TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Šućurović, Katarina
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Krstić, Sanja
AU  - Bošković-Vragolović, Nevenka
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6806
AB  - In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds.
AB  - U ovom radu je određivan koeficijent prenosa mase fluid-zid u inverznofluidizovanom sloju primenom adsorpcione metode. Eksperimenti su vršeni u koloni  prečnika 45 mm sa sferičnim i nesferičnim česticama polipropilena i polietilena  prečnika 3.3-4.9 mm i gustine oko 930 kg m-3. Kao fluidizacioni medijum korišćen je  razblaženi rastvor metilenski plavog koji je adsorbovan na delu površine kolone na  silikagelu. Dobijeni rezultati pokazali su da prisustvo čestica pri inverznoj  fluidizaciji ne doprinosi značajno prenosu mase u poređenju sa uticajem čestica na  prenos mase u konvencionalno fluidizovanim slojevima. Zbog toga je u analizu uveden  koncept pseudofluida i izvedena je empirijska korelacija za određivanje koeficijenta  prenosa mase. Izvršeno je poređenje dobijenih rezultata sa literaturnim korelacijama za  inverznu i konvencionalnu fluidizacije.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Mass transfer in inverse fluidized beds
T1  - Prenos mase u inverzno fluidizovanom sloju
EP  - 919
IS  - 9
SP  - 905
VL  - 88
DO  - 10.2298/JSC230116016J
ER  - 

@article{
author = "Jaćimovski, Darko and Šućurović, Katarina and Đuriš, Mihal and Arsenijević, Zorana and Krstić, Sanja and Bošković-Vragolović, Nevenka",
year = "2023",
abstract = "In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds., U ovom radu je određivan koeficijent prenosa mase fluid-zid u inverznofluidizovanom sloju primenom adsorpcione metode. Eksperimenti su vršeni u koloni  prečnika 45 mm sa sferičnim i nesferičnim česticama polipropilena i polietilena  prečnika 3.3-4.9 mm i gustine oko 930 kg m-3. Kao fluidizacioni medijum korišćen je  razblaženi rastvor metilenski plavog koji je adsorbovan na delu površine kolone na  silikagelu. Dobijeni rezultati pokazali su da prisustvo čestica pri inverznoj  fluidizaciji ne doprinosi značajno prenosu mase u poređenju sa uticajem čestica na  prenos mase u konvencionalno fluidizovanim slojevima. Zbog toga je u analizu uveden  koncept pseudofluida i izvedena je empirijska korelacija za određivanje koeficijenta  prenosa mase. Izvršeno je poređenje dobijenih rezultata sa literaturnim korelacijama za  inverznu i konvencionalnu fluidizacije.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Mass transfer in inverse fluidized beds, Prenos mase u inverzno fluidizovanom sloju",
pages = "919-905",
number = "9",
volume = "88",
doi = "10.2298/JSC230116016J"
}

Jaćimovski, D., Šućurović, K., Đuriš, M., Arsenijević, Z., Krstić, S.,& Bošković-Vragolović, N.. (2023). Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 88(9), 905-919.
https://doi.org/10.2298/JSC230116016J

Jaćimovski D, Šućurović K, Đuriš M, Arsenijević Z, Krstić S, Bošković-Vragolović N. Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society. 2023;88(9):905-919.
doi:10.2298/JSC230116016J .

Jaćimovski, Darko, Šućurović, Katarina, Đuriš, Mihal, Arsenijević, Zorana, Krstić, Sanja, Bošković-Vragolović, Nevenka, "Mass transfer in inverse fluidized beds" in Journal of the Serbian Chemical Society, 88, no. 9 (2023):905-919,
https://doi.org/10.2298/JSC230116016J . .

TY  - JOUR
AU  - Krstić, Sanja
AU  - Kaluđerović, Branka
AU  - Dodevski, Vladimir
AU  - Bjelajac, Anđelika
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2952
AB  - A carbon-rich solid product has been synthesized by hydrothermal treatment from fructose with HNO3 at temperature of 140°C. The concentration of the precursor was changed in order to investigate how its change influences formation of carbon microspheres. pH value for every sample was the same, i.e. 1. The formation of the carbon rich solid through the hydrothermal carbonization of fructose is the consequence of dehydration reactions. Obtained carbon material is made of spherical micrometer-sized particles with the diameter in the 1-6 µm range, which can be modulated by modifying the concentration of fructose in solution. The best results are obtained with smaller concentrations of fructose. Spherical particles have more regular shape and they are less agglomerated. The structure and surface chemical properties of obtained material were characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectra and elemental analysis.
AB  - Čvrsti proizvod bogat ugljenikom je sintetizovan hidrotermičkim tretmanom fruktoze sa HNO3 na temperaturi od 140 °C. Koncentracija prekursora bila je menjana da bi se istražilo kako njegova promena utiče na formiranje mikrosfere atoma. pH vrednost za svaki uzorak bila je isti 1. Formiranje čvrstog proizvoda bogatog ugljenikom preko hidrotermičke karbonizacije fruktoze posledica je dehidracionih reakcija. Dobijeni ugljeni materijal izrađen je od sfernih čestica veličine prečnika od 1 do 6 µm, koji se može modulisati promenom koncentracije fruktoze u rastvoru. Najbolji rezultati se dobijaju sa manjim koncentracijama fruktoze. Sferne čestice imaju više pravilan oblik i oni su manje aglomerisane. Strukture i površinske hemijske osobine dobijenog materijala su sagledavane skeniranjem elektronskim mikroskopom (SEM) , FTIR-om i spektralnim i elementarnim analizama.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Structural properties of carbon microspheres obtained by hydrothermal treatment of fructose
T1  - Strukturne osobine mikrosfera ugljenika dobijenih hidrotermičkim tretmanom fruktoze
EP  - 158
IS  - 2
SP  - 155
VL  - 56
DO  - 10.5937/ZasMat1502155K
ER  - 

@article{
author = "Krstić, Sanja and Kaluđerović, Branka and Dodevski, Vladimir and Bjelajac, Anđelika",
year = "2015",
abstract = "A carbon-rich solid product has been synthesized by hydrothermal treatment from fructose with HNO3 at temperature of 140°C. The concentration of the precursor was changed in order to investigate how its change influences formation of carbon microspheres. pH value for every sample was the same, i.e. 1. The formation of the carbon rich solid through the hydrothermal carbonization of fructose is the consequence of dehydration reactions. Obtained carbon material is made of spherical micrometer-sized particles with the diameter in the 1-6 µm range, which can be modulated by modifying the concentration of fructose in solution. The best results are obtained with smaller concentrations of fructose. Spherical particles have more regular shape and they are less agglomerated. The structure and surface chemical properties of obtained material were characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectra and elemental analysis., Čvrsti proizvod bogat ugljenikom je sintetizovan hidrotermičkim tretmanom fruktoze sa HNO3 na temperaturi od 140 °C. Koncentracija prekursora bila je menjana da bi se istražilo kako njegova promena utiče na formiranje mikrosfere atoma. pH vrednost za svaki uzorak bila je isti 1. Formiranje čvrstog proizvoda bogatog ugljenikom preko hidrotermičke karbonizacije fruktoze posledica je dehidracionih reakcija. Dobijeni ugljeni materijal izrađen je od sfernih čestica veličine prečnika od 1 do 6 µm, koji se može modulisati promenom koncentracije fruktoze u rastvoru. Najbolji rezultati se dobijaju sa manjim koncentracijama fruktoze. Sferne čestice imaju više pravilan oblik i oni su manje aglomerisane. Strukture i površinske hemijske osobine dobijenog materijala su sagledavane skeniranjem elektronskim mikroskopom (SEM) , FTIR-om i spektralnim i elementarnim analizama.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Structural properties of carbon microspheres obtained by hydrothermal treatment of fructose, Strukturne osobine mikrosfera ugljenika dobijenih hidrotermičkim tretmanom fruktoze",
pages = "158-155",
number = "2",
volume = "56",
doi = "10.5937/ZasMat1502155K"
}

Krstić, S., Kaluđerović, B., Dodevski, V.,& Bjelajac, A.. (2015). Structural properties of carbon microspheres obtained by hydrothermal treatment of fructose. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 56(2), 155-158.
https://doi.org/10.5937/ZasMat1502155K

Krstić S, Kaluđerović B, Dodevski V, Bjelajac A. Structural properties of carbon microspheres obtained by hydrothermal treatment of fructose. in Zaštita materijala. 2015;56(2):155-158.
doi:10.5937/ZasMat1502155K .

Krstić, Sanja, Kaluđerović, Branka, Dodevski, Vladimir, Bjelajac, Anđelika, "Structural properties of carbon microspheres obtained by hydrothermal treatment of fructose" in Zaštita materijala, 56, no. 2 (2015):155-158,
https://doi.org/10.5937/ZasMat1502155K . .