Selection of Ionic Liquids as Entrainers for the Separation of Ethyl Acetate and Ethanol

详细信息    查看全文

• 作者：Qunsheng Li ; Jiguo Zhang ; Zhigang Lei ; Jiqin Zhu ; Jiujuan Zhu ; Xiaoqiao Huang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2009
• 出版时间：October 7, 2009
• 年：2009
• 卷：48
• 期：19
• 页码：9006-9012
• 全文大小：246K
• 年卷期：v.48,no.19(October 7, 2009)
• ISSN：1520-5045

文摘

This work tries to explore the relation between molecular structures of ionic liquids (ILs) as entrainers and separation performance on ethyl acetate (1) and ethanol (2). The vapor−liquid equilibrium (VLE) data have been measured for ethyl acetate (1) + ethanol (2) containing ILs at 101.32 kPa. The ionic liquids investigated were 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]⁺[BF₄]⁻) and 1-methyl-3-octylimidazolium tetrafluoroborate ([OMIM]⁺[BF₄]⁻), as well as 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]⁺[BF₄]⁻) that has been studied in our previous work. All the ILs could give rise to the salting-out effect. It was found that, at low IL concentration, the separation ability of ILs is in the order [EMIM]⁺[BF₄]⁻ > [BMIM]⁺[BF₄]⁻ > [OMIM]⁺[BF₄]⁻, while at high IL concentration (x₃ = 0.10−0.30) the separation ability of ILs is in the order [OMIM]⁺[BF₄]⁻ > [EMIM]⁺[BF₄]⁻ > [BMIM]⁺[BF₄]⁻ due to the difference of polarity of the three ILs and demixing effect. [EMIM]⁺[triflate]⁻ was included as entrainer and compared with the tetrafluoroborate-based ILs. The measured ternary data were correlated using the NRTL model.