A hydrophobic pervaporation membrane with hierarchical microporosity for high-efficient dehydration of alcohols
A hydrophobic pervaporation membrane with hierarchical microporosity for high-efficient dehydration of alcohols
复制标题
一种具有分级微孔的疏水性渗透汽化膜，用于醇的高效脱水
DOI：
10.1016/j.ces.2019.05.057
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发表时间：
2019-10-12
影响因子：
4.7
通讯作者：
Liu, Qinglin
中科院分区：
文献类型：
--
作者：
Liu, Peng;Chen, Mengmeng;Liu, Qinglin
渗透汽化是一种很有前途的分离有机水溶液的膜技术，特别是对非水溶性和近沸点化合物的分离。然而，大多数渗透蒸发膜是基于亲水性聚合物，遭受的分离性能下降，由于其在水溶液中的溶胀。本文提出了一种通过刚性链段和柔性链段相结合的共聚物合成策略来制备具有分级孔隙率的疏水聚合物渗透汽化膜。该膜具有良好的微孔结构和高达8.03%的自由体积分数，空腔尺寸为0.476 nm，对醇类脱水具有良好的渗透性和选择性。在30 ℃时，该膜对乙醇-水共沸物的渗透汽化通量为74.6 μ m·kg·m ~（-2）·h ~（-1），水选择性为34（分离因子为732）。所开发的策略具有很好的潜力，用于合成共聚物的高效渗透蒸发膜。(C)2019爱思唯尔有限公司版权所有。
Pervaporation is a promising membrane technology for separation of aqueous organic solution particularly azeotrope and close-boiling point compounds. However, most of pervaporation membranes are based on hydrophilic polymers that suffer decline of separation performance due to their swelling in aqueous solution. Here we present a copolymer synthetic strategy for preparation of hydrophobic polymer pervaporation membrane with hierarchical porosity via uniting both rigid and flexible segments. The synthesized membrane has well-defined micropores and high free volume faction of 8.03% with cavity size of 0.476 nm, and demonstrate exceptional performance with high permeability and selectivity for dehydration of alcohols. In the pervaporation of ethanol-water azeotrope, the membrane displays the high permeabtion flux of 74.6 mu m kg m(-2) h(-1) and water selectivity of 34 (separation factor of 732) at 30 degrees C. The developed strategy has excellent potential for synthesizing copolymers for high-efficient pervaporation membranes. (C) 2019 Elsevier Ltd. All rights reserved.