Solids flow pattern in continuous oscillatory baffled reactor
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 concentr...ation 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.
Keywords:
Continuous oscillatory baffled reactor / Two-phase flow / Solids flow pattern / Axial dispersion model / Batch to continuous / Process intensificationSource:
Chemical Engineering and Processing-Process Intensification, 2019, 135, 108-119Publisher:
- Elsevier Science Sa, Lausanne
Funding / projects:
- Develooment and utilization of novel and traditional technologies in production of competitive food products with added valued for national and global market - CREATING WEALTH FROM THE WEALTH OF SERBIA (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-46001)
- Novel encapsulation and enzyme technologies for designing of new biocatalysts and biologically active compounds targeting enhancement of food quality, safety and competitiveness (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-46010)
- The development of efficient chemical-engineering processes based on the transport phenomena research and process intensification principles (RS-MESTD-Basic Research (BR or ON)-172022)
DOI: 10.1016/j.cep.2018.11.017
ISSN: 0255-2701
WoS: 000457511600010
Scopus: 2-s2.0-85057504544
Institution/Community
Tehnološko-metalurški fakultetTY - 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 . .