Abstract

Sorption and pervaporation experiments were carried out for pure ethanol, pure ethyl acetate and their binary mixtures using zeolite 13X-filled poly(dimethylsiloxane) membranes prepared by the solution–casting method. The sorption values increased in proportion with the amount of ethyl acetate in the mixtures. The excess Gibbs free energies and values of the activity coefficients calculated with the UNIFAC method were used simultaneously to determine the binary interaction parameters for the ethyl acetate–ethanol mixture. The effects of temperature and feed concentration on the flux and selectivity values were investigated. The total fluxes increased in proportion to the amount of ethyl acetate in the feed. However, the selectivity decreased due to the coupling effect. The prepared membranes were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM).

摘要

使用溶液浇铸法制备的沸石 13X 填充聚（二甲基硅氧烷）膜对纯乙醇、纯乙酸乙酯及其二元混合物进行吸附和渗透蒸发实验。吸附值与混合物中乙酸乙酯的量成比例增加。过量的吉布斯自由能和用 UNIFAC 方法计算的活度系数值同时用于确定乙酸乙酯-乙醇混合物的二元相互作用参数。研究了温度和进料浓度对通量和选择性值的影响。总通量与进料中乙酸乙酯的量成比例增加。然而，由于耦合效应，选择性降低。