Isobaric Vapor–Liquid Equilibrium for Isopropanol + Water + 1-Ethyl-3-methylimidazolium Tetrafluoroborate

• Published in: Journal of chemical and engineering data Vol. 53; no. 1; pp. 275 - 279
• Main Authors: Li, Qunsheng, Xing, Fengying, Lei, Zhigang, Wang, Baohua, Chang, Qiulian
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 10.01.2008
• Subjects: Chemistry; Exact sciences and technology; General and physical chemistry; Liquid-vapor equilibria; Phase equilibria; Water; Ternary system; Isobar; Liquid vapor equilibrium; Secondary alcohol; Phase equilibrium; Ionic liquid
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je7003808

Isobaric vapor–liquid equilibrium (VLE) data for the isopropanol (1) + water (2) system containing ionic liquid (IL) 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]+[BF4]−) at atmospheric pressure (101.32 kPa) were measured with a modified Othmer still. The results showed that the VLE of isopropanol + water in the presence of different contents of IL was obviously different from that of the IL-free system. The IL studied showed a salting-out effect, which gave rise to a change of the relative volatility of isopropanol and even to the elimination of the azeotropic point. It was found that the salting-out effect followed the order of x 3′ = 0.30 > x 3′ = 0.20 > x 3′ = 0.10, which was probably attributed to the interaction between the ions resulting from the dissociation of IL and water.