaviour. The nonlinear frequency response analysis spectra show significant qualitative difference with NaOH concentration indicating a high capability of this method for kinetic mechanism investigations.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Oxygen reduction reaction on silver electrodes under strong alkaline conditions
VL  - 320
DO  - 10.1016/j.electacta.2019.07.028
ER  - 

@article{
author = "Kandaswamy, Saikrishnan and Sorrentino, Antonio and Borate, Shivangi and Živković, Luka and Petkovska, Menka and Vidaković-Koch, Tanja",
year = "2019",
abstract = "Oxygen reduction reaction (ORR) was studied on a silver polycrystalline electrode in different NaOH concentrations with a help of rotating disc and rotating ring disc electrodes. Soluble reaction intermediate was detected at all alkaline concentrations, but its concentration increased with an increase of the level of impurities. ORR is not NaOH concentration dependent at low concentrations (0.1 and 1 M). In 11 M NaOH ORR onsets at more positive potentials in the region where underpotential silver oxide formation shows less reversible behaviour. The nonlinear frequency response analysis spectra show significant qualitative difference with NaOH concentration indicating a high capability of this method for kinetic mechanism investigations.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Oxygen reduction reaction on silver electrodes under strong alkaline conditions",
volume = "320",
doi = "10.1016/j.electacta.2019.07.028"
}

Kandaswamy, S., Sorrentino, A., Borate, S., Živković, L., Petkovska, M.,& Vidaković-Koch, T.. (2019). Oxygen reduction reaction on silver electrodes under strong alkaline conditions. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 320.
https://doi.org/10.1016/j.electacta.2019.07.028

Kandaswamy S, Sorrentino A, Borate S, Živković L, Petkovska M, Vidaković-Koch T. Oxygen reduction reaction on silver electrodes under strong alkaline conditions. in Electrochimica Acta. 2019;320.
doi:10.1016/j.electacta.2019.07.028 .

Kandaswamy, Saikrishnan, Sorrentino, Antonio, Borate, Shivangi, Živković, Luka, Petkovska, Menka, Vidaković-Koch, Tanja, "Oxygen reduction reaction on silver electrodes under strong alkaline conditions" in Electrochimica Acta, 320 (2019),
https://doi.org/10.1016/j.electacta.2019.07.028 . .

TY  - CONF
AU  - Felischak, Matthias
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Hamel, Christof
AU  - Seidel-Morgenstern, Andreas
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4152
AB  - The classical design of continuous chemical reactors exploits steady-state operation, which is optimized and maintained by appropriate control systems. Nevertheless, it is well-known that the reactor performance can be enhanced by applying periodic regimes, like forced modulations of input parameters.The identification and evaluation of suitable periodic operation conditions is challenging. One approach that can be used is based on nonlinear frequency response (NFR) analysis. The focus of this work is the experimental analysis of shapes for two simultaneously imposed modulations (sinusoidal and square) in comparison to results predicted by the NFR method. The acetic anhydride hydrolysis was studied in an adiabatic CSTR exploiting a periodic operation mode, which was found to be superior to the corresponding steady-state operation.
C3  - German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany
T1  - Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4152
ER  - 

@conference{
author = "Felischak, Matthias and Nikolić, Daliborka and Petkovska, Menka and Hamel, Christof and Seidel-Morgenstern, Andreas",
year = "2019",
abstract = "The classical design of continuous chemical reactors exploits steady-state operation, which is optimized and maintained by appropriate control systems. Nevertheless, it is well-known that the reactor performance can be enhanced by applying periodic regimes, like forced modulations of input parameters.The identification and evaluation of suitable periodic operation conditions is challenging. One approach that can be used is based on nonlinear frequency response (NFR) analysis. The focus of this work is the experimental analysis of shapes for two simultaneously imposed modulations (sinusoidal and square) in comparison to results predicted by the NFR method. The acetic anhydride hydrolysis was studied in an adiabatic CSTR exploiting a periodic operation mode, which was found to be superior to the corresponding steady-state operation.",
journal = "German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany",
title = "Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4152"
}

Felischak, M., Nikolić, D., Petkovska, M., Hamel, C.,& Seidel-Morgenstern, A.. (2019). Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations. in German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany.
https://hdl.handle.net/21.15107/rcub_technorep_4152

Felischak M, Nikolić D, Petkovska M, Hamel C, Seidel-Morgenstern A. Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations. in German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany. 2019;.
https://hdl.handle.net/21.15107/rcub_technorep_4152 .

Felischak, Matthias, Nikolić, Daliborka, Petkovska, Menka, Hamel, Christof, Seidel-Morgenstern, Andreas, "Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations" in German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany (2019),
https://hdl.handle.net/21.15107/rcub_technorep_4152 .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4083
AB  - In this paper, an innovative fluidized bed dryer with inert particles is presented. The system can be used for drying of solutions, suspensions and pastes in order to obtain a powdered product. The experiments were performed in a pilot-scale dryer with a cylindrical column 0.215 m in diameter and 1.2 mm height, with glass spheres as inert particles. The material used for drying was CuSO4 solution. The effects of operating conditions on the dryer throughput and product quality were investigated. Main performance criteria, i.e. specific water evaporation rate, specific heat consumption and specific air consumption, were quantified. Nearly isothermal conditions were found due to thorough mixing of the particles. The energy efficiency of the dryer was also assessed. Simple heat and mass balances predicted the dryer performance quite well.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles
EP  - 222
IS  - 4
SP  - 213
VL  - 73
DO  - 10.2298/HEMIND190626021D
ER  - 

@article{
author = "Đuriš, Mihal and Kaluđerović-Radoičić, Tatjana and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, an innovative fluidized bed dryer with inert particles is presented. The system can be used for drying of solutions, suspensions and pastes in order to obtain a powdered product. The experiments were performed in a pilot-scale dryer with a cylindrical column 0.215 m in diameter and 1.2 mm height, with glass spheres as inert particles. The material used for drying was CuSO4 solution. The effects of operating conditions on the dryer throughput and product quality were investigated. Main performance criteria, i.e. specific water evaporation rate, specific heat consumption and specific air consumption, were quantified. Nearly isothermal conditions were found due to thorough mixing of the particles. The energy efficiency of the dryer was also assessed. Simple heat and mass balances predicted the dryer performance quite well.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles",
pages = "222-213",
number = "4",
volume = "73",
doi = "10.2298/HEMIND190626021D"
}

Đuriš, M., Kaluđerović-Radoičić, T., Jaćimovski, D.,& Arsenijević, Z.. (2019). High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 73(4), 213-222.
https://doi.org/10.2298/HEMIND190626021D

Đuriš M, Kaluđerović-Radoičić T, Jaćimovski D, Arsenijević Z. High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles. in Hemijska industrija. 2019;73(4):213-222.
doi:10.2298/HEMIND190626021D .

Đuriš, Mihal, Kaluđerović-Radoičić, Tatjana, Jaćimovski, Darko, Arsenijević, Zorana, "High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles" in Hemijska industrija, 73, no. 4 (2019):213-222,
https://doi.org/10.2298/HEMIND190626021D . .

TY  - JOUR
AU  - Đeković-Šević, Milica
AU  - Bošković-Vragolović, Nevenka
AU  - Garić-Grulović, Radmila
AU  - Pejanović, Srđan
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3967
AB  - This work deals with gas absorption accompanied by chemical reaction in a liquid phase. Ozone absorption in potassium indigotrisulfonate solution was investigated in a batch bubble column. Enhancement factor for absorption accompanied by instantaneous chemical reaction in the liquid phase was experimentally determined, as a ratio of the volumetric mass transfer coefficient for the absorption accompanied by reaction to that for pure physical absorption. The influence of (a) the initial concentration of the solute from liquid phase and (b) the ozone concentration in gas phase on the enhancement factor were experimentally examined. The absorption accompanied by instantaneous chemical reaction is a diffusion-controlled process, whose rate depends upon the diffusivities of the absorbing gas and the solute in liquid phase. The influence of these diffusivities was found to be more significant for lower values of the enhancement factor. The rate of ozone absorption was followed by the time change of the solution color, using new method based on the computer program SigmaScan Pro 5 (Systat Software, Inc., San Jose, CA, USA). This investigation is a contribution to the prediction of the ozone consumption in wastewater treatment, in cases when ozone instantaneously reacts with substances present in water.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Chemical Engineering Communications
T1  - Experimental study on the ozone absorption accompanied by instantaneous chemical reaction
EP  - 580
IS  - 5
SP  - 571
VL  - 205
DO  - 10.1080/00986445.2017.1399125
ER  - 

@article{
author = "Đeković-Šević, Milica and Bošković-Vragolović, Nevenka and Garić-Grulović, Radmila and Pejanović, Srđan",
year = "2018",
abstract = "This work deals with gas absorption accompanied by chemical reaction in a liquid phase. Ozone absorption in potassium indigotrisulfonate solution was investigated in a batch bubble column. Enhancement factor for absorption accompanied by instantaneous chemical reaction in the liquid phase was experimentally determined, as a ratio of the volumetric mass transfer coefficient for the absorption accompanied by reaction to that for pure physical absorption. The influence of (a) the initial concentration of the solute from liquid phase and (b) the ozone concentration in gas phase on the enhancement factor were experimentally examined. The absorption accompanied by instantaneous chemical reaction is a diffusion-controlled process, whose rate depends upon the diffusivities of the absorbing gas and the solute in liquid phase. The influence of these diffusivities was found to be more significant for lower values of the enhancement factor. The rate of ozone absorption was followed by the time change of the solution color, using new method based on the computer program SigmaScan Pro 5 (Systat Software, Inc., San Jose, CA, USA). This investigation is a contribution to the prediction of the ozone consumption in wastewater treatment, in cases when ozone instantaneously reacts with substances present in water.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Chemical Engineering Communications",
title = "Experimental study on the ozone absorption accompanied by instantaneous chemical reaction",
pages = "580-571",
number = "5",
volume = "205",
doi = "10.1080/00986445.2017.1399125"
}

Đeković-Šević, M., Bošković-Vragolović, N., Garić-Grulović, R.,& Pejanović, S.. (2018). Experimental study on the ozone absorption accompanied by instantaneous chemical reaction. in Chemical Engineering Communications
Taylor & Francis Inc, Philadelphia., 205(5), 571-580.
https://doi.org/10.1080/00986445.2017.1399125

Đeković-Šević M, Bošković-Vragolović N, Garić-Grulović R, Pejanović S. Experimental study on the ozone absorption accompanied by instantaneous chemical reaction. in Chemical Engineering Communications. 2018;205(5):571-580.
doi:10.1080/00986445.2017.1399125 .

Đeković-Šević, Milica, Bošković-Vragolović, Nevenka, Garić-Grulović, Radmila, Pejanović, Srđan, "Experimental study on the ozone absorption accompanied by instantaneous chemical reaction" in Chemical Engineering Communications, 205, no. 5 (2018):571-580,
https://doi.org/10.1080/00986445.2017.1399125 . .

TY  - JOUR
AU  - Currie, Robert
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Simakov, David
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3788
AB  - Nonlinear frequency response (NFR) analysis was applied on a Sabatier reactor. A substantial improvement in CO2 conversion was predicted under certain conditions. The NFR analysis prediction was validated using a kinetic flow reactor model. A comprehensive packed bed model was analyzed using NFR as a guidance.
T2  - The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy
T1  - CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study
SP  - P52
DO  - 10.1002/ijch.201700134
ER  - 

@article{
author = "Currie, Robert and Nikolić, Daliborka and Petkovska, Menka and Simakov, David",
year = "2018",
abstract = "Nonlinear frequency response (NFR) analysis was applied on a Sabatier reactor. A substantial improvement in CO2 conversion was predicted under certain conditions. The NFR analysis prediction was validated using a kinetic flow reactor model. A comprehensive packed bed model was analyzed using NFR as a guidance.",
journal = "The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy",
title = "CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study",
pages = "P52",
doi = "10.1002/ijch.201700134"
}

Currie, R., Nikolić, D., Petkovska, M.,& Simakov, D.. (2018). CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study. in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy, P52.
https://doi.org/10.1002/ijch.201700134

Currie R, Nikolić D, Petkovska M, Simakov D. CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study. in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy. 2018;:P52.
doi:10.1002/ijch.201700134 .

Currie, Robert, Nikolić, Daliborka, Petkovska, Menka, Simakov, David, "CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study" in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy (2018):P52,
https://doi.org/10.1002/ijch.201700134 . .

TY  - CONF
AU  - Felischak, Matthias
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Seidel-Morgenstern, Andreas
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3763
AB  - Theoretical evaluation of possible reactor improvement for periodic operation. Automated experimental setup was built, with a lab-scale CSTR and adjustable flow-rates, in which periodic operations can be conducted. The concept was implemented for the hydrolysis of acetic anhydride as a model reaction.
C3  - The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy
T1  - Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3763
ER  - 

@conference{
author = "Felischak, Matthias and Nikolić, Daliborka and Petkovska, Menka and Seidel-Morgenstern, Andreas",
year = "2018",
abstract = "Theoretical evaluation of possible reactor improvement for periodic operation. Automated experimental setup was built, with a lab-scale CSTR and adjustable flow-rates, in which periodic operations can be conducted. The concept was implemented for the hydrolysis of acetic anhydride as a model reaction.",
journal = "The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy",
title = "Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3763"
}

Felischak, M., Nikolić, D., Petkovska, M.,& Seidel-Morgenstern, A.. (2018). Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis. in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy.
https://hdl.handle.net/21.15107/rcub_technorep_3763

Felischak M, Nikolić D, Petkovska M, Seidel-Morgenstern A. Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis. in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy. 2018;.
https://hdl.handle.net/21.15107/rcub_technorep_3763 .

Felischak, Matthias, Nikolić, Daliborka, Petkovska, Menka, Seidel-Morgenstern, Andreas, "Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis" in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy (2018),
https://hdl.handle.net/21.15107/rcub_technorep_3763 .

TY  - JOUR
AU  - Petkovska, Menka
AU  - Nikolić-Paunić, Daliborka
AU  - Seidel-Morgenstern, Andreas
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3878
AB  - Nonlinear Frequency Response (NFR) method is a relatively new method which can be used for fast evaluation of possible process improvements through periodic operations. The method is analytical and approximate. Its main task is to give an answer whether periodic modulation of one or more process inputs can result in improved process performance. The method is explained in brief and an overview of the existing applications is given. The review covers simple reactions performed in isothermal and non-isothermal stirred tank reactors exposed to different modulated inputs (inlet concentration, flow-rate, inlet temperature, temperature of the heating/cooling medium). Processes with two simultaneously modulated inputs and different shapes of the periodic input are also considered. The results of the NFR method are compared with the results of numerical simulation and a critical evaluation of the method is given.
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Israel Journal of Chemistry
T1  - Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors
EP  - 681
IS  - 6-7
SP  - 663
VL  - 58
DO  - 10.1002/ijch.201700132
ER  - 

@article{
author = "Petkovska, Menka and Nikolić-Paunić, Daliborka and Seidel-Morgenstern, Andreas",
year = "2018",
abstract = "Nonlinear Frequency Response (NFR) method is a relatively new method which can be used for fast evaluation of possible process improvements through periodic operations. The method is analytical and approximate. Its main task is to give an answer whether periodic modulation of one or more process inputs can result in improved process performance. The method is explained in brief and an overview of the existing applications is given. The review covers simple reactions performed in isothermal and non-isothermal stirred tank reactors exposed to different modulated inputs (inlet concentration, flow-rate, inlet temperature, temperature of the heating/cooling medium). Processes with two simultaneously modulated inputs and different shapes of the periodic input are also considered. The results of the NFR method are compared with the results of numerical simulation and a critical evaluation of the method is given.",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Israel Journal of Chemistry",
title = "Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors",
pages = "681-663",
number = "6-7",
volume = "58",
doi = "10.1002/ijch.201700132"
}

Petkovska, M., Nikolić-Paunić, D.,& Seidel-Morgenstern, A.. (2018). Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors. in Israel Journal of Chemistry
Wiley-VCH Verlag Gmbh, Weinheim., 58(6-7), 663-681.
https://doi.org/10.1002/ijch.201700132

Petkovska M, Nikolić-Paunić D, Seidel-Morgenstern A. Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors. in Israel Journal of Chemistry. 2018;58(6-7):663-681.
doi:10.1002/ijch.201700132 .

Petkovska, Menka, Nikolić-Paunić, Daliborka, Seidel-Morgenstern, Andreas, "Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors" in Israel Journal of Chemistry, 58, no. 6-7 (2018):663-681,
https://doi.org/10.1002/ijch.201700132 . .

TY  - CONF
AU  - Felischak, Matthias
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Seidel-Morgenstern, Andreas
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3787
AB  - The classical design of continuously operated chemical reactors assumes that they are operated in a steady-state which is usually optimized and maintained by using appropriate control systems. Nevertheless, it has been known for quite some time that, in some cases, better performance can be achieved by applying a periodic regime exploiting forced modulations of one or more inputs to the reactor [1,2]. Finding out whether, at which conditions and to which extent periodic operation can be superior to the optimal steady-state is difficult. One approach that can be used is an approximate, analytical method called nonlinear frequency response (NFR) method [3].  The NFR method is based on the concept of higher order frequency response functions (FRFs) and applicable for weakly nonlinear systems [3]. Frequency response of a weakly nonlinear system, in addition to the basic harmonic, contains a non-periodic (DC) term and, theoretically, an infinite sequence of higher harmonics. The DC component of the output is responsible for the average performance of the periodically operated reactor, and its sign and value define whether, and to which extent, the periodic operation leads to process improvement. Using the NFR method, this DC component can be approximately estimated from a single asymmetrical second order FRF (for modulation of a single input) or from several single input and cross- asymmetrical second order FRFs (for multiple-input modulation). For the case of multiple modulated inputs, the optimal phase difference between the modulated inputs, which is an essential parameter, can be directly determined [4,5]. Promising parameters to be periodically modulated separately or simultaneously are clearly the reactant inlet concentrations, the flow-rates and the feed temperatures.   We used the NFR method in order to identify forced periodic conditions under which the acetic acid anhydride hydrolysis (chosen as a test reaction) can be favorably performed in a CSTR. Based on the results of the theoretical analysis, experimental investigations were performed using a lab-scale reactor exposed to two fluctuating inlet streams (water and acetic anhydride) with adjustable flow-rates, which enables modulation of the inlet reactant concentrations or/and total flow-rates in a flexible manner. The concentration of the acetic acid formed is measured in the reactor online and used to monitor the process dynamics. Averaged values of the product outlet stream serve to validate the mean values predicted by NFR analysis and to evaluate the potential of this flexible forcing strategy.
C3  - American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA
T1  - Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3787
ER  - 

@conference{
author = "Felischak, Matthias and Nikolić, Daliborka and Petkovska, Menka and Seidel-Morgenstern, Andreas",
year = "2018",
abstract = "The classical design of continuously operated chemical reactors assumes that they are operated in a steady-state which is usually optimized and maintained by using appropriate control systems. Nevertheless, it has been known for quite some time that, in some cases, better performance can be achieved by applying a periodic regime exploiting forced modulations of one or more inputs to the reactor [1,2]. Finding out whether, at which conditions and to which extent periodic operation can be superior to the optimal steady-state is difficult. One approach that can be used is an approximate, analytical method called nonlinear frequency response (NFR) method [3].  The NFR method is based on the concept of higher order frequency response functions (FRFs) and applicable for weakly nonlinear systems [3]. Frequency response of a weakly nonlinear system, in addition to the basic harmonic, contains a non-periodic (DC) term and, theoretically, an infinite sequence of higher harmonics. The DC component of the output is responsible for the average performance of the periodically operated reactor, and its sign and value define whether, and to which extent, the periodic operation leads to process improvement. Using the NFR method, this DC component can be approximately estimated from a single asymmetrical second order FRF (for modulation of a single input) or from several single input and cross- asymmetrical second order FRFs (for multiple-input modulation). For the case of multiple modulated inputs, the optimal phase difference between the modulated inputs, which is an essential parameter, can be directly determined [4,5]. Promising parameters to be periodically modulated separately or simultaneously are clearly the reactant inlet concentrations, the flow-rates and the feed temperatures.   We used the NFR method in order to identify forced periodic conditions under which the acetic acid anhydride hydrolysis (chosen as a test reaction) can be favorably performed in a CSTR. Based on the results of the theoretical analysis, experimental investigations were performed using a lab-scale reactor exposed to two fluctuating inlet streams (water and acetic anhydride) with adjustable flow-rates, which enables modulation of the inlet reactant concentrations or/and total flow-rates in a flexible manner. The concentration of the acetic acid formed is measured in the reactor online and used to monitor the process dynamics. Averaged values of the product outlet stream serve to validate the mean values predicted by NFR analysis and to evaluate the potential of this flexible forcing strategy.",
journal = "American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA",
title = "Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3787"
}

Felischak, M., Nikolić, D., Petkovska, M.,& Seidel-Morgenstern, A.. (2018). Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration. in American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA.
https://hdl.handle.net/21.15107/rcub_technorep_3787

Felischak M, Nikolić D, Petkovska M, Seidel-Morgenstern A. Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration. in American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA. 2018;.
https://hdl.handle.net/21.15107/rcub_technorep_3787 .

Felischak, Matthias, Nikolić, Daliborka, Petkovska, Menka, Seidel-Morgenstern, Andreas, "Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration" in American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA (2018),
https://hdl.handle.net/21.15107/rcub_technorep_3787 .

TY  - JOUR
AU  - Currie, Robert
AU  - Nikolić-Paunić, Daliborka
AU  - Petkovska, Menka
AU  - Simakov, David
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3875
AB  - Conversion of CO2 into synthetic CH4 via thermocatalytic hydrogenation (the Sabatier reaction), has recently gained increasing interest as a possible route for CO2 utilization and energy storage pathway. Herein, we analyze the possibility of increasing the CO2 conversion through periodic operation of the reactor. The analysis is performed by using the Nonlinear Frequency Response (NFR) method, a recently developed analytical technique, suitable for fast evaluation of periodic reactor operations. The NFR analysis predicts a significant conversion gain (up to 50%) for certain frequencies of the feed flow rate modulation. This prediction is validated by numerical simulations with a reaction rate expression obtained by CO2 conversion experiments using a Ni/Al2O3 catalysts. Both the NFR analysis and numerical simulations predict that it is possible to obtain 70% CO2 conversion at 500 K, 5 bar, and average space velocity of 7600 h(-1) by a periodic modulation of the feed flow rate, as compared to the corresponding steady state CO2 conversion of 43%.
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Israel Journal of Chemistry
T1  - CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study
EP  - 775
IS  - 6-7
SP  - 762
VL  - 58
DO  - 10.1002/ijch.201700134
ER  - 

@article{
author = "Currie, Robert and Nikolić-Paunić, Daliborka and Petkovska, Menka and Simakov, David",
year = "2018",
abstract = "Conversion of CO2 into synthetic CH4 via thermocatalytic hydrogenation (the Sabatier reaction), has recently gained increasing interest as a possible route for CO2 utilization and energy storage pathway. Herein, we analyze the possibility of increasing the CO2 conversion through periodic operation of the reactor. The analysis is performed by using the Nonlinear Frequency Response (NFR) method, a recently developed analytical technique, suitable for fast evaluation of periodic reactor operations. The NFR analysis predicts a significant conversion gain (up to 50%) for certain frequencies of the feed flow rate modulation. This prediction is validated by numerical simulations with a reaction rate expression obtained by CO2 conversion experiments using a Ni/Al2O3 catalysts. Both the NFR analysis and numerical simulations predict that it is possible to obtain 70% CO2 conversion at 500 K, 5 bar, and average space velocity of 7600 h(-1) by a periodic modulation of the feed flow rate, as compared to the corresponding steady state CO2 conversion of 43%.",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Israel Journal of Chemistry",
title = "CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study",
pages = "775-762",
number = "6-7",
volume = "58",
doi = "10.1002/ijch.201700134"
}

Currie, R., Nikolić-Paunić, D., Petkovska, M.,& Simakov, D.. (2018). CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study. in Israel Journal of Chemistry
Wiley-VCH Verlag Gmbh, Weinheim., 58(6-7), 762-775.
https://doi.org/10.1002/ijch.201700134

Currie R, Nikolić-Paunić D, Petkovska M, Simakov D. CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study. in Israel Journal of Chemistry. 2018;58(6-7):762-775.
doi:10.1002/ijch.201700134 .

Currie, Robert, Nikolić-Paunić, Daliborka, Petkovska, Menka, Simakov, David, "CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study" in Israel Journal of Chemistry, 58, no. 6-7 (2018):762-775,
https://doi.org/10.1002/ijch.201700134 . .

TY  - JOUR
AU  - Slavnić, Danijela
AU  - Živković, Luka
AU  - Bjelić, Ana V.
AU  - Bugarski, Branko
AU  - Nikačević, Nikola
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3624
AB  - BACKGROUND: Oscillatory baffled reactors have good prospect for use in batch to continuous transition for many industries. For reliable design and scale up it is essential to mathematically describe mixing and flow pattern of oscillatory flow. The aim of this study is to investigate the effects of operating conditions on residence time distribution (RTD) of liquid phase in a continuous oscillatory baffled reactor (COBR) and to propose a correlation that accurately describes the flow pattern. RESULTS: Analysis of results obtained for a wide variety of operating conditions in two geometrically similar reactors show that increase of oscillation frequency and amplitude both decrease axial dispersion, with a more prominent effect of amplitude. Proposed power-law correlation is in very good agreement with all performed experiments. Peclet numbers predicted by this correlation are in reasonably good agreement with the literature experimental data and is much better than the ones obtained by the commonly used correlation, which contains more fitting parameters. CONCLUSION: Results show that relatively high amplitudes, low frequencies and low to moderate secondary non-oscillatory flow should be used to ensure effective mixing with a low net flow in COBR. Developed correlation offers a simple, yet reliable way to predict the macroscopic flow pattern of liquid in COBR.
PB  - Wiley, Hoboken
T2  - Journal of Chemical Technology and Biotechnology
T1  - Residence time distribution and Peclet number correlation for continuous oscillatory flow reactors
EP  - 2188
IS  - 8
SP  - 2178
VL  - 92
DO  - 10.1002/jctb.5242
ER  - 

@article{
author = "Slavnić, Danijela and Živković, Luka and Bjelić, Ana V. and Bugarski, Branko and Nikačević, Nikola",
year = "2017",
abstract = "BACKGROUND: Oscillatory baffled reactors have good prospect for use in batch to continuous transition for many industries. For reliable design and scale up it is essential to mathematically describe mixing and flow pattern of oscillatory flow. The aim of this study is to investigate the effects of operating conditions on residence time distribution (RTD) of liquid phase in a continuous oscillatory baffled reactor (COBR) and to propose a correlation that accurately describes the flow pattern. RESULTS: Analysis of results obtained for a wide variety of operating conditions in two geometrically similar reactors show that increase of oscillation frequency and amplitude both decrease axial dispersion, with a more prominent effect of amplitude. Proposed power-law correlation is in very good agreement with all performed experiments. Peclet numbers predicted by this correlation are in reasonably good agreement with the literature experimental data and is much better than the ones obtained by the commonly used correlation, which contains more fitting parameters. CONCLUSION: Results show that relatively high amplitudes, low frequencies and low to moderate secondary non-oscillatory flow should be used to ensure effective mixing with a low net flow in COBR. Developed correlation offers a simple, yet reliable way to predict the macroscopic flow pattern of liquid in COBR.",
publisher = "Wiley, Hoboken",
journal = "Journal of Chemical Technology and Biotechnology",
title = "Residence time distribution and Peclet number correlation for continuous oscillatory flow reactors",
pages = "2188-2178",
number = "8",
volume = "92",
doi = "10.1002/jctb.5242"
}

Slavnić, D., Živković, L., Bjelić, A. V., Bugarski, B.,& Nikačević, N.. (2017). Residence time distribution and Peclet number correlation for continuous oscillatory flow reactors. in Journal of Chemical Technology and Biotechnology
Wiley, Hoboken., 92(8), 2178-2188.
https://doi.org/10.1002/jctb.5242

Slavnić D, Živković L, Bjelić AV, Bugarski B, Nikačević N. Residence time distribution and Peclet number correlation for continuous oscillatory flow reactors. in Journal of Chemical Technology and Biotechnology. 2017;92(8):2178-2188.
doi:10.1002/jctb.5242 .

Slavnić, Danijela, Živković, Luka, Bjelić, Ana V., Bugarski, Branko, Nikačević, Nikola, "Residence time distribution and Peclet number correlation for continuous oscillatory flow reactors" in Journal of Chemical Technology and Biotechnology, 92, no. 8 (2017):2178-2188,
https://doi.org/10.1002/jctb.5242 . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Bošković-Vragolović, Nevenka
AU  - Garić-Grulović, Radmila
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3713
AB  - The aim of this work was the experimental evaluation of different friction factor correlations for water flow through packed beds of spherical and non-spherical particles at ambient temperature. The experiments were performed by measuring the pressure drop across the bed. Packed beds made of monosized glass spherical particles of seven different diameters were used, as well as beds made of 16 fractions of quartz filtration sand obtained by sieving (polydisperse non-spherical particles). The range of bed voidages was 0.359-0.486, while the range of bed particle Reynolds numbers was from 0.3 to 286 for spherical particles and from 0.1 to 50 for non-spherical particles. The obtained results were compared using a number of available literature correlations. In order to improve the correlation results for spherical particles, a new simple equation was proposed in the form of Ergun's equation, with modified coefficients. The new correlation had a mean absolute deviation between experimental and calculated values of pressure drop of 9.04%. For non-spherical quartz filtration sand particles the best fit was obtained using Ergun's equation, with a mean absolute deviation of 10.36%. Surface-volume diameter (dsv) necessary for correlating the data for filtration sand particles was calculated based on correlations for d(v) = f(d(m)) and psi = f(d(m)).
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Friction factor for water flow through packed beds of spherical and non-spherical particles
EP  - 66
IS  - 1
SP  - 57
VL  - 23
DO  - 10.2298/CICEQ150506006K
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Bošković-Vragolović, Nevenka and Garić-Grulović, Radmila and Đuriš, Mihal and Grbavčić, Željko",
year = "2017",
abstract = "The aim of this work was the experimental evaluation of different friction factor correlations for water flow through packed beds of spherical and non-spherical particles at ambient temperature. The experiments were performed by measuring the pressure drop across the bed. Packed beds made of monosized glass spherical particles of seven different diameters were used, as well as beds made of 16 fractions of quartz filtration sand obtained by sieving (polydisperse non-spherical particles). The range of bed voidages was 0.359-0.486, while the range of bed particle Reynolds numbers was from 0.3 to 286 for spherical particles and from 0.1 to 50 for non-spherical particles. The obtained results were compared using a number of available literature correlations. In order to improve the correlation results for spherical particles, a new simple equation was proposed in the form of Ergun's equation, with modified coefficients. The new correlation had a mean absolute deviation between experimental and calculated values of pressure drop of 9.04%. For non-spherical quartz filtration sand particles the best fit was obtained using Ergun's equation, with a mean absolute deviation of 10.36%. Surface-volume diameter (dsv) necessary for correlating the data for filtration sand particles was calculated based on correlations for d(v) = f(d(m)) and psi = f(d(m)).",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Friction factor for water flow through packed beds of spherical and non-spherical particles",
pages = "66-57",
number = "1",
volume = "23",
doi = "10.2298/CICEQ150506006K"
}

Kaluđerović-Radoičić, T., Bošković-Vragolović, N., Garić-Grulović, R., Đuriš, M.,& Grbavčić, Ž.. (2017). Friction factor for water flow through packed beds of spherical and non-spherical particles. in Chemical Industry & Chemical Engineering Quarterly
Savez hemijskih inženjera, Beograd., 23(1), 57-66.
https://doi.org/10.2298/CICEQ150506006K

Kaluđerović-Radoičić T, Bošković-Vragolović N, Garić-Grulović R, Đuriš M, Grbavčić Ž. Friction factor for water flow through packed beds of spherical and non-spherical particles. in Chemical Industry & Chemical Engineering Quarterly. 2017;23(1):57-66.
doi:10.2298/CICEQ150506006K .

Kaluđerović-Radoičić, Tatjana, Bošković-Vragolović, Nevenka, Garić-Grulović, Radmila, Đuriš, Mihal, Grbavčić, Željko, "Friction factor for water flow through packed beds of spherical and non-spherical particles" in Chemical Industry & Chemical Engineering Quarterly, 23, no. 1 (2017):57-66,
https://doi.org/10.2298/CICEQ150506006K . .

TY  - CONF
AU  - Nikolić, Daliborka
AU  - Felischak, Matthias
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3503
AB  - Deliberate periodic operations have been recognized as one way of process intensification for several decades. Special attention has been dedicated to possible improvements of chemical reactor performance through periodic modulation of one or more inputs. In our previous investigations we have developed a new, nonlinear frequency response (NFR) method, as a fast and easy analytical method for evaluating the performance of forced periodically operated chemical reactors. The NFR method is based on nonlinear frequency response analysis and the concept of higher order frequency response function (FRFs) [1]. In its essence the method is approximate and it is limited to analysis of stable, weakly nonlinear systems. The method gives an answer whether, and in which cases, it is possible to obtain process improvement through periodic operation. It also gives an approximate quantitative estimate of the improvement. In addition, the method enables choosing the best forcing parameters of the modulated input(s) (frequency, amplitude and, for multiple input modulation, the phase difference between the input waves). The NFR method was originally developed for sinusoidal forcing function(s) [1]. Recently, it was extended to a general case which is applicable for any shape of the periodic input modulation, by expanding the input function into Fourier series and taking into account only a finite number of harmonics [2]. This opens a new possibility of choosing the best shape of the input wave, as well. In this paper, the NFR method is used to evaluate the performance of a forced periodically operated adiabatic continuous stirred tank reactor (CSTR) in which an exothermal reaction of hydrolysis of acetic acid anhydride to acetic acid takes place [3]. The analysisis performed for periodic modulations of the acetic anhydride concentration in the feed stream, around a previously established optimal steady state. Different shapes of the input forcing function (sinusoidal, square-wave, triangle, saw-tooth,…) were analyzed, in order to determine the best strategy of performing periodic operation. The acetic acid yield is used as a measure of the reactor performance. The increases of the product yield (relative to the steady-state value) for different shapes of the forcing function are compared. Finally, the best forcing strategy (regarding the shape, frequency and amplitude of the input wave) is chosen to be applied for experimental investigation in a lab-scale adiabatic CSTR.
C3  - 10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain
T1  - Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3503
ER  - 

@conference{
author = "Nikolić, Daliborka and Felischak, Matthias and Seidel-Morgenstern, Andreas and Petkovska, Menka",
year = "2017",
abstract = "Deliberate periodic operations have been recognized as one way of process intensification for several decades. Special attention has been dedicated to possible improvements of chemical reactor performance through periodic modulation of one or more inputs. In our previous investigations we have developed a new, nonlinear frequency response (NFR) method, as a fast and easy analytical method for evaluating the performance of forced periodically operated chemical reactors. The NFR method is based on nonlinear frequency response analysis and the concept of higher order frequency response function (FRFs) [1]. In its essence the method is approximate and it is limited to analysis of stable, weakly nonlinear systems. The method gives an answer whether, and in which cases, it is possible to obtain process improvement through periodic operation. It also gives an approximate quantitative estimate of the improvement. In addition, the method enables choosing the best forcing parameters of the modulated input(s) (frequency, amplitude and, for multiple input modulation, the phase difference between the input waves). The NFR method was originally developed for sinusoidal forcing function(s) [1]. Recently, it was extended to a general case which is applicable for any shape of the periodic input modulation, by expanding the input function into Fourier series and taking into account only a finite number of harmonics [2]. This opens a new possibility of choosing the best shape of the input wave, as well. In this paper, the NFR method is used to evaluate the performance of a forced periodically operated adiabatic continuous stirred tank reactor (CSTR) in which an exothermal reaction of hydrolysis of acetic acid anhydride to acetic acid takes place [3]. The analysisis performed for periodic modulations of the acetic anhydride concentration in the feed stream, around a previously established optimal steady state. Different shapes of the input forcing function (sinusoidal, square-wave, triangle, saw-tooth,…) were analyzed, in order to determine the best strategy of performing periodic operation. The acetic acid yield is used as a measure of the reactor performance. The increases of the product yield (relative to the steady-state value) for different shapes of the forcing function are compared. Finally, the best forcing strategy (regarding the shape, frequency and amplitude of the input wave) is chosen to be applied for experimental investigation in a lab-scale adiabatic CSTR.",
journal = "10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain",
title = "Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3503"
}

Nikolić, D., Felischak, M., Seidel-Morgenstern, A.,& Petkovska, M.. (2017). Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function. in 10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain.
https://hdl.handle.net/21.15107/rcub_technorep_3503

Nikolić D, Felischak M, Seidel-Morgenstern A, Petkovska M. Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function. in 10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain. 2017;.
https://hdl.handle.net/21.15107/rcub_technorep_3503 .

Nikolić, Daliborka, Felischak, Matthias, Seidel-Morgenstern, Andreas, Petkovska, Menka, "Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function" in 10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain (2017),
https://hdl.handle.net/21.15107/rcub_technorep_3503 .

TY  - JOUR
AU  - Živković, Luka
AU  - Pohar, Andrej
AU  - Likozar, Blaž
AU  - Nikačević, Nikola
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3346
AB  - Hydrogen, an important energy carrier of the future, produces no pollution and has a high content of energy. It is formed as a direct product of the water-gas shift (WGS) reaction, which occurs in various processes for the production of hydrogen, ammonia, methanol and different hydrocarbons, and is also a side reaction during the steam reforming of hydrocarbons and Fisher-Tropsch synthesis. Since it is an equilibrium reaction, it may be intensified by the selective removal of the products, which can lead to higher yields and energy savings. In this study, carbon dioxide was removed through chemisorption on CaO particles. In the first part, the WGS reaction kinetics were obtained on an industrial iron chromium catalyst in a packed-bed reactor. In the second part, the CO2 chemisorption kinetics on CaO sorbent particles were examined, simultaneously with the WGS reaction. A modified dynamic shrinking-core model was used to describe the carbonation reaction, which accounted for the non ideal core shrinkage. With the introduction of a sorbent conversion-dependent effective diffusion coefficient, the model perfectly reproduced the obtained experimental results. Valuable insight into the sorption-enhanced process was obtained with the full concentration profiles of the species involved (CO, H2O, CO2, H-2) in time and space, as well as the conversion of the sorbent particles, also in the radial dimension. The developed model was used to simulate a cyclic sorption-enhanced water-gas shift operation in a revolver-type manner which allows for continuous sorbent regeneration and a much higher than-equilibrium hydrogen production for various operational parameters. The significance of the model lies in the precise replication of the experimental results and its applicability to the vast area of the newly-emerged industrial sorption-enhanced technologies.
PB  - Elsevier Sci Ltd, Oxford
T2  - Applied Energy
T1  - Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production
EP  - 855
SP  - 844
VL  - 178
DO  - 10.1016/j.apenergy.2016.06.071
ER  - 

@article{
author = "Živković, Luka and Pohar, Andrej and Likozar, Blaž and Nikačević, Nikola",
year = "2016",
abstract = "Hydrogen, an important energy carrier of the future, produces no pollution and has a high content of energy. It is formed as a direct product of the water-gas shift (WGS) reaction, which occurs in various processes for the production of hydrogen, ammonia, methanol and different hydrocarbons, and is also a side reaction during the steam reforming of hydrocarbons and Fisher-Tropsch synthesis. Since it is an equilibrium reaction, it may be intensified by the selective removal of the products, which can lead to higher yields and energy savings. In this study, carbon dioxide was removed through chemisorption on CaO particles. In the first part, the WGS reaction kinetics were obtained on an industrial iron chromium catalyst in a packed-bed reactor. In the second part, the CO2 chemisorption kinetics on CaO sorbent particles were examined, simultaneously with the WGS reaction. A modified dynamic shrinking-core model was used to describe the carbonation reaction, which accounted for the non ideal core shrinkage. With the introduction of a sorbent conversion-dependent effective diffusion coefficient, the model perfectly reproduced the obtained experimental results. Valuable insight into the sorption-enhanced process was obtained with the full concentration profiles of the species involved (CO, H2O, CO2, H-2) in time and space, as well as the conversion of the sorbent particles, also in the radial dimension. The developed model was used to simulate a cyclic sorption-enhanced water-gas shift operation in a revolver-type manner which allows for continuous sorbent regeneration and a much higher than-equilibrium hydrogen production for various operational parameters. The significance of the model lies in the precise replication of the experimental results and its applicability to the vast area of the newly-emerged industrial sorption-enhanced technologies.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Applied Energy",
title = "Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production",
pages = "855-844",
volume = "178",
doi = "10.1016/j.apenergy.2016.06.071"
}

Živković, L., Pohar, A., Likozar, B.,& Nikačević, N.. (2016). Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production. in Applied Energy
Elsevier Sci Ltd, Oxford., 178, 844-855.
https://doi.org/10.1016/j.apenergy.2016.06.071

Živković L, Pohar A, Likozar B, Nikačević N. Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production. in Applied Energy. 2016;178:844-855.
doi:10.1016/j.apenergy.2016.06.071 .

Živković, Luka, Pohar, Andrej, Likozar, Blaž, Nikačević, Nikola, "Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production" in Applied Energy, 178 (2016):844-855,
https://doi.org/10.1016/j.apenergy.2016.06.071 . .

TY  - JOUR
AU  - Živković, Luka
AU  - Nikačević, Nikola
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3347
AB  - A novel method for reaction synthesis is proposed. The method establishes strong interconnection between process intensification (PI) principles and process system engineering (PSE) techniques, which are used for problem formulation and optimization. The general aim is to demonstrate a potential for innovative solutions that combine both optimal reactor structure and its operational regime. The method consists of three stages: (I) Reaction Screening, in which phenomenological modules are defined; (II) Reaction System Superstructure and Mathematical Modeling in which modules (building blocks) are connected in a generic reactor superstructure; and (III) Optimization in which optimal structure and operational regime is derived, using techno-economical objective function and different optimization methods. The proposed method is demonstrated on a general example of two parallel endothermic reactions in liquid phase. The optimization results show that continuous steady-state reactor system outperforms fed-batch reactor and has similar performance as more complex periodically operated continuous reactor, and thus presents the optimal solution.
PB  - Inst Chemical Engineers, Rugby
T2  - Chemical Engineering Research & Design
T1  - A method for reactor synthesis based on process intensification principles and optimization of superstructure consisting of phenomenological modules
EP  - 205
SP  - 189
VL  - 113
DO  - 10.1016/j.cherd.2016.07.008
ER  - 

@article{
author = "Živković, Luka and Nikačević, Nikola",
year = "2016",
abstract = "A novel method for reaction synthesis is proposed. The method establishes strong interconnection between process intensification (PI) principles and process system engineering (PSE) techniques, which are used for problem formulation and optimization. The general aim is to demonstrate a potential for innovative solutions that combine both optimal reactor structure and its operational regime. The method consists of three stages: (I) Reaction Screening, in which phenomenological modules are defined; (II) Reaction System Superstructure and Mathematical Modeling in which modules (building blocks) are connected in a generic reactor superstructure; and (III) Optimization in which optimal structure and operational regime is derived, using techno-economical objective function and different optimization methods. The proposed method is demonstrated on a general example of two parallel endothermic reactions in liquid phase. The optimization results show that continuous steady-state reactor system outperforms fed-batch reactor and has similar performance as more complex periodically operated continuous reactor, and thus presents the optimal solution.",
publisher = "Inst Chemical Engineers, Rugby",
journal = "Chemical Engineering Research & Design",
title = "A method for reactor synthesis based on process intensification principles and optimization of superstructure consisting of phenomenological modules",
pages = "205-189",
volume = "113",
doi = "10.1016/j.cherd.2016.07.008"
}

Živković, L.,& Nikačević, N.. (2016). A method for reactor synthesis based on process intensification principles and optimization of superstructure consisting of phenomenological modules. in Chemical Engineering Research & Design
Inst Chemical Engineers, Rugby., 113, 189-205.
https://doi.org/10.1016/j.cherd.2016.07.008

Živković L, Nikačević N. A method for reactor synthesis based on process intensification principles and optimization of superstructure consisting of phenomenological modules. in Chemical Engineering Research & Design. 2016;113:189-205.
doi:10.1016/j.cherd.2016.07.008 .

Živković, Luka, Nikačević, Nikola, "A method for reactor synthesis based on process intensification principles and optimization of superstructure consisting of phenomenological modules" in Chemical Engineering Research & Design, 113 (2016):189-205,
https://doi.org/10.1016/j.cherd.2016.07.008 . .

TY  - JOUR
AU  - Todić, Branislav
AU  - Nowicki, Lech
AU  - Nikačević, Nikola
AU  - Bukur, Dragomir B.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3411
AB  - The effect of process conditions on product selectivity of Fischer-Tropsch synthesis (FTS) over industrial iron-based catalyst (100 Fe/5 Cu/4.2 K/25 SiO2) was studied in a 1-L stirred tank slurry reactor. Experiments were performed over a range of different reaction conditions, including three temperatures (T = 493, 513 and 533K), four pressures (P = 0.8, 1.5, 2.25 and 2.5 MPa), two synthesis gas feed molar ratios (H-2/CO = 0.67 and 2) and gas space velocity from 0.52 to 23.5 Ndm(3)/g-Fe/h. The effect of process conditions on reaction pathways of FTS and secondary 1-olefin reactions was analyzed by comparing product selectivities, chain growth probabilities and ratios of main products (n-paraffin, 1- and 2-olefin). Reduction of methane production and increase of C5+ products was achieved by decreasing temperature, inlet H-2/CO ratio and/or increasing pressure. Overall selectivity toward methane and C5+ did not show significant changes with variations in residence time. All of the product selectivity variations were shown to be related to changes in chain length dependent growth probabilities.
PB  - Elsevier Science Bv, Amsterdam
T2  - Catalysis Today
T1  - Fischer-Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions
EP  - 39
SP  - 28
VL  - 261
DO  - 10.1016/j.cattod.2015.09.005
ER  - 

@article{
author = "Todić, Branislav and Nowicki, Lech and Nikačević, Nikola and Bukur, Dragomir B.",
year = "2016",
abstract = "The effect of process conditions on product selectivity of Fischer-Tropsch synthesis (FTS) over industrial iron-based catalyst (100 Fe/5 Cu/4.2 K/25 SiO2) was studied in a 1-L stirred tank slurry reactor. Experiments were performed over a range of different reaction conditions, including three temperatures (T = 493, 513 and 533K), four pressures (P = 0.8, 1.5, 2.25 and 2.5 MPa), two synthesis gas feed molar ratios (H-2/CO = 0.67 and 2) and gas space velocity from 0.52 to 23.5 Ndm(3)/g-Fe/h. The effect of process conditions on reaction pathways of FTS and secondary 1-olefin reactions was analyzed by comparing product selectivities, chain growth probabilities and ratios of main products (n-paraffin, 1- and 2-olefin). Reduction of methane production and increase of C5+ products was achieved by decreasing temperature, inlet H-2/CO ratio and/or increasing pressure. Overall selectivity toward methane and C5+ did not show significant changes with variations in residence time. All of the product selectivity variations were shown to be related to changes in chain length dependent growth probabilities.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Catalysis Today",
title = "Fischer-Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions",
pages = "39-28",
volume = "261",
doi = "10.1016/j.cattod.2015.09.005"
}

Todić, B., Nowicki, L., Nikačević, N.,& Bukur, D. B.. (2016). Fischer-Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions. in Catalysis Today
Elsevier Science Bv, Amsterdam., 261, 28-39.
https://doi.org/10.1016/j.cattod.2015.09.005

Todić B, Nowicki L, Nikačević N, Bukur DB. Fischer-Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions. in Catalysis Today. 2016;261:28-39.
doi:10.1016/j.cattod.2015.09.005 .

Todić, Branislav, Nowicki, Lech, Nikačević, Nikola, Bukur, Dragomir B., "Fischer-Tropsch synthesis product selectivity over an industrial iron-based catalyst: Effect of process conditions" in Catalysis Today, 261 (2016):28-39,
https://doi.org/10.1016/j.cattod.2015.09.005 . .