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Seed sol-assisted fabrication of LTA zeolite membranes for ethanol dehydration

Authors： LI Xule, ZONG Shaofeng, LI Linzhe, YANG Jianhua, LU Jinming

Units： State Key Laboratory of Fine Chemicals, Institute of Adsorption and Inorganic Membrane, Dalian University of Technology, Dalian 116024, China

KeyWords： LTA zeolite membrane; pervaporation; ethanol dehydration; seed sol-assisted method

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2025,45(5):9-18

Abstract：

?? 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.

Funds：

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

AuthorIntro：

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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