ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Physicochemical and excess properties of binary mixtures of (1-alkyl-3-methylimidazoliumchloride/bromide + ethylene glycol) at T = (288.15 to 333.15) K

Yun-Xia Zhang, Shu-Ni Li, Quan-Guo Zhai, Yu-Cheng Jiang, and Man-Cheng Hu

School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi’an, Shaanxi, 710062, China

E-mail: lishuni@snnu.edu.cn

Abstract: In the present work, the density, ρ, refractive index, n_D, and dynamic viscosity, η, for four binary solutions containing ionic liquids [C_nmim]X (C_nmim = 1-alkyl-3-methylimidazolium; n = 6, 8; X = Cl, Br) and ethylene glycol (EG) were investigated at temperatures of 288.15-333.15 K and at ambient pressure. In addition, the excess molar volume, V^E_m, was calculated and correlated using the Redlich-Kister polynomial equation. The temperature effect on the density of the binary systems studied was expressed by a linear two-parameter equation. The variation in density, refractive index, and viscosity with the composition was described by polynomial equations. The influence of carbon chain-length and the anion of the ionic liquids, and the influence of the temperature on the physicochemical properties of the binary systems can be explained by comparison of the experimental results.

Keywords: density – viscosity – refractive index – imidazolium-based ionic liquid – ethylene glycol

Full paper is available at www.springerlink.com.

DOI: 10.1515/chempap-2015-0211

Chemical Papers 70 (3) 384–394 (2016)