膜科学与技术

以3-甲氧基苄胺改性聚乙烯基胺制备CO2分离膜

作者：王树清，乔志华，王志

单位：天津大学化工学院化学工程研究所，天津化学化工协同创新中心，化学工程联合国家重点实验室（天津大学），天津市膜科学与海水淡化技术重点实验室，天津 300072

关键词：固定载体膜；3-甲氧基苄胺；CO2/N2分离因子；CO2渗透速率

出版年,卷(期):页码： 2016,36(3):1-7

摘要：

为提高CO2分离膜高压下的渗透选择性能，利用含苯环小分子胺3-甲氧基苄胺与聚乙烯基胺（PVAm）制备了PVAm-3-甲氧基苄胺涂膜液，并将PVAm-3-甲氧基苄胺涂膜液涂敷到聚砜（PSf）超滤膜上制备了PVAm-3-甲氧基苄胺/PSf固定载体复合膜。PVAm-3-甲氧基苄胺/PSf膜的红外谱图结果显示，3-甲氧基苄胺的伯胺基能与PVAm的伯胺基或酰胺基形成氢键交联网络。利用模拟烟道气组成的CO2/N2混合气（20/80）考察了PVAm-3-甲氧基苄胺/PSf膜和PVAm/PSf膜的渗透选择性能。结果表明，PVAm-3-甲氧基苄胺/PSf膜的CO2渗透选择性能得到了大幅度提高，尤其是在高压下，这是由于该膜具备以下三个结构特征。第一，由于膜内3-甲氧基苄胺和PVAm之间形成了分子间氢键，膜变得致密；第二，膜内胺基浓度大量增加；第三，膜内引入了大量醚氧基团。

To improve the permeance and selectivity of CO2 separation membrane at high pressure, polyvinylamine (PVAm)-3-methoxyl benzyl amine coating solution was prepared by mixing PVAmaqueous solution with 3-methoxy benzyl amine. The PVAm-3-methoxyl benzyl amine/polysulfone (PSf) fixed carrier composite membrane was prepared by coating PVAm-3-methoxyl benzyl amine solution on the PSf membrane. The ATR-FTIR spectra of the membrane showed that the intermolecular hydrogen bonds are formed between the primary amine groups of 3-methoxyl benzyl amine and primary amine or amide groups in PVAm. CO2 permeance and CO2/N2 selectivity of the PVAm-3-methoxyl benzyl amine/PSf and PVAm/PSf membranes were tested by using CO2/N2 mixed gas (20/80 by volume). The PVAm-3-methoxyl benzyl amine/PSf membrane displays high CO2/N2 separation performance, especially at high pressure, which is attributed to three structural characteristics of the membrane. Firstly, the membrane was densified due to the intermolecular hydrogen bonds formed between PVAm and 3-methoxy benzyl amine. Secondly, the amine group concentration of the membrane was increased. Thirdly, the ether oxygen groups were introduced into the membrane.

王树清（1965-），男，天津，学士，中级工程师

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