T型分子筛膜的制备及其对含酸乙腈-水的分离性能

石化医药行业会产生大量乙腈废液,通过无机分子筛膜分离技术进行回收可以创造可观的经济价值。然而,乙腈废液水含量较高,并且具有一定的酸性,目前应用比较广泛的NaA型分子筛膜不能在该体系下长期使用。使用自制的平均粒径为600 nm的T型分子筛作为晶种,采用真空涂敷法将晶种负载在α-Al₂O₃载体管表面,在150 ℃下水热晶化16 h制备出T型分子筛膜,并对其做膜性能评价实验。结果表明,自制的T型分子筛膜在进料流量为3.5 L/h、温度为100 ℃条件下对含有1%（质量分数）乙酸和10%水（质量分数）的乙腈混合溶液进行膜分离脱水实验,渗透通量为2.51 kg/（m ²·h）;在120 h长时间运行过程中,分离系数保持在2 250以上,T型分子筛膜性能基本保持不变。

Preparation of T-type zeolite membrane and its separation performance on acetonitrile-water containing acid

A large amount of acetonitrile waste liquid will be produced in petrochemical and pharmaceutical industries,which can be recovered by inorganic molecular sieve membrane separation technology to create considerable economic value.Howe-ver,acetonitrile waste liquid has high water content and acidity.NaA zeolite membrane can not be used in this system for a long time,which is widely used at present.The self-made T-type zeolite with an average particle size of 600 nm was used as crystal seed.The crystal seed was loaded on the surface of α-Al₂O₃ carrier tube by vacuum coating method.The T-type zeolite membrane was prepared by hydrothermal crystallization at 150 ℃ for 16 h.And pervaporation evaluation experiments were carried out.The results showed that the pervaporation dehydration of acetonitrile mixed solution containing 1%（mass fraction）acetic acid and 10%（mass fraction） water was carried out by self-made T-type zeolite membrane at 100 ℃.The permeation flux was 2.51 kg/（m ²·h）.During 120 h operation,the separation factor maintained above 2 250,and the performance of T-type zeolite membrane remained basically unchanged.