Zhongyi (School ofChemical Engineering andTechnology,Tianjin University,Tianjin300072,China) Abstract:In thispaper,the mass transferprocess ofbinary aqueous solutionsthrough pervaporation membrane isstudied Amodified solution—diffusionmodel isestablished based on Flory—Huggins solutiontheory and Fu— jita’S freevolume theory.The effectsof tomponent ponent concentration,temperature,proper— tvofmembrane materlaIandpermeate on the n琵_Sstransfer ate discussed The ponent concentr8一 tion on the interaction parameter ponents,the membrane material On thesolutionselectivity to— wards water,as well asconcentration,temperature,and membrane thickness on thepermeation fluxandsepa— rationfactor are investigated. Key wolds:pervaporation;modified solution—diffusion model;methanol aqueous solution;polyimide
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