The effect of the physical properties of the liquid phase on the gas-liquid mass transfer coefficient in two- and three-phase agitated systems
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Anna Kiełbus-Rąpała
,
Joanna Karcz
Abstract
The results of studies concerning two- and three-phase systems in an agitated vessel are presented. The aim of our research was to investigate the effect of the physical properties of the liquid phase on the value of the volumetric gas-liquid mass transfer coefficient in mechanically agitated gas-liquid and gas-solid-liquid systems. Our experimental studies were conducted in a vessel with an internal diameter of 0.288 m. The flat bottom vessel, equipped with four baffles, was filled with liquid up to a height equal to the inner diameter. The liquid volume was 0.02 m3. Three high-speed impellers of a diameter equal to 0.33 of the vessel diameter were used: Rushton turbine (RT), Smith turbine (CD 6), or A 315 impeller. The measurements were carried out in coalescing and non-coalescing systems. Distilled water and aqueous solutions of an electrolyte (sodium chloride) of two different concentrations were used as the liquid phase. The gas phase was air. In the three-phase system, particles of sea sand were used as solid phase. The measurements were conducted at five different gas-flow rates and three particle loadings. Volumetric gas-liquid mass transfer coefficients were measured using the dynamic method. The presence and concentration of an electrolyte strongly affected the value of the gas-liquid mass transfer coefficient in both two- and three-phase systems. For all agitators used, significantly higher k l a coefficient values were obtained in the 0.4 kmol m−3 and 0.8 kmol m−3 aqueous NaCl solutions compared with the data for a coalescing system (with distilled water as the liquid phase). The k l a coefficient did not exhibit a linear relationship with the electrolyte concentration. An increase in the sodium chloride concentration from 0.4 kmol m−3 to 0.8 kmol m−3 caused a considerable decrease in the volumetric mass transfer coefficient in both the two-phase and three-phase systems. It was concluded that the mass transfer processes improved at a certain concentration of ions; however, above this concentration no further increase in k l a could be achieved.
[1] Arjunwadkar, S. J., Sarvanan, K., Kulkarni, P. R., & Pandit, A. B. (1998). Gas-liquid mass transfer in dual impeller bioreactor. Biochemical Engineering Journal, 1, 99–106. DOI:10.1016/S1385-8947(97)00083-1. http://dx.doi.org/10.1016/S1385-8947(97)00083-110.1016/S1385-8947(97)00083-1Suche in Google Scholar
[2] Bujalski, W., Nienow, A. W., & Liu, H. (1990). The use of upward pumping 45° pitched blade turbine impellers in threephase reactors. Chemical Engineering Science, 45, 415–421. DOI: 10.1016/0009-2509(90)87027-P. http://dx.doi.org/10.1016/0009-2509(90)87027-P10.1016/0009-2509(90)87027-PSuche in Google Scholar
[3] Garcia-Ochoa, F., & Gomez, E. (1998). Mass transfer coefficient in stirred tank reactors for xanthan gum solutions. Biochemical Engineering Journal, 1, 1–10. DOI: 10.1016/S1369-703X(97)00002-8. http://dx.doi.org/10.1016/S1369-703X(97)00002-810.1016/S1369-703X(97)00002-8Suche in Google Scholar
[4] Gibilaro, L. G., Davies, S. N., Cooke, M., Lynch, P. M., & Middleton, J. C. (1985). Initial response analysis of mass transfer in a gas sparged stirred vessel. Chemical Engineering Science, 40, 1811–1816. DOI: 10.1016/0009-2509(85)80115-9. http://dx.doi.org/10.1016/0009-2509(85)80115-910.1016/0009-2509(85)80115-9Suche in Google Scholar
[5] Gogate, P. R., Beenackers, A. A. C. M., & Pandit, A. B. (2000). Multiple-impeller systems with a special emphasis on bioreactors: a critical review. Biochemical Engineering Journal, 6, 109–144. DOI: 10.1016/S1369-703X(00)00081-4. http://dx.doi.org/10.1016/S1369-703X(00)00081-410.1016/S1369-703X(00)00081-4Suche in Google Scholar
[6] Greaves, M., & Loh, V. Y. (1985). Effect of high solids concentrations on mass transfer and gas hold-up in three-phase mixing. In Proceedings of the 5th European Conference on Mixing, 10–12 June 1985 (pp. 451–467). Würzburg, Germany. Suche in Google Scholar
[7] Kiełbus-Rąpała, A., & Karcz, J. (2010). Solid suspension and gas dispersion in gas-solid-liquid agitated systems. Chemical Papers, 64, 154–162. DOI: 10.2478/s11696-009-0104-9. http://dx.doi.org/10.2478/s11696-009-0104-910.2478/s11696-009-0104-9Suche in Google Scholar
[8] Kiełbus-Rąpała, A., & Karcz, J. (2009). Influence of suspended solid particles on gas-liquid mass transfer coefficient in a system stirred by double impellers. Chemical Papers, 63, 188–196. DOI: 10.2478/s11696-009-0013-y. http://dx.doi.org/10.2478/s11696-009-0013-y10.2478/s11696-009-0013-ySuche in Google Scholar
[9] Kilonzo, P. M., & Margaritis, A. (2004). The effects on non-Newtonian fermentation broth viscosity and small bubble segregation on oxygen mass transfer in gas-lift bioreactors: a critical review. Biochemical Engineering Journal, 17, 27–40. DOI: 10.1016/S1369-703X(03)00121-9. http://dx.doi.org/10.1016/S1369-703X(03)00121-910.1016/S1369-703X(03)00121-9Suche in Google Scholar
[10] Kluytmans, J. H. J., van Wachem, B. G. M., Kuster, B. F. M., & Schouten, J. C. (2003). Mass transfer in sparged and stirred reactors: influence of carbon particles and electrolyte. Chemical Engineering Science, 58, 4719–4728. DOI:10.1016/j.ces.2003.05.004. http://dx.doi.org/10.1016/j.ces.2003.05.00410.1016/j.ces.2003.05.004Suche in Google Scholar
[11] Laakkonen, M., Alopaeus, V., & Aittamaa, J. (2006). Validation of bubble breakage, coalescence and mass transfer models for gas-liquid dispersion in agitated vessel. Chemical Engineering Science, 61, 218–228. DOI:10.1016/j.ces.2004.11.066. http://dx.doi.org/10.1016/j.ces.2004.11.06610.1016/j.ces.2004.11.066Suche in Google Scholar
[12] Lu, W. M., Hsu, R. C., & Chou, H. S. (1993). Effect of solid concentration on gas-liquid mass transfer in a mechanically agitated three phase reactor. Journal of the Chinese Institute of Chemical Engineers, 24, 31–39. Suche in Google Scholar
[13] Ozkan, O., Calimli, A., Berber, R., & Oguz, H. (2000). Effect on inert solid particles at low concentrations on gas-liquid mass transfer in mechanically agitated reactors. Chemical Engineering Science, 55, 2737–2740. DOI: 10.1016/S0009-2509(99)00532-1. http://dx.doi.org/10.1016/S0009-2509(99)00532-110.1016/S0009-2509(99)00532-1Suche in Google Scholar
[14] Özbek, B., & Gayik, S. (2001). The studies on the oxygen mass transfer coefficient in bioreactor. Process Biochemistry, 36, 729–741. DOI: 10.1016/S0032-9592(00)00272-7. http://dx.doi.org/10.1016/S0032-9592(00)00272-710.1016/S0032-9592(00)00272-7Suche in Google Scholar
[15] Puthli, M. S., Rathod, V. K., & Pandit, A. B. (2005). Gas-liquid mass transfer studies with triple impeller system on a laboratory scale bioreactor. Biochemical Engineering Journal, 23, 25–30. DOI: 10.1016/j.bej.2004.10.006. http://dx.doi.org/10.1016/j.bej.2004.10.00610.1016/j.bej.2004.10.006Suche in Google Scholar
[16] Poncin, S., Nguyen, C., Midoux, N., & Breysse, J. (2002). Hydrodynamics and volumetric gas-liquid mass transfer coefficient of a stirred vessel equipped with a gas-inducing impeller. Chemical Engineering Science, 57, 3299–3306. DOI:10.1016/S0009-2509(02)00200-2. http://dx.doi.org/10.1016/S0009-2509(02)00200-210.1016/S0009-2509(02)00200-2Suche in Google Scholar
[17] Ruthiya, K. C., van der Schaaf, J., Kuster, B. F. M., & Schouten, J. C. (2003). Mechanism of physical and reaction enhancement of mass transfer in a gas inducing stirred slurry reactor. Chemical Engineering Journal, 96, 55–69. DOI: 10.1016/j.cej.2003.08.005. http://dx.doi.org/10.1016/j.cej.2003.08.00510.1016/j.cej.2003.08.005Suche in Google Scholar
[18] Scargiali, F., Russo, R., Grisafi, F., & Brucato, A. (2007). Mass transfer and hydrodynamic characteristics of a high aspect ratio self-ingesting reactor for gas-liquid operations. Chemical Engineering Science, 62, 1376–1387. DOI:10.1016/j.ces.2006.11.040. http://dx.doi.org/10.1016/j.ces.2006.11.04010.1016/j.ces.2006.11.040Suche in Google Scholar
[19] Van’t Riet, K. (1979). Review of measuring methods and results in nonviscous gas-liquid mass transfer in stirred vessels. Industrial & Engineering Chemistry Process Design and Development, 18, 357–364. DOI: 10.1021/i260071a001. http://dx.doi.org/10.1021/i260071a00110.1021/i260071a001Suche in Google Scholar
[20] Zwietering, T. N. (1958). Suspending of solids particles in liquid by agitation. Chemical Engineering Science, 8, 244–253. DOI: 10.1016/0009-2509(58)85031-9. http://dx.doi.org/10.1016/0009-2509(58)85031-910.1016/0009-2509(58)85031-9Suche in Google Scholar
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- Continuous production of citric acid from raw glycerol by Yarrowia lipolytica in cell recycle cultivation
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- Kinetic study of pyrolysis of waste water treatment plant sludge
- Transport phenomena in an agitated vessel with an eccentrically located impeller
- Membrane extraction of 1-phenylethanol from fermentation solution
- Theoretical study on transesterification in a combined process consisting of a reactive distillation column and a pervaporation unit
- Wall effects on terminal falling velocity of spherical particles moving in a Carreau model fluid
- The effect of the physical properties of the liquid phase on the gas-liquid mass transfer coefficient in two- and three-phase agitated systems
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- Effect of CeO2 and Sb2O3 on the phase transformation and optical properties of photostable titanium dioxide
- Carnauba wax microparticles produced by melt dispersion technique
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