Hydrodynamic performance in mesoporous silica membrane for lactic acid and esterifiecation.
Nwogu, Ngozi Claribelle
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OKON, E.P., SHEHU, H., KAJAMA, M.N, ORIMOLOYE, A.O., NWOGU, N.C., ORAKWE, I.R. and GOBINA, E. 2015. Hydrodynamic performance in mesoporous silica membrane for lactic acid and esterifiecation. Lecture notes in engineering and computer science: Proceedings of the world congress on engineering 2015 (WCE 2015) [online], Vol II, 1-3 July 2015, London, UK. Hong Kong: Newswood Limited, pages 781-784. Available from: http://www.iaeng.org/publication/WCE2015/WCE2015_pp781-784.pdf
Ethyl Lactate has a lot of applications in different industries including food, pharmaceutical and agricultural processes. The esterification process of lactic acid and ethanol is a highly-equilibrium-controlled reaction. The selective removal of one of the reaction products can be improved using membrane. In this work, the hydrodynamic performance of silica membrane with single carrier gases was analysed to determine the flow mechanism of the gases at the gauge pressure range of 0.01 to 1.00 bar and a temperature of 140 C. The results showed that the gas flux increases with increase in gauge pressure indicating Knudsen mechanism of gas transport. The R2 value for the four gases used (CO2, He, Ar and N2) were in the range of 0.98 - 1.00. The gas permeance was found to decrease with respect to the gauge pressure in the order N2 > Ar > He > CO2 confirming non-Knudsen mechanism of gas transport. Gases with higher kinetic diameter showed a higher permeance indicating a non-molecular sieving mechanism of gas transport. The gas permeance with respect to viscosity indicates viscous mechanism of gas transport. The decreasing order of the gas viscosity with respect to gas permeance was CO2 < He < Ar < N2.