π Electron induced separation of organic compounds using supported ionic liquid membranes
π Electron induced separation of organic compounds using supported ionic liquid membranes
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DOI：
10.1016/j.seppur.2019.116237
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发表时间：
2020-04-01
影响因子：
8.6
通讯作者：
Wickramasinghe, Ranil
中科院分区：
文献类型：
--
作者：
Kamaz, Mohanad;Vogler, Ronald J.;Wickramasinghe, Ranil
已经测试了支撑离子液体膜用于有机化合物的分馏。咪唑类离子液体; 1-烯丙基-3-乙烯基咪唑溴化物、1-己基-3-乙烯基咪唑溴化物和1-辛基-3-乙烯基咪唑溴化物被捕获在聚丙烯膜的孔中。本文研究了苯、萘、菲在十四烷中的分馏以及二苯乙烯在己烷中的分馏。接收相是己烷。芳香族溶质的π电子云密度的差异影响它们与咪唑阳离子的相互作用，这可以影响传输速率。在三种芳香族溶质的情况下，共轭度和分子量按苯、萘和菲的顺序增加。这些相反的效果导致测试的三种离子液体的三种溶质的相似的传质系数。然而，对于顺式和反式二苯乙烯，传质系数较大的所有三种离子液体。反式异构体的芳族堆积增强可能导致更高的传质系数。此外，1-己基-3-乙烯基咪唑双（三氟甲基磺酰基）酰亚胺被用作液膜相，在水中分离两个核碱基：胸腺嘧啶和胞嘧啶。接收相也是水。胸腺嘧啶的膜传质系数是胞嘧啶的5.5倍，表明利用与咪唑基团的多峰相互作用来分离化合物的可能性。
Supported ionic liquid membranes have been tested for fractionation of organic compounds. Imidazolium based ionic liquids; 1-ally1-3-vinylimidazolium bromide, 1-hexy1-3-vinylimidazolium bromide and 1-octy1-3-vinylimidazolium bromide were trapped in the pores of a polypropylene membrane. Fractionation of a feed stream consisting of benzene, naphthalene and phenanthrene in tetradecane and cis- and trans-stilbene in hexane were investigated. The receiving phase was hexane. Differences in the pi electron cloud density of the aromatic solutes influence their interactions with the imidazolium cation, which can affect the rates of transport. In the case of the three aromatic solutes, the degree of conjugation and molecular weight increase in order benzene, naphthalene and phenanthrene. These opposing effects result in similar mass transfer coefficients for the three solutes for the three ionic liquids tested. However, for cis-and trans-stilbene, the mass transfer coefficient was larger for all three ionic liquids. It is likely that enhanced aromatic stacking of the trans- isomer led to a higher mass transfer coefficient. In addition, 1-hexy1-3-vinylimidazolium bis(trifluoromethylsulfonyl)imide was used as the liquid membrane phase to fractionate two nucleobases: thymine and cytosine in water. The receiving phase was also water. The membrane mass transfer coefficient for thymine was 5.5 times greater than cytosine indicating the possibility of exploiting multimodal interactions with the imidazolium group to fractionate compounds.