用于CO_2吸收的离子液体的合成、表征及吸收性能  

Synthesis,Characterization and Absorption Efficiency of an Ionic Liquid for the Absorption of CO_2

作　　者：吴永良[1] 焦真[1] 王冠楠[1] 吴有庭[1] 张志炳[1] 

机构地区：[1]南京大学化学化工学院,江苏南京210093

出　　处：《精细化工》2007年第4期324-327,340,共5页Fine Chemicals

基　　金：江苏省自然科学基金项目(BK2005077)

摘　　要：以N-甲基咪唑和3-溴丙胺氢溴酸盐为起始原料,合成了一种含氨基的离子液体(ionic liquid,IL)——1-(1-氨基丙基)-3-甲基咪唑溴盐(简写为[NH2p-mim]Br),总产率为90.1%,溴含量为0.980 mol Br/mol IL,胺含量为0.948 mol NH2/mol IL。探讨了合成工艺,并通过1HNMR、13CNMR、IR和MS对产物结构进行了表征。吸收实验结果表明,该离子液体能够有效地吸收CO2,在40℃和106 kPa下,质量分数为45%的离子液体水溶液吸收CO2至饱和时,溶液中CO2的摩尔分数可达0.444 mol CO2/mol IL,接近理论吸收量0.5 mol CO2/mol IL;在90℃的真空状态下,吸收的CO2能够完全解吸,重复吸收实验表明,该离子液体吸收CO2的能力无明显下降。An ionic liquid （ IL）, 1-（ 1-aminopropyl ）-3-methylimidazolium bromide, was synthesized using N-methylimidazole and 3-bromopropylamine hydrobromide as raw materials, the final yield was 90. 1% , the bromide content was 0. 980 mol Br/mol IL and the amine content was 0. 948 molNH2/mol IL. The product was characterized by ^1HNMR,^13CNMR, IR and MS. Experimental result indicated that the IL is an effective absorbent of CO2. The solubility of CO2 in mass fraction 45% aqueous solution of the IL was up to 0. 444 mol CO2/mol IL at 40℃ and 106 kPa,very close to the theoretical maximum loading（0. 5 mol CO2/mol IL）. The absorption process could be reversed under vacuum at 90℃ , and the absorption efficiency of the IL has little observable loss after repeated use.

关 键 词：离子液体 二氧化碳 吸收 解吸 

分 类 号：X511[环境科学与工程—环境工程]