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采用二次生长法,通过在α-Al_2O_3载体管表面热浸渍涂晶,在摩尔比为n(SiO_2):n(Al_2O_3):n(Na_2O):n(K_2O):n(H_2O)=54.0:1.0:15.5:5.3:863.2的清液体系中制备了T型分子筛膜。通过X射线衍射和扫描电子显微镜对合成膜的结构和形貌进行了表征,研究了大小晶种匹配方式﹑晶种浓度、晶化时间和晶化温度对T型分子筛膜性能的影响。结果表明:第1次预涂浓度为10 g/L大晶种,第2次预涂浓度为5 g/L小晶种,合成温度为155℃,合成时间为6 h时,在清液体系中可成功制备T型沸石膜;将合成得到的T型分子筛膜用于70℃渗透汽化分离90%异丙醇-水体系,其渗透通量和分离因数分别可达到1.40 kg/(m~2·h)和2 318。
The surface morphology of the α-Al 2 O 3 support tube was investigated by hot dip coating on the surface of α-Al 2 O 3 carrier tube with a molar ratio of n (SiO 2): n (Na 2 O): n (K 2 O): n (H 2 O) = 54.0: T-type molecular sieve membranes were prepared in a clear liquid system of 1.0: 15.5: 5.3: 863.2. The structure and morphology of the synthesized films were characterized by X-ray diffraction and scanning electron microscopy. The effects of size and seed matching, seed concentration, crystallization time and crystallization temperature on the properties of T-type zeolite membranes were studied. The results showed that when the first seed coating was 10 g / L, the second seed coating was 5 g / L, the synthesis temperature was 155 ℃ and the synthesis time was 6 h, T zeolite membrane can be successfully prepared; the permeation flux and separation factor of T zeolite membranes synthesized by pervaporation at 70 ℃ for 90% isopropanol-water system can reach 1.40 kg / (m ~ 2 · H) and 2 318.