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无氟体系制备高性能T型分子筛膜

作者：李璘喆，路颖，杨建华，鲁金明，张艳

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： T型沸石膜；渗透蒸发；异丙醇脱水；无氟合成

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2021,41(5):43-50

摘要：

T型分子筛膜兼具亲水性与耐酸性潜力，在有机溶剂脱水领域极具优势。本文通过大小晶种匹配的方法在粗糙大孔管状载体上制备了连续平整的晶种层，进而通过无氟路线合成出了高选择性T型分子筛膜，并重点考察了搅拌与晶化方式、硅源、水硅比对T膜形貌与性能的影响。最优条件下制备的T膜用于分离75℃ 90 wt.%异丙醇/水混合体系，通量达到了4.30 kg·m-2·h-1，分离因子大于10000，在180 h测试期内分离性能保持稳定。结果表明，无氟体系制备T型分子筛膜具有重要的应用价值。

Zeolite T membrane has an important application prospect in pervaporation because of its suitable framework Si/Al ratio and the effective pore size between most organic molecules and water. In this paper, dense and smooth seed layer was prepared on rough macroporous alumina support tube by the method of matching the size of seed. Then, high-performance pure phase zeolite T membrane was fabricated by fluorine-free synthesis. The effects of stirring and crystallization methods, silicon source and water silicon ratio on zeolite T membranes were investigated. The membranes prepared by fluorine-free route were used for the pervaporation test of 90 wt.% isopropanol/water solution at 348 K. The average flux was 4.21 ± 0.09 kg·m-2·h-1 with an average separation factor of more than 10000 and showed hydrothermal stability for more than 180 h. The stable flux was about 3.82 kg·m-2·h-1, and the permeate's water content remained 100%. These results showed that the process of preparing zeolite T membranes with a fluorine-free system is green and environmentally friendly, with excellent membrane-forming efficiency and excellent performance, which has great potential for industrial applications.

基金项目：

国家自然科学基金（21776032）

作者简介：

李璘喆（1995—），男，黑龙江省依兰县，硕士研究生，研究方向为微孔分子筛膜的制备与应用。E-mail：942722321@qq.com。

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