新型CO_2分离膜的气体吸着性能

引　言石油气和天然气中含有的大量ＣＯ2 直接影响以这些气体为原料的产品质量 ,并对管线和设备造成腐蚀 .同时 ,由于ＣＯ2 等气体导致的温室效应已引起严重后果 .因此 ,如何分离或脱除ＣＯ2 成为人们的研究热点 .采用膜技术分离气体由于具有节约能源、操作简便等优点已得到了很大的发展[1～ 3] .最初用于气体分离的主要膜材料多为普通高分子聚合物 ,如醋酸纤维素、聚酰亚胺等 .至今这些膜材料仍在不断的开发和应用 .但由于Ｒｏｂｅｓｏｎ上限[4 ] 的存在 ,使其很难同时具有高选择性和高透过率 ,研制新型膜材料是解决此问题的一个重要途径 .…

GAS SORPTIVE PROPERTY OF NOVEL MEMBRANE USED FOR CO_2 SEPARATION

A new polymeric membrane material-polyvinylamine (PVAm), which contains amino-groups facilitating the transport of CO 2 in the membrane, has been developed. A composite membrane used for CO 2 separation was made up by covering a PS basis membrane with the polyvinylamine. Sorption of CO 2 on the PVAm-PS composite membrane and the PS basis membrane was measured by using the volumetric method. The results show that the composite membrane has very high CO 2 sorption capacity, and this sorption capacity arises mainly from the PVAm layer. Temperature has much impact on the sorption, the sorption capacity drops sharply when temperature increases. The sorption mechanism is analyzed. It is deduced that there are physical and chemical interaction simultaneously between the composite membrane and CO 2. The membrane has no obvious sorption for CH 4, N 2 and H 2.