具有催化与渗透汽化双功能的纳米TiO2和Al2O3填充复合膜性能

采用聚丙烯腈(PAN)中空纤维超滤膜作为支撑底膜,经戊二醛(GA)表面交联的聚乙烯醇(PVA)作为渗透汽化层,以及纳米TiO2或Al2O3填充的全氟磺酸树脂(PFSA)作为催化层,制备了催化与渗透汽化双功能复合膜,考察了其亲水性能、对乙酸乙酯塔顶粗酯的渗透汽化分离性能、催化酯化反应性能以及机械性能.实验结果表明:催化与渗透汽化双功能复合膜具有良好的亲水性和机械性能,渗透通量可达到179g/(m2.h),相对应的分离系数为95,渗透物中不含乙酸乙酯,同时可显著缩短酯化反应达到相同转化率的时间.

Performances of catalytic and pervaporation difunctional composite membranes embedded with TiO2 (Al2O3) nano particles

PAN hollow fiber ultrafiltration membrane was used as support,PVA surface-crosslinked with GA was used to prepare pervaporation layer and PFSA embedded with TiO2 or Al2O3 nano particles was used as catalytic layer,to prepare catalytic and pervaporation difunctional composite membranes.Difunctional composite membranes were evaluated by dehydration of the top product(water,ethanol and ethyl acetate ternary azeotropic system) of reactive distillation,esterification of acetic acid with ethanol,hydrophilicity and mechanical performance.It was found that difunctional composite membranes had good mechanical and hydrophilicity properties,the permeation flux could reach to 179 g/(m2·h) with the separation factor of water to ethanol of 95,no ethyl acetate in the permeate,and the time to achieve the same conversion of esterification was remarkably reduced than blank control.