Liquid鈥揕iquid Equilibrium Studies on the Removal of Thiophene and Pyridine from Pentane Using Imidazolium-Based Ionic Liquids

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• 作者：Ramalingam Anantharaj ; Tamal Banerjee
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：April 11, 2013
• 年：2013
• 卷：58
• 期：4
• 页码：829-837
• 全文大小：488K
• 年卷期：v.58,no.4(April 11, 2013)
• ISSN：1520-5134

文摘

1-Ethyl-3-methylimidazolium-based ionic liquid with acetate [OAc], ethylsulfate [EtSO<sub>4sub>], and methyl sulfonate [MeSO<sub>3sub>] anions was used to generate the liquid鈥搇iquid equilibrium (LLE) data for the quaternary mixture of IL (1)鈥搕hiophene (2)鈥損yridine (3)鈥損entane (4). The selectivity and distribution coefficient values were calculated to evaluate the effectiveness of the simultaneous extraction of thiophene and pyridine from pentane at ambient conditions. The experimental tie-line data were successfully validated by the nonrandom two liquid (NRTL) and universal quasi-chemical (UNIQUAC) models, giving root mean square deviation (RMSD) values less than 1 % for all the systems. The novelty of the work was that a conductor like screening model for real solvents (COSMO-RS) model was used to predict compositions of quaternary systems. However, it failed to reproduce the slope of the tie-lines at high solute concentration, especially for the ionic liquid rich phase. The COSMO-RS predictions gave a RMSD of 4.62 % ([EMIM][OAc]), 5.3 % ([EMIM][EtSO<sub>4sub>]), and 6.07 % ([EMIM][MeSO<sub>3sub>]).