To separate the azeotrope of ethanol and ethyl methyl carbonate (EMC) using ionic liquids (ILs), the σ-profiles of imidazolium-based ILs with different anions [BF₄]⁻, [HSO₄]⁻, [PF₆]⁻ and [ClO₄]⁻ were calculated by the COSMO-SAC model. Based on the analysis results, 1-ethyl-3-methylimidazolium hydrosulfate ([Emim][HSO₄]), 1-propyl-3-methylimidazolium hydrosulfate ([Prmim][HSO₄]), 1-butyl-3-methyl-imidazolium hydrosulfate ([Bmim][HSO₄]) were selected as extractants to separate ethanol and EMC. The liquid-liquid tie-line data for the ternary systems ethanol + EMC + ILs were measured at 298.15 K under 101.3 kPa, and the influence of ILs with the different alkyl chain length of the cations on the phase behavior was explored. The distribution coefficient and selectivity were calculated to evaluate the extraction capacity of the studied ILs. Meanwhile, the NRTL model was adopted to correlate the experimental results, and the interaction parameters of the NRTL model were also optimized.

为了分离乙醇的共沸物和碳酸甲乙酯（EMC）使用离子液体（离子液体）中，用不同的阴离子咪唑鎓基的离子液体的σ-型材[BF ₄ ] ^-，[HSO ₄ ] ^-，[PF ₆ ] ^-和通过COSMO-SAC模型计算[ClO ₄ ] ^-。根据分析结果，可以使用1-乙基-3-甲基咪唑氢硫酸盐（[Emim] [HSO ₄ ]），1-丙基-3-甲基咪唑氢硫酸盐（[Prmim] [HSO ₄ ]），1-丁基-3-甲基-咪唑硫酸氢盐（[Bmim] [HSO ₄选择]）作为萃取剂，以分离乙醇和EMC。在298.15 K和101.3 kPa下测量了三元系统乙醇+ EMC + IL的液-液结合线数据，并探讨了不同阳离子阳离子烷基链长的IL对相行为的影响。计算分布系数和选择性以评估所研究IL的提取能力。同时，采用NRTL模型对实验结果进行关联，并优化了NRTL模型的相互作用参数。