Activity coefficients at infinite dilution of organic solvents and water in 1-butyl-3-methylimidazolium dicyanamide. A literature review of hexane/hex-1-ene separation

作者：Domanska Urszula^*; Wlazlo Michal; Karpinska Monika

来源：Fluid Phase Equilibria, 2016, 417: 50-61.

DOI：10.1016/j.fluid.2016.02.004

• Experimental activity coefficients at infinite dilution
• Ionic liquid [BMIM][DCA]
• Literature review hexane/hex-1-ene
• Thermodynamics
• Separation

The work presented focused on the experimental data of the activity coefficients at infinite dilution, (gamma(infinity)(13)) of several solutes in ionic liquid of 1-butyl-3-methylimidazolium dicyanamide, [BMIM][DCA]. The values of gamma(infinity)(13) for 64 solutes, including alkanes, cycloalkanes, alkenes, alkynes, aromatic hydrocarbons, alcohols, water, ethers, ketones, acetonitrile, pyridine, 1-nitropropane, thiophene, and esters in [BMIM][DCA] were determined by gas-liquid chromatography at six temperatures in range of (318.15-368.15) K. The gas-liquid partition coefficients were calculated for all solutes. The partial molar excess Gibbs energy, enthalpy and entropy at infinite dilution were calculated from the experimental gamma(infinity)(13) values. The [BMIM] [DCA] was discussed as a solvent for the different types of separation problems with special attention to the separation of hexane/hex-1-ene, cyclohexane/cyclohexene and ethylbenzene/styrene. This work discuss a particular type of mixture made up of small hydrocarbons (alkanes) and their unsaturated counterparts (alkenes). The separating ability of the investigated ionic liquid was compared with the previously investigated 1-butyl-3-methylimidazolium-based, and dicyanoamide-based ILs for three chosen separation problems. Additionally, a literature review of gamma(infinity)(13) for the hexane/hex-1-ene separation problem at T = 323.15 K is presented for the years 2010-2015. It was found that several ILs may replace conventional solvents. The proposed [BMIM][DCA] may be used as an alternative solvent for the separation of alkenes from alkanes.

• 出版日期2016-6-15