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通过溶胶-凝胶热涂法制备高通量的微孔二氧化硅分子筛膜,并将其应用于渗透蒸发乙酸脱水,评价二氧化硅分子筛膜的分离性能;利用粒度分析仪和SEM对溶胶和膜层进行表征.结果表明,溶胶中二氧化硅颗粒的直径为10～80nm,无定形微孔二氧化硅分子筛膜对该体系显示了优异的分离性能,在353K时渗透蒸发分离水质量分数为5%的乙酸水溶液时,通量为0.65kg/(m2.h),分离系数达到120,经过35h的渗透蒸发实验后分离系数增高到160左右,通量基本不变为0.60kg/(m2.h).
High-throughput microporous silica molecular sieve membranes were prepared by sol-gel thermal coating and applied to the dehydration of acetic acid by pervaporation to evaluate the separation performance of silica molecular sieve membranes. The effects of sol and The results show that the diameter of the silica particles in the sol is 10 ~ 80nm, the amorphous microporous silica molecular sieve membrane shows excellent separation performance for the system, and the pervaporation separation water mass fraction at 353K is 5% acetic acid aqueous solution, the flux was 0.65kg / (m2.h), the separation coefficient reached 120. After 35h, the separation coefficient increased to about 160 after pervaporation experiment, and the flux basically remained unchanged at 0.60kg / (m2. h).