羧酸功能化离子液体吸收分离丙炔/丙二烯/丙烯  

Separation of propyne, propadiene and propylene with carboxylate ionic liquids

作　　者：柯天 张诗诗 鲍宗必[1,2] 张治国 杨亦文[1,2] 杨启炜 任其龙[1,2] Tian Ke;Shishi Zhang;Zongbi Bao;Zhiguo Zhang;Yiwen Yang;Qiwei Yang;Qilong Ren(Key Laboratory of Biomass Chemical Engineering of Ministry of Education,Department of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China;Institute of Zhejiang University-Quzhou,Quzhou 324000,China)

机构地区：[1]浙江大学化学工程与生物工程学院,生物质化工教育部重点实验室,杭州310027 [2]浙江大学衢州研究院,衢州324000

出　　处：《中国科学：化学》2021年第10期1450-1456,共7页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:21890764)资助项目。

摘　　要：丙炔/丙二烯/丙烯等C_(3)气体的分离是丙烯纯化过程中的关键环节.以离子液体为分离介质的吸收分离技术能够克服传统有机溶剂的缺点,有望应用于C_(3)气体的分离.本工作测定了C_(3)气体在强氢键碱性羧酸功能化离子液体中的溶解度,结果表明这类离子液体兼具高的丙炔、丙二烯吸收容量和丙炔/丙烯、丙二烯/丙烯选择性,其中[P_(4442)][C_(5)COO]在313.1 K下对丙炔摩尔吸收容量达到0.3 mol/mol,是目前已报道的最高值,同时丙二烯容量也达到0.14 mol/mol,明显高于丙烯吸收容量.不同长度阴离子和不同温度下的溶解度表明,阴离子碳链较短和温度较低时这类离子液体具有更好的丙炔/丙二烯/丙烯分离性能.吸收-解吸循环实验证明所使用的离子液体具备良好的循环再生性能.Separation of C_(3) gases including propyne, propadiene and propylene is important for propylene purification.The absorption separation technology using ionic liquid as the separation medium can overcome the shortcomings of traditional organic solvents and is expected to be promising for the separation of C_(3) gases. The solubilities of C_(3) gases in strongly hydrogen-bonding basic carboxylate ionic liquids(ILs) have been measured in this work, and the results showed that these ILs had both high capacity and high selectivity in the separation of C_(3) gases. In particular,[P_(4442)][C_(5 )COO] had a molar solubility of 0.3 mol/mol for propyne at 313.1 K, which reached the highest value.Meanwhile, the solubility of propadiene reached 0.14 mol/mol, significantly higher than that of propylene. The solubility of C_(3) gases in ILs with different anion lengths and different temperatures showed that the better C_(3) gas separation performance was achieved with a shorter anion and a lower temperature. Absorption-desorption recycling tests proved that these ILs had great recycling performance.

关 键 词：离子液体 气体吸收 丙烯 

分 类 号：O645.1[理学—物理化学] TQ221.212[理学—化学]