以多次原位水热法合成Ge-ZSM-5分子筛膜及其渗透蒸发性能的研究

发布时间：2018-05-07 21:51

  本文选题：Ge-ZSM-分子筛膜 + 渗透蒸发　； 参考：《应用化工》2017年01期

【摘要】：在α-A1_2O_3载体上,通过多次原位水热合成制备Ge-ZSM-5分子筛膜,并利用渗透蒸发膜分离技术从乙酸/水溶液中分离乙酸。考察了晶化时间和合成液中Ge含量对膜的结构和性能的影响。在溶胶物质的量组成为Ge(C_2H_5O)_4∶SiO_2∶TPAOH∶H_2O=1∶x∶5.13∶2 246(x=100,25)的合成液中,经过3次水热晶化,所得的膜均为致密膜,膜的分离因子随温度的升高而增加,渗透通量受温度影响不大。在Si/Ge=25的溶胶中,一次原位水热晶化24 h,二次原位水热晶化18 h,三次原位水热12 h合成的膜质量最优,对5%乙酸水溶液,在90℃时,分离因子可达2.0,此时渗透通量为0.8 kg/(m2·h)。
[Abstract]:Ge-ZSM-5 molecular sieve membranes were prepared on 伪 -A12O3 carrier by in situ hydrothermal synthesis, and acetic acid was separated from acetic acid / aqueous solution by pervaporation membrane separation technique. The effects of crystallization time and GE content on the structure and properties of the films were investigated. After three hydrothermal crystallization, the membranes were all dense membranes, the separation factors of the membranes increased with the increase of temperature, and the permeation flux was not affected by temperature. In the sols of Si/Ge=25, the membrane mass was optimized by in situ hydrothermal crystallization for 24 h, in situ for 18 h, and for 3 times for 12 h. For 5% acetic acid aqueous solution, the separation factor was 2.0 at 90 鈩，

本文编号：1858576