摘要：针对乙酸乙酸渗透汽化脱水，以自制PAN中空纤维超滤膜为底膜，PFSA共混改性材料，以酒石酸(Tac)，马来酸(Mac)为交联剂，制备了酒石酸(Tac)交联PVA/PAN渗透汽化复合膜、马来酸(Mac)交联PVA/PAN渗透汽化复合膜、Tac交联PVA-PFSA/PAN渗透汽化复合膜、Mac交联PVA-PFSA/PAN渗透汽化复合膜，以及采用溶胶-凝胶法制备了PFSA-TEOS/PAN渗透汽化复合膜.以聚丙烯腈(PAN)中空纤维超滤膜为底膜，以酒石酸(Tac)为交联剂，制备了聚乙烯醇(PVA)与全氟磺酸(PFSA)共混复合膜，并用于乙酸乙酯/水、乙酸乙酯/乙醇/水溶液的脱水研究。考察了分离乙酸乙酯/水二元溶液时，料液温度和水含量对复合膜分离性能的影响，40℃下分离含水质量分数2%的乙酸乙酯水溶液时，其总渗透通量和分离因子分别为81.1 g/(m2·h)和1890。另外，复合膜用于分离乙酸乙酯/乙醇/水(90/2/8(质量分数)三元溶液时，考察了料液温度的影响及脱水效果，40℃时复合膜对三元溶液的总渗透通量可达251.0 g/(m2·h)，此温度下，12h可将初始含水质量分数为8%的三元溶液脱水至4.66%.PVA-PFSA/PAN复合膜对乙酸乙酯体系的脱水效果良好，可应用于渗透汽化强化乙酸乙酯酯化生产工艺。利用Aspen Plus 11.1软件对工艺流程进行了模拟，模拟结果表明，在同等操作条件下，渗透汽化强化酯化工艺流程相对于普通的反应精馏，提高了乙酸乙酯的单程收率和原料的转化率，同时也简化了乙酸乙酯生产流程。
摘要：Ultra-fine silicalite-1 particles were modified with two kinds of chlorosilanes (dodecyltrichlorosilane and octyltrichlorosilane)and characterized with FI-IR，TGA，contact angle measurements and BET analysis. It was found that the surface hydrophobicity of silicalite-1 particles was improved significantly，with contact angle increasing from 16.4°(unmodified silicalite1)to 122.0°(modified silicalite-1 with dodecyltrichlorosilane). Modified silicalite-1 particles were incorporated into PDMS (poly (dimethylsiloxanediol))membranes，which were applied for the pervaporation of ethanol/water mixtures. The effect of zeolite loading and operation conditions on pervaporation performance of the membranes was investigated in detail. The separation factor of PDMS membranes filled with modified silicalite-1 increased considerably compared with that filled with unmodified ones，and the total flux decreased with increasing zeolite loading. The sorption and diffusion selectivity of filled membranes were also measured to explain the pervaporation properties of silicalite-1 filled PDMS membranes. It was found that modification of silicalite1 with dodecyltrichlorosilane effectively improved the sorption and diffusion selectivity of silicalite-1 filled PDMS membranes with high zeolite loading. This may be attributed to the high surface hydrophobicity of modified silicalite-1 and its good integration with PDMS membranes.Both of the high separation factor and sorption selectivity indicated that modification of silicalite-1 with chlorosilanes was an effective method to improve the selectivity of the zeolite filled PDMS membranes for ethanol/water mixtures.
