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管状Silicalite-1分子筛膜的乙醇/水渗透汽化分离性能
Pervaporation separation properties of ethanol/water mixture through tubular Silicalite-1 zeolite membrane
【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.
【Abstract】 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.
- 【文献出处】 膜科学与技术 ,MEMBRANE SCIENCE AND TECHNOLOGY , 编辑部邮箱 ,1999年04期
- 【被引频次】19
- 【下载频次】302