摘要
采用原位水热合成的方法在管状α－ Ａｌ２ Ｏ３ 基膜上合成了 Ｓｉｌｉｃａｌｉｔｅ － １ 分子筛膜． Ｘ Ｒ Ｄ、 Ｓ Ｅ Ｍ、 Ｅ Ｄ Ｘ 和气体渗透等表征方法表明该膜没有裂缺．研究了原料液中乙醇浓度和渗透温度对乙醇／ 水渗透汽化分离的影响．研究发现，当温度为３０ ℃、原料液乙醇的摩尔分数为１ ．２ ％ 时，乙醇／水的分离系数为６０ ，透量为３ ．１ ｍｏｌ／（ ｍ ２·ｈ） ；温度升高，分离系数稍有下降，透量大大提高；当温度为６０ ℃、原料液乙醇浓度不变，乙醇／ 水的分离系数为４６ ，透量为１３ ．３ ｍｏｌ／（ ｍ ２·ｈ） ．原料液中乙醇浓度增加，乙醇／ 水的分离系数有一最大值；透量则随原料液中乙醇浓度的增加而降低．吸附－ 扩散机理很好地解释了实验结果．
Tubular Silicalite-1 zeolite membrane was synthesized on the α -Al 2O 3 support by in-situ hydrothermal synthesis method. XRD, SEM, EDX and gas permeation characterizations indicated that the as-synthesized membrane was crack-free. The influence of feed ethanol concentration and the separation temperature on the pervaporation separation performance was investigated. When the separation temperature was 30 ℃ and mole fraction of the feed ethanol was 1.2%, the separation factor and the flux were 60 and 3.1 mol/(m 2·h) respectively. As the separation temperature increased, the separation factor slightly decreased and the flux increased largely. When the separation temperature was 60 ℃ and mole fraction of the feed ethanol was 1.2%, the separation factor and the flux were 46 and 13.3 mol/(m 2·h) respectively. As the feed ethanol conentration increased, the separation factor had a maximum and the flux decreased. The experiment results can be explained by the sorption-diffusiion mechanism.
出处
《膜科学与技术》
CAS
CSCD
1999年第4期39-43,共5页
Membrane Science and Technology
基金
国家自然科学基金
关键词
分子筛膜
乙醇
水
渗透汽化
分离
膜分离
zeolite membrane ethanol/water pervaporation separation
