膜接触器分离混合气中二氧化碳的研究  

Separation of Carbon Dioxide from Gas Mixture by Membrane Contactor

作　　者：朱宝库[1] 陈炜[1] 王建黎[1] 徐又一[1] 徐志康[1] 

机构地区：[1]浙江大学高分子科学研究所,杭州310027

出　　处：《环境科学》2003年第5期34-38,共5页Environmental Science

基　　金：国家自然科学基金重点项目 (5 983312 0 ) ;国家 86 3计划项目(2 0 0 2AA5 2 92 0 0 )

摘　　要：研究了聚丙烯纤维微孔膜 (HFPPM )膜接触器分离CO2 /N2 混合气中CO2 技术 ,考察了吸收剂的种类、HFPPM的透气率和流程等因素对CO2 分离效率的影响 .结果表明 ,液相中传质在分离过程中占主导作用 ;3种吸收剂的性能依次为单乙醇胺 (MEA) >NaOH >二乙醇胺 (DEA) .以浓度 2 5mol·L- 1、流速 4 0～ 1 6 0L·h- 1的MEA水溶液处理浓度 2 0 %、流速 0 5～ 1 0m3 ·h- 1的CO2 /N2 混合气时 ,CO2 的脱除率为 95 %～ 99 5 %,CO2 的传质系数为 4 5～ 6 8× 1 0 - 4m·s- 1;透气率大的膜组件传质系数大 ,腔流程中CO2 的脱除率比壳流程高 30 %以上 .In this paper, membrane contactor made of hydrophobic hollow fiber polypropylene porous membrane (HFPPM) was used for separating carbon dioxide (CO 2) from CO 2/N 2 mixtures. The effects of absorbents, concentration and flow rate of feeding gas and absorbent solution, lumen/shell side processes and gas permeability of HFPPM(P)on the CO 2 absorption efficiency were investigated. It was found that the absorption efficiency of three absorbents ranged in order of ethanolamine >sodium hydroxide> diethanol amine. For CO 2/N 2 mixture of c in=20 % and v in = 0.5～1.0 m 3·h -1, and MEA solution of c MEA=2.5 mol·L -1 and v L= 40～160L·h -1, the removal efficiencies of CO 2 (η) and the mass transport coefficients (K) was 9 5%～ 99.5% and 4.5～6.8×10 -4 m·s -1 respectively. K of the modules made of HFPPM with larger P was relatively larger. η in lumen process was 30% larger than that in shell process.

关 键 词：CO2脱除率 CO2传质系数 聚丙烯中空纤维膜 膜接触器 

分 类 号：TQ028.8[化学工程] X705[环境科学与工程—环境工程]