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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

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【作者】 徐晓春杨维慎刘杰赵毅超房廉清林励吾

【Author】 Xu Xiaochun, Yang Weishen, Liu Jie, Zhao Yichao, Fang Lianqing, Lin Liwu (State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023)

【机构】 中国科学院大连化学物理研究所催化基础国家重点实验室!大连116023中国科?

【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.

【基金】 国家自然科学基金
  • 【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
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