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晶种溶胶法LTA型分子筛膜的制备及乙醇脱水性能研究

作者：黎徐乐，宗少峰，李璘喆，杨建华，鲁金明

单位：大连理工大学吸附与无机膜研究所精细化工国家重点实验室, 大连 116024

关键词： LTA型分子筛膜；渗透蒸发；乙醇脱水；晶种溶胶法

DOI号： 10.16159/j.cnki.issn1007-8924.2025.05.002

分类号： TQ028.8

出版年,卷(期):页码： 2025,45(5):9-18

摘要：

? LTA型分子筛膜具有规则骨架、孔道结构和高亲水性，使其在有机溶剂脱水领域受到广泛关注。本研究在200 mm长的大孔α-Al2O3载体上擦涂预先配置的LTA晶种溶胶得到致密的晶种层，并采用二次生长法与低碱度合成母液制备了高性能的LTA膜。重点考察了反应釜有无聚四氟乙烯内衬、晶种溶胶水硅比、晶化时间、合成液陈化时间和烘箱转速对LTA膜形貌与分离性能的影响。在最优条件下制备的LTA膜对于348.15 K 90%（质量分数）乙醇/水体系的分离表现出2.23 kg/(m2·h)的通量，同时分离因子达到了22 050，显示出一定的应用潜力。

?? LTA-type zeolite membranes have attracted significant attention in organic solvent dehydration due to their ordered pore structure and high hydrophilicity. In this study, a dense seed layer was achieved by rubbing a pre-synthesized LTA seed sol onto a 200 mm macroporous α-Al2O3 support, followed by the fabrication of high-performance tubular LTA zeolite membranes via a secondary growth method. The effects of synthesis parameters were systematically investigated to optimize the LTA zeolite membrane morphology and separation performance, including the presence or absence of a PTFE liner in the autoclave, water-to-silica ratio in the seed sol, crystallization time, aging time of the synthesis solution, and rotation speed of the oven. Under optimal conditions, the tubular LTA zeolite membrane exhibited a high flux of 2.23 kg/(m2·h) and an ultrahigh separation factor of 22 050 for dehydrating 90% (mass fraction) ethanol/water at 348.15 K. These results highlight the exceptional potential of as-synthesized LTA membranes for scale-up industrial applications in solvent dehydration processes.

基金项目：

国家自然科学基金(22378044); 国家重点研发计划(2023YFB3810700)

作者简介：

黎徐乐(2004-)，女，湖北通城人，研究方向为微孔分子筛膜的制备与应用

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