南京大学学报（自然科学版）2017，Vol.53Issue(6)：1171-1177,7.DOI:10.13232/j.cnki.jnju.2017.06.019
咪唑类离子液体对低压丙酮蒸气吸收性能研究
Study on absorption of low pressure acetone vapor in imidazole ionic liquids
摘要
Abstract
Low vapor liquid equilibrium(VLE)of acetone binary mixtures with five imidazole ionic liquids(ILs)was re-spectively investigated by using ternary-vessel equilibrium system.VLE measurements were carried out over an extremely low concentration range and at the temperature ranging from 303.2 to 333.2 K.On basis of the solubility data,the infinite dilution activity(γ∞)and Henry's constant(H)were derived and described by using the nonrandom two-liquid model(NRTL).Moreover,the thermodynamic properties of absorption process such as Gibbs energy, partial molar enthalpies and entropies,partial molar excess enthalpies at infinite dilution(HE,∞i ),were correlated. The obtain results indicate that Henry's constant increases with a rise in temperature,implying that absorption of acetone is a typical physical absorption.Owing to the γ∞all being less than 1,the mixtures show negative deviation solution,which benefits of absorption.Lengthening the length of substituted alkyl slightly enhances the solubility. Relative to cation species,the anion plays a great role in determining the solubility,which increases as order[BF4]<[PF6]<[Tf2N].From thermodynamic analysis,it is found the process of acetone vapor absorption is regulated by entropy.The absorption entropy change of acetone in[Tf2N]species is greater of the three,resulting in better ther-modynamical stability and great intermolecular force between acetone and ILs.关键词
低压吸收/气液平衡/挥发性有机化合物/离子液体/热力学分析Key words
low vapor pressure aborption/vapor liquid equilibrium/volatile organic compounds/ionic liquids/thermo-dynamical analysis分类
资源环境引用本文复制引用
赵卫伟,巫先坤,李长浩,陆琛,张锋..咪唑类离子液体对低压丙酮蒸气吸收性能研究[J].南京大学学报（自然科学版）,2017,53(6):1171-1177,7.基金项目
国家自然科学基金(91634104,21476105),江苏省产学研项目-前瞻性联合研究项目(BY2016068-03) （91634104,21476105）
