聚醚共聚酰胺复合气体分离膜对CO_2/N_2分离性能的研究  

Poly (amide-6-b-ethylene oxide) composite membranes for CO_2/N_2 separation

作　　者：任晓灵[1] 任吉中[1] 李晖[1] 邓麦村[1] 

机构地区：[1]中国科学院大连化学物理研究所膜技术国家工程研究中心,大连116023

出　　处：《膜科学与技术》2012年第5期8-12,共5页Membrane Science and Technology

基　　金：国家科技支撑计划(2011BAC08B01)

摘　　要：以烟道气中CO2的捕集为研究背景,以聚醚共聚酰胺Pebax1657嵌段共聚物为选择层膜材料,采用浸渍涂覆法,制备具有超薄分离皮层的PEI/PDMS/Pebax1657/PDMS多层复合气体分离膜,研究复合气体分离膜对CO2/N2混合气的分离特性.由于CO2的增塑作用,复合膜对CO2/N2混合气的分离系数为40左右,低于其理想分离系数.操作压力和原料气中CO2浓度对复合膜的渗透分离性能以及混合气的分离效果影响显著.在实际应用中,可通过调节膜两侧操作压力来提高CO2的富集浓度.In this paper, poly （amide-6-b-ethylene oxide） （Pebax1657） copolymer is used to prepare the ultra thin muhilayer polyetherimide （ PEI）/polydimethylsilicone （PDMS）/Pebax1657/PDMS composite membranes by dip-coating method for the separation of COz from flue gas. The performance of the multilayer composite membranes for CO2/N2 separation is investigated. Due to the CO2 induced plasticization effect, the CO2/N2 selectivity is lower than the ideal selectivity of the multilayer composite membranes. The operating pressure and the CO2 concentration of feed gas have a great influence on the performance of the multilayer composite membranes for CO2/N2 separation. In practical, the enriched CO2 concentration can be controlled by adjusting the ratio of feed pressure to permeate pressure.

关 键 词：CO2/N2混合气 多层复合膜 聚醚共聚酰胺 

分 类 号：TQ028.8[化学工程]