膜科学与技术

水硅比调控有机-无机杂化SiO2膜制备与乙酸脱水渗透汽化性能

作者：张子男，任秀秀，钟璟，徐荣，郭猛，吴梓豪，刘若妍

单位：常州大学石油化工学院，江苏省绿色催化材料与技术重点实验室，江苏常州213164

关键词：杂化硅膜；水硅比；渗透汽化；乙酸脱水

出版年,卷(期):页码： 2023,43(5):44-49

摘要：

以1,2-双（三乙氧基硅基）乙烷（BTESE）为硅源前驱体，通过酸催化溶胶-凝胶法制备了BTESE有机-无机杂化SiO2膜。为了提高其渗透汽化乙酸脱水性能，通过溶胶合成中水硅比（H2O/BTESE）对硅网络进行调控。随着水含量的增大，水解的Si-OH增多，形成的凝胶孔径得到了有效降低，在膜进行渗透汽化乙酸脱水中，分离因子增大，通量降低。水硅比为180制备出的BTESE膜具有最佳综合分离指数，75 ℃下渗透汽化分离90wt%乙酸/10wt%水溶液，渗透通量和分离因子分别为1.25 kg/(m2·h)和1050。将该膜分别浸泡在乙酸溶液和暴露在空气中，在长达80天的时间里膜的乙酸脱水分离性能基本保持稳定，具有较好的长期耐酸稳定性和耐氧化化学稳定性。

BTESE organic-inorganic hybrid silica membranes were prepared by acid-catalyzed sol-gel method using 1,2-bis(triethoxysilyl)ethane (BTESE) as the silica precursor. To improve its pervaporation acetic acid dehydration performance, the silica network was regulated by the water to BTESE molar ratio (H2O/BTESE) in the sol-gel synthesis. As the water content increased, the hydrolyzed Si-OH increased and the pore size of the formed gel was effectively reduced, which increased the separation factor and decreased the flux in the membrane for pervaporation acetic acid dehydration. The BTESE membrane prepared with a molar ratio of 180 of H2O/BTESE showed the best overall separation index, with pervaporation separation of 90wt% acetic acid/10 wt% aqueous solution at 75 ℃ with permeate flux and separation factor of 1.25 kg/(m2·h) and 1050, respectively. The membrane was immersed in acetic acid solution and exposed to air, and the acetic acid dehydration separation performance of the membrane remained basically stable for up to 80 days, with good long-term acid resistance and anti-oxidation chemical stability.

张子男（1997-），男，吉林辽源，硕士研究生，主要从事膜分离方面研究。

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