氨基聚芳醚的合成及其CO_(2)/N_(2)分离性能

Synthesis of amino poly(arylene ether)and their CO_(2)/N_(2)separation performance

烟道气碳捕集对于减缓温室效应和实现“双碳”目标具有重要意义.作为第二代碳捕集技术,高性能膜材料研发是膜法碳捕集(CO_(2)/N_(2)分离)技术大规模应用的基础.引入与CO_(2)具有亲和性的氨基基团,提高CO_(2)渗透选择性,是获得高性能CO_(2)/N_(2)分离膜材料的有效途径之一.采用溶液缩聚法,利用具有CO_(2)亲和性的9,9-双-(4-氨苯基)-2,7-二羟基芴(BADHF)和4-(4-羟基苯基)-2,3-二氮杂萘-1-酮(DHPZ)为单体,通过调整BADHF和DHPZ单体的摩尔比,合成了一系列不同氨基含量的氨基聚芳醚,并对其化学结构、分子量和热性能进行分析表征.采用溶剂蒸发法制备氨基聚芳醚均质膜,探究氨基含量和温度对CO_(2)、N_(2)气体渗透行为的影响.结果表明,CO_(2)和N_(2)在氨基聚芳醚中的渗透系数都可由Arrhenius方程描述.随氨基含量增大,CO_(2)和N_(2)的渗透系数下降,CO_(2)/N_(2)选择性则先增大后降低,BADHF和DHPZ摩尔比为8∶2合成的氨基聚芳醚的分离性能最佳,CO_(2)/N_(2)选择性达到20.25.

The post-combustion carbon dioxide capture is essential for the mitigation of the global greenhouse effect and achieving‘carbon emission peak’and‘carbon neutrality’.As the second-generation carbon capture technology,the development of high-performance membrane materials is the basis for the large-scale application of membrane-based carbon capture(CO_(2)/N_(2)separation).The CO_(2)permselectivity could be improved by the addition of CO_(2)-philic groups,which is one of the most promising methods for the developments of high performance membrane materials for CO_(2)/N_(2)separation.In this work,9,9′-bis-(4-aminophenyl)-2,7-dihydroxyfluorene(BADHF)of CO_(2)-philicity and 4-(4-hydro xyphenyl)-2,3-pthalzine-1-one(DHPZ)was used as monomer to synthesize the amino poly(arylene ether)with various molar ratios of BADHF and DHPZ.The chemical structure and thermal properties of amino poly(arylene ether)were characterized.The homogeneous amino poly(arylene ether)membranes were prepared by the solvent evaporation method.The effects of amino content and temperature on the gas permselcetivity were investigated.The CO_(2)and N_(2)permeability of amino poly(arylene ether)could be correlated by the Arrhenius equation.With the increase of amino content,the CO_(2)and N_(2)permeability reduced,CO_(2)/N_(2)selectivity increased first and then decreased.When the molar ratio of BADHF and DHPZ was 8∶2,the amino poly(arylene ether)had the best CO_(2)/N_(2)separation performance with CO_(2)/N_(2)selectivity of 20.25.