以甲基三乙氧基硅烷(MTES)和1,8-二(三乙氧基硅基)辛烷(BTESO)为前驱体,通过溶胶-凝胶法制备杂化硅溶胶,即Me-BTESO溶胶。采用Me-BTESO溶胶对纯硅分子筛Silicalite-1膜进行改性,利用MTES中的甲基,提高膜的疏水性,从而提高分离因子。同时利用BTESO长而柔软的C8烷基链,减小乙醇的传输阻力,提高膜的通量。在60℃,5%(质量分数)乙醇/水溶液中,Me-BTESO/Silicalite-1分子筛膜具有较高的通量[约3.0kg/(m2·h)]和适中的分离因子(9.8),渗透汽化分离指数高达29.4kg/(m2·h)。基于MTES高疏水性和BTESO的柔性结构,将制备的Me-BTESO溶胶修饰Silicalite-1分子筛膜表面,表现出优异的疏水性和良好的乙醇选择性,对于乙醇-水体系的分离具有良好的应用前景。
A hybrid silica sol,namely Me-BTESO sol,was prepared by sol-gel method using methyl trichlorosilane (MTES) and 1,8-bis (triethoxysilyl) octane (BTESO) as precursors.The Me-BTESO sol was employed to modify pure silicalite-1 membrane,where the methyl group in MTES increased the hydrophobicity of the membrane,thereby improving its separation factor.At the same time,the long and soft C8 alkyl chain of BTESO reduced the transport resistance of ethanol and increased the flux of the membrane.The silicalite-1 membrane modified by Me-BTESO sol had high flux [about 3.0kg/(m2·h)] and moderate separation factor (9.8) in 5wt% ethanol/water solution at 60℃,and the pervaporation separation index reached 29.4kg/(m2·h).Based on the high hydrophobicity of MTES and the flexible structure of BTESO,the prepared Me-BTESO sol was used to modify the surface of silicalite-1 membrane,showing excellent hydrophobicity and good ethanol selectivity,which has a good application prospect for the separation of ethanol-water system.
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基金资助
中国石油化工股份有限公司资助项目(224088)
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