Modeling of mass transport through the membrane in pervaporation of aqueous ethanol solutions
Paper ID : 1163-MST2015-FULL
Marzieh Aghakarimiha, Gholamreza Pazuki
Amirkabir University of Technology (Tehran Polytechnic)
This study focuses on the modeling of mass transport in the pervaporation process for separation of the ethanol/water mixtures using polydimethylsiloxane (PDMS) membrane. The SAFT-VR equation of state was used to estimate the equilibrium sorption of ethanol and water into the PDMS membrane. The Maxwell-Stefan equation was employed to express the transport of permeating compounds through the membrane. The modeling results were compared with the experimental data obtained from the pervaporation of ethanol from its aqueous solution at various feed flow rate and temperature. The develop model is able to predict the permeation of ethanol and water through the PDMS membrane. The influence of feed concentration and temperature on the permeation flux and ethanol selectivity was successfully predicted by the proposed model. Furthermore, the results showed a reasonable agreement between the predicted and experimental data. For feed ethanol concentration of 2%wt. at feed temperature of 45°C, the average absolute relative deviation (AARD) of 4.03 and 5.50% was observed for the ethanol and water fluxes, respectively.
Pervaporation; Mass transfer modeling; SAFT-VR; Maxwell-Stefan equation; Ethanol/water separation
Status : Paper Accepted (Oral Presentation)