Abstract
Permeation rates in vacuum and gas sweeping pervaporation were measured for aqueous ethanol solutions with a flat silicone rubber membrane over a wide range of gas flow rate, operating pressure in the permeate side, feed concentration and feed temperature. The observed permeate fluxes in vacuum pervaporation were correlated in terms of partial pressure in the permeate side, feed concentration and feed temperature. By using this correlation, the mass transfer resistance in the permeate side in gas sweeping pervaporation was evaluated and found to be affected by the gas flow rate and feed concentration. The observed diffusion fluxes of the permeable components in the permeate side were compared with the laminar boundary layer theory, and found a good agreement between the observed and theoretical values.Based on results of these experiments, a new method for the simulation of mass transfer in gas sweeping pervaporation with a flat membrane cell was developed. By using the calculated and observed data, the effects of gas flow rate on the resistance of mass transfer in the permeate side, the permeate flux and the separation factor were discussed.
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