石油化工2025，Vol.54Issue(9)：1263-1271,9.DOI:10.3969/j.issn.1000-8144.2025.09.006
醋酸类离子液体分离乙酸正丁酯-正丁醇:COSMO-RS预测、汽液平衡实验及机理探讨
Separation of n-butyl acetate and n-butanol by acetic acid ionic liquids:COSMO-RS prediction,vapor-liquid equilibrium experiment and mechanism exploration
摘要
Abstract
In the process of preparing n-butyl acetate(BAC),an azeotropic mixture of BAC and n-butanol(BUOH)will be formed inevitably,which is difficult to separate both by conventional distillation.By employing selectivity as the main indicator and considering the physiochemical properties of ionic liquids(ILs),triethyl-butyl-phosphonium acetate([P2444][AC])and tetrabutyl phosphonium acetate([P4444][AC])were selected as extractants for the separation of BAC and BUOH via the adoption of COSMOthermX 19.0 software.The vapor-liquid equilibrium(VLE)data of the binary system(BAC-BUOH)and the ternary system(BAC-BUOH-ILs)were measured at 101.3 kPa,with the NRTL model employed to correlate with the VLE data.The simulation results indicate that the two ILs can increase the relative volatility of BAC to BUOH,and the separation effect is more obvious with the increasing ILs content.The separation performance is[P2444][AC]>[P4444][AC].The excess enthalpy analysis shows that the two ILs have stronger interaction with BUOH,and hydrogen bonding dominates,thus improving the relative volatility of BAC to BUOH.关键词
乙酸正丁酯/正丁醇/离子液体/汽液平衡Key words
n-butyl acetate/n-butanol/ionic liquids/vapor-liquid equilibrium分类
化学化工引用本文复制引用
王超,张亲亲,辛华,刘嘉欣,王文俊,张志刚..醋酸类离子液体分离乙酸正丁酯-正丁醇:COSMO-RS预测、汽液平衡实验及机理探讨[J].石油化工,2025,54(9):1263-1271,9.基金项目
国家自然科学基金项目(21978173,22108174) （21978173,22108174）
沈阳化工大学优秀青年基金项目(2019YQ002). （2019YQ002）
