Document Type : Full article


CFD Research Center, Chemical Engineering Department, Razi University, Kermanshah, Iran


In this work, extraction of propionic acid from the aqueous phase to the organic phase (1-octanol) was performed in T-junction microchannels and effects of channel diameter and fluid flow rate on the mass transfer characteristics were investigated. The two-phase flow patterns in studied microchannels with 0.4 and 0.8 mm diameters were observed. Weber ‎ number and surface-to-volume ratio were calculated for evaluating flow patterns. Moreover, the effect of volumetric flow rates on the extraction ‎efficiency, volumetric mass transfer coefficient, and pressure drop was examined. Results showed that the pressure drop in the microchannel with 0.4 mm diameter is 2-2.7 times higher than that in the microchannel with 0.8 mm diameter. In both microchannels, with increase in flow rate, the extraction ‎efficiency first increases and then decreases. In addition, at high flow rates (2.4, 4.5 and 6 mL/min), the extraction ‎efficiency in the microchannel with 0.8 mm diameter increased up to the range of 7-14.9 % compared with that in the microchannel with 0.4 mm diameter.


Main Subjects

[1]      Yang, L., Zhao, Y., Su, Y. and Chen, G., “An experimental study of copper extraction characteristics in a T-junction microchannel”, Chem. Eng. Technol., 36 (6), 985 (2013).
[2]      Mahjoob, M., Etemad, S. G. and Thibault, J., “Numerical study of non-Newtonian flow through rectangular microchannels”, Iranian J. Chem. Eng., 6 (4), 45 (2009).
[3]      Almasvandi, M. and Rahimi, M., “Waste water ammonia stripping intensification using microfluidic system”, Iranian J. Chem. Eng., 14 (4), 17 (2017).
[4]      Basiri, M., Rahimi, M. and Babaei, M. H., “Ultrasound-assisted biodiesel production in microreactors”, Iranian J. Chem. Eng., 13 (2), 22 (2016).
[5]      Tang, J., Zhang, X., Cai, W. and Wang, F., “Liquid-liquid extraction based on droplet flow in a vertical microchannel”, Exp. Therm. Fluid. Sci., 49, 185 (2013).
[6]      Zhang, L., Xie, F., Li, S., Yin, S., Peng, J. and Ju, S., “Solvent extraction of Nd(III) in a Y type microchannel with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester”, Green Process Synthesis, 4 (1), (2015).
[7]      Kashid, M. N., Gupta, A., Renken, A. and Kiwi-Minsker, L., “Numbering-up and mass transfer studies of liquid-liquid two-phase microstructured reactors”, Chem. Eng. J., 158 (2), 233 (2010).
[8]      Dessimoz, A. -L., Cavin, L., Renken, A. and Kiwi-Minsker, L., “Liquid-liquid two-phase flow patterns and mass transfer characteristics in rectangular glass microreactors”, Chem. Eng. Sci., 63 (16), 4035 (2008).
[9]      N. Kashid, M., Renken, A. and Kiwi-Minsker, L., “Influence of flow regime on mass transfer in different types of microchannels”, Ind. Eng. Chem. Res., 50 (11), 6906 (2011).
[10]  Boogar, R. S., Gheshlaghi, R. and Mahdavi, M. A., “The effects of viscosity, surface tension, and flow rate on gasoil-water flow pattern in microchannels”, Korean J. Chem. Eng., 30 (1), 45 (2013).
[11]  Coleman, J. W. and Garimella, S., “Characterization of two-phase flow patterns in small diameter round and rectangular tubes”, Int. J. Heat Mass Transfer, 42 (15), 2869 (1999).
[12]  Basiri, M., Rahimi, M. and Mohammadi, F., “Investigation of liquid-liquid two-phase flow pattern in microreactors for biodiesel production”, Iranian J. Chem. Eng., 12 (3), 33 (2015).
[13]  Plouffe, P., Roberge, D. M. and Macchi, A., “Liquid-liquid flow regimes and mass transfer in various micro-reactors”, Chem. Eng. J., 300, 9 (2016).
[14]  Keshav, A., Wasewar, K. L. and Chand, S., “Extraction of propionic acid using different extractants (tri-n-butylphosphate, tri-n-octylamine, and Aliquat 336)”, Ind. Eng. Chem. Res., 47 (16), 6192 (2008).
[15]  Aşçı, Y. S. and İnci, İ., “Extraction equilibria of propionic acid from aqueous solutions by Amberlite LA-2 in diluent solvents”, Chem. Eng. J., 155 (3), 784 (2009).
[16]  Keshav, A., Wasewar, K. L. and Chand, S., “Extraction of propionic acid with tri-n-octyl amine in different diluents”, Sep. Purif. Technol., 63 (1), 179 (2008).
[17]  Uslu, H., “Reactive extraction of formic acid by using Tri Octyl Amine (TOA) ”, Sep. Sci. Technol., 44 (8), 1784 (2009).
[18]  Ghalami-Choobar, B., Ghanadzadeh, A. and Kousarimehr, S., “Salt effect on the liquid-liquid equilibrium of (water+ propionic acid+ cyclohexanol) system at T=(298.2, 303.2, and 308.2) K”, Chin. J. Chem. Eng., 19 (4), 565 (2011).
[19]  Dan, W., Hao, C., Jiang, L., Jin, C., Zhinan, X. and Peilin, C., “Efficient separation of butyric acid by an aqueous two-phase system with calcium chloride”, Chin. J. Chem. Eng., 18 (4), 533 (2010).
[20]  İnce, E. and Aşçı, Y. S., “(Liquid+liquid) equilibria of the (water+carboxylic acid+dibasic esters mixture (DBE-2)) ternary systems”, Fluid Phase Equilib., 370, 19 (2014).
[21]   Zhao, Y., Chen, G. and Yuan, Q., “Liquid-liquid two-phase mass transfer in the T-junction microchannels”, AIChE J., 53 (12), 3042 (2007).
[22]  Kashid, M., Harshe, Y. and Agar, D., “Liquid-liquid slug flow in a capillary: An alternative to suspended drop or film contactors”, Ind. Eng. Chem. Res., 46 (25), 8420 (2007).
[23]  Zhao, Y., Chen, G. and Yuan, Q., “Liquid-liquid two-phase flow patterns in a rectangular microchannel”, AIChE J., 52 (12), 4052 (2006).
[24]  Assmann, N. and von Rohr, P. R., “Extraction in microreactors: Intensification by adding an inert gas phase”, Chem. Eng. Process., 50 (8), 822 (2011).
[25]  Tsaoulidis, D., Dore, V., Angeli, P., Plechkova, N. V. and Seddon, K. R., “Dioxouranium(VI) extraction in microchannels using ionic liquids”, Chem. Eng. J., 227, 151 (2013).
[26]  Jovanović, J., Rebrov, E. V., Nijhuis, T. A., Kreutzer, M. T., Hessel, V. and Schouten, J. C., “Liquid-liquid flow in a capillary microreactor: Hydrodynamic flow patterns and extraction performance”, Ind. Eng. Chem. Res., 51 (2), 1015 (2012).
[27]  Azimi, N., Rahimi, M. and Abdollahi, N., “Using magnetically excited nanoparticles for liquid–liquid two-phase mass transfer enhancement in a Y-type micromixer”, Chem. Eng. Process., 97, 12 (2015).
[28]  Mondal, P., Ghosh, S., Das, G. and Ray, S., “Phase inversion and mass transfer during liquid-liquid dispersed flow through mini-channel”, Chem. Eng. Process, 49 (10), 1051 (2010).
[29]  Biswas, K. G., Das, G., Ray, S. and Basu, J. K., “Mass transfer characteristics of liquid-liquid flow in small diameter conduits”, Chem. Eng. Sci., 122, 652 (2015).