离子液体萃取分离丙酮-环己烷机理及工艺模拟
Mechanism and process simulation of acetone-cyclohexane separation using ionic liquid extraction
为实现丙酮-环己烷体系的有效分离,以1-乙基-3-甲基咪唑二氰胺([EMIM][DCA])为萃取剂,在303.15 K和1.013 25 MPa下测量了三元体系的液-液相平衡(LLE)数据,计算得出分配系数(β)与选择性(S)分别为11.04和607.99,表明[EMIM][DCA]能够有效分离丙酮和环己烷。使用Othmer-Tobias方程验证热力学一致性,R2>0.99。基于非随机双液(NRTL)模型对LLE数据进行关联,均方根误差(RMSD)<2%。通过相互作用能、静电势(ESP)以及基于独立梯度模型(IGMH),揭示了[EMIM][DCA]与共沸物间相互作用的大小、位点与作用类型。通过Aspen Plus软件进行萃取模拟及优化。
In order to realize the effective separation of acetone-cyclohexane system,the liquid-liquid equilibrium (LLE) data of the ternary system were measured in this study using 1-ethyl-3-methylimidazolidine dicyandiamide ([EMIM][DCA]) as the extractant,and the distribution coefficient (β) and selectivity (S) were calculated to be 11.04 and 607.99,respectively,which indicated that [EMIM][DCA] can effectively separate acetone and cyclohexane.Thermodynamic agreement was verified using the Othmer-Tobias equation with R2>0.99.The LLE data were correlated based on a non-randomized two-liquid (NRTL) model with root mean square error (RMSD)<2%.The magnitude,site and type of interaction between [EMIM][DCA] and azeotrope were revealed by interaction energy,electrostatic potential (ESP) and independent gradient model based on Hirshfeld partition (IGMH).Extraction simulation and optimization were performed by Aspen Plus software.
离子液体 / 萃取过程模拟 / 量子化学计算 / NRTL / 液-液相平衡
ionic liquids / simulation of extraction processes / quantum chemical calculations / NRTL / liquid-liquid phase equilibrium
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国家自然科学基金项目(22278272)
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