Measurement and correlation of the vapor-liquid equilibrium of cyclohexane + ethanol containing ILs and the thermophysical properties of these ILs at 101.3 kPa. (November 2020)

• Record Type: Journal Article
• Authors: Li, Wenxiu; Zhang, Yu; Li, Honghui; Lu, Ruizhe; Guo, Hongfan; Li, Jipeng; Chen, Jinling; Zhang, Tao
• Is Part Of: Journal of chemical thermodynamics. Volume 150(2020)
• Publication Date: 2020-11
• Subjects: Vapor-liquid phase equilibrium -- Thermophysical property -- Thermodynamic model -- Ionic liquid -- Cyclohexane -- Ethanol; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2020.106203
• Languages: English
• ISSNs: 0021-9614

Abstract

Highlights: Isobaric VLE data of ternary for cyclohexane-ethanol containing IL ([N1, 8, 8, 8 ][Ac], [DMIM][AC] or [C16MIM]) were determined at 101.3kPa. Temperature dependence of some thermophysical properties (heat capacity, viscosity and density) of the three ILs were determined at 101.3kPa and 333.15-363.15 K. The measured data were well correlated. Abstract: Some important topics and issues related to possible extractive distillation separation of cyclohexane + ethanol system using ionic liquids (ILs) are presented in this manuscript. Three ILs with acetate anion (methyl-trioctyl-ammonium acetate [N1, 8, 8, 8 ][Ac], 1-decyl-3-methyl-imidazolium acetate [DMIM][Ac] and 1-hexadecyl-3-methyl-imidazolium acetate [C16 MIM][Ac]) were selected as entrainers. The vapor–liquid phase equilibrium (VLE) data for cyclohexane + ethanol + ILs system were determined at 101.3 kPa and correlated by Wilson and NRTL models. The separation effect of these ILs on the basis of the NRTL model follows this order: [N1, 8, 8, 8 ][Ac] > [DMIM][Ac] > [C16 MIM][Ac]. The binary VLE data of the cyclohexane-ethanol mixture obtained by this device were compared with previously published data and tested by the Herington thermodynamic consistency test. Temperature dependence of some thermophysical properties (density, viscosity and heat capacity) of these ILs were obtained and correlated within the range of possible distillation operating temperatures.