热浸渍预涂晶种温度对T型分子筛膜性能的影响

Influence of Hot Dipping Temperature of Pre-Coated Seed on Performance of T-Type Zeolite Membranes

通过热浸渍法在α-Al2O3载体管表面预涂晶种,进而制备得到T型分子筛膜,通过XRD和SEM技术对其进行了表征,并在90%（w）异丙醇-10%（w）水体系中评价了T型分子筛膜的渗透汽化性能,考察了第二次涂晶温度和合成时间对T型分子筛膜的形成和分离性能的影响以及T型分子筛膜的重复性。实验结果表明,两次涂晶温度分别为180℃和100℃以及T型分子筛膜的晶化时间为24 h时,所制备的T型分子筛膜在70℃、90%（w）异丙醇-10%（w）水体系中进行渗透汽化性能测定,渗透通量基本大于1.20 kg/（m2·h）、分离因子为3 000-3 600,具有很高的重复性。通过优化第二次涂晶温度及合成时间,能合成出高通量、高重复性的T型分子筛膜。

T-type zeolite membranes were prepared by hot dipping to pre-coat the zeolite crystal seed on α-Al2O3 support,and characterized by means of XRD and SEM. The pervaporation performance of the T-type zeolite membrane in the 90%（w）isopropanol-10%（w）water system was investigated. The effects of the second pre-coating temperature and synthesis time on the formation and separation performance of the T-type zeolite membranes,and the membranes＇ reproducibility were studied. The results showed that when the twice pre-coating temperatures were 180 ℃ and 100 ℃ respectively and the synthesis time was 24 h,the permeation flux and the separation factor of the membranes prepared reached more than 1.20 kg/（m2·h） and 3 000-3 600 in the 90%（w）isopropanol-10%（w）water system at 70 ℃,with good reproducibility.