离子液体[emim][Tf<sub>2</sub>N]的表面张力、密度、黏度及电导率实验测定

摘要

在298.15~338.15 K 0.1 MPa工况下测定了离子液体1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐（[emim][Tf₂N]）的表面张力、密度、黏度及电导率；采用最小二乘法拟合了实验数据，得到了表面张力和密度随温度的回归方程；在相同工况下，同其他实验数据以及采用基团贡献法得到的数据进行了对比；同时，研究了相关物性参数同离子液体结构和温度的关系。研究结果表明：离子液体的表面张力随阳离子取代基碳链长度的增大而减小，随阴离子尺寸的增加而减小；其表面张力和密度随温度的升高均呈线性减小变化；黏度随着温度的升高逐渐降低；电导率随着温度的升高而增大。以上物性的测定和研究，填补了离子液体[emim][Tf₂N]相关物性参数的空白，同时也为该种离子液体的应用，尤其是在吸收式制冷系统中的应用，提供了参考。

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	何丽娟
	黄艳伟
	袁致林
	李虹琰
	李松波

关键词：表面张力；测量；合成； Wilhelmy白金板法；密度；离子液体

Abstract：

Surface tensions, densities, viscosities and conductivities of ionic liquid 1-ethyl-3-methylimidazolium bis[ (trifluoromethyl)sulfonyl]imide ([emim] [Tf₂N]) are experimentally measured in the temperature range of 298.15 K~338.15 K at 0.1 MPa. Experimental data of surface tensions and densities are correlated with temperature by using the least square method and the corresponding regression equations are obtained. The experimental data are also compared with works in literatures along with the ones calculated in group contribution method. Additionally, relationships of these properties with molecular structures and temperature are also studied:With an increase of the length of the cation substituted carbon chain or the anion size, surface tensions of ionic liquid decrease. By increase the temperature, surface tensions and densities show almost linearly decrease trends. Viscosities decrease while conductivities increase with an increase of temperature. The determination of these properties of[emim] [Tf₂N] provides a possibility of applying it in absorption refrigeration systems.

Keywords： surface tension； measurement； synthesis； Wilhelmy plate method； density； ionic liquid

Received 2016-12-21;

Fund:

国家自然科学基金资助项目（51566014，51106068）；内蒙古自然科学基金资助项目（2015MS0547）。

Corresponding Authors: 李松波,E-mail:lisongbo@imust.cn Email: lisongbo@imust.cn

About author: 何丽娟(1973-),女,博士后,教授,研究方向为制冷工质相平衡。

引用本文:

何丽娟, 黄艳伟, 袁致林, 李虹琰, 李松波.离子液体[emim][Tf₂N]的表面张力、密度、黏度及电导率实验测定[J]. 化学工业与工程, 2018,35(4): 17-23

He Lijuan, Huang Yanwei, Yuan Zhilin, Li Hongyan, Li Songbo.Experimental Determination on the Surface Tension, Density, Viscosity and Conductivity of Ionic Liquid 1-Ethyl-3-Methylimidazolium Bis [(trifluoromethyl)sulfonyl]imide[J]. Chemcial Industry and Engineering, 2018,35(4): 17-23

[1] 王建英,赵风云,刘玉敏,等. 1-烷基-3-甲基咪唑系列室温离子液体表面张力的研究[J]. 化学学报,2007, 65(15):1443-1448 Wang Jianying, Zhao Fengyun, Liu Yumin, et al. Study on surface tension of a series of 1-alkyl-3-methylimidazolium room temperature ionic liquids[J]. Acta Chimica Sinica, 2007, 65(15):1443-1448(in Chinese)
[2] 纪俊荣. 离子液体表面/界面性能的研究[D]. 石家庄:河北科技大学, 2010 Ji Junrong. Study on surface and interfacial tension of ionic liquid[D]. Shijiazhuang:Hebei University of Science and Technology, 2010(in Chinese)
[3] 王双平,张晓燕,潘奇伟, 等. 咪唑盐离子液体的微波合成、表征及性质研究[J]. 化学试剂,2009, 31(12):1015-1017 Wang Shuangping, Zhang Xiaoyan, Pan Qiwei, et al. The microwave-assisted synthesis, characterization and study on behavior of chlorinated imidazolium ionic liquids[J]. Chemical Reagents,2009, 31(12):1015-1017(in Chinese)
[4] 谷明信,秦涵书,孟祥丹, 等. 系列离子液体的表面张力研究[J]. 材料导报,2014,28(24):244-250 Gu Mingxin, Qin Hanshu, Meng Xiangdan, et al. Study on the refractive index of series of ionic liquids[J]. Materials Review, 2014, 28(24):244-250(in Chinese)
[5] Almeida H F D, Carvalho P J, Kurnia K A, et al. Surface tensions of ionic liquids:Non-regular trend along the number of cyano group[J]. Fluid Phase Equilibria, 2016, 409:458-465
[6] Geppert-Rybczyńska M, Lehmann J K, Safarov J, et al. Thermodynamic surface properties of[BMIM] [NTf₂] or[EMIM] [NTf₂] binary mixtures with tetrahydrofuran, acetonitrile or dimethylsulfoxide[J]. J Chem Thermodynamics, 2013, 62:104-110
[7] Rilo E, Domínguez-Pérez M, Vila J, et al. Surface tension of four binary systems containing (1-ethyl-3-methyl imidazolium alkyl sulphate ionic liquid+water or+ethanol)[J]. Thermodynamics, 2012, 49:165-171
[8] Jiang H, Zhao Y, Wang J, et al. Density and surface tension of pure ionic liquid 1-butyl-3-methylimidazolium l-Lactate and its binary mixture with alcohol and water[J]. Thermodynamics, 2013, 64:1-13
[9] 李吉广,胡玉峰,褚洪达, 等. 离子液体[C₆mim] [PF₆]和[C₈mim] [PF₆]的热力学性质研究[J]. 黑龙江大学自然科学学报,2009, 26(5):674-679 Li Jiguang, Hu Yufeng, Chu Hongda, et al. Study on the thermodynamic properties of ionic liquids[C₆mim] [PF₆] and[C₈mim] [PF₆] [J]. Journal of Natural Science of Heilongjiang University, 2009, 26(5):674-679(in Chinese)
[10] Rilo E, Pico J, García-Garabal S, et al. Density and surface tension in binary mixtures of CnMIM-BF₄ ionic liquids with water and ethanol[J]. Fluid Phase Equilibria, 2009, 285:83-89
[11] Sattari M, Kamari A, Hashemi H, et al. A group contribution model for prediction of the viscosity with temperature dependency for fluorine-containing ionic liquids[J]. Journal of Fluorine Chemistry, 2016, 186:19-27
[12] Cheng N, Ma X, Sheng X, et al. Aggregation behavior of anionic surface action liquids with double hydrocarbon chains in aqueous solution:Experimental and theoretical investigations[J]. Colloids and Surface A:Physicochem Eng Aspects, 2014, 453:53-61
[13] 杨许召,王军,李刚森, 等. 室温离子液体1-烷基-3-甲基咪唑硫酸甲酯的合成及电导率研究[J]. 精细与专用化学品,2007, 15(10):16-18 Yang Xuzhao, Wang Jun, Li Gangsen, et al. Study on preparation of room temperature ionic liquids 1-alkyl-3-methylimidazole, ethyl sulfate and its electrical conductivity investigation[J]. Fine and Specialty Chemicals, 2007, 15(10):16-18
[14] 胡玉才,殷平,魏建德, 等. 室温离子液体1-丁基-3-甲基咪唑磷酸二丁酯的电导率研究[J]. 广州化工,2006, 34(5):26-29 Hu Yucai, Yin Ping, Wei Jiande. Study of electrical conductivity of room temperature ionic liquid 1-butyl-3-methylimidazolium dibutyl phosphate[J]. Guangzhou Chemical Industry, 2006, 34(5):26-29(in Chinese)
[15] 吴松海,孙永利,贾绍义. 磁场对蒸馏水蒸发过程的影响[J]. 石油化工高等学校学报,2006, 19(1):10-12 Wu Songhai, Sun Yongli, Jia Shaoyi. Effects of magnetic field on evaporation of distilled water[J]. Journal of Petrochemical Universities, 2006, 19(1):10-12(in Chinese)
[16] Freire M G, Carvalho P J, Fernandes A M., et al. Surface tensions of imidazolium based ionic liquids:Anion, cation, temperature and water effect[J]. Colloid and Interface Science, 2007, 314:621-630
[17] Ghatee M H, Bahrami M, Khanjari N. Measurement and study of density, surface tension, and viscosity of quaternary ammonium-based ionic liquids ([N_222(n)]Tf₂N)[J]. J Chem Thermodynamics, 2013, 65:42-52
[18] Sou?ková M, Klomfar J, Pátek J. Surface tension of 1-alkyl-3-methylimidazolium based ionic liquids with trifluoromethanesulfonate and tetrafluoroborate anion[J]. Fluid Phase Equilibria, 2011, 303:184-190
[19] Domańska U, Królikowska M, Walczak K. Effect of temperature and composition on the density, viscosity surface tension and excess quantities of binary mixtures of 1-ethyl-3-methylimidazolium tricyanomethanide with thiophene[J]. Colloids and Surfaces A:Physicochem Eng Aspects, 2013, 436:504-511
[20] Sou?ková M, Klomfar J, Pátek J. Temperature dependence of the surface tension and 0.1 MPa density for 1-C_n-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate with n=2, 4, and 6[J]. J Chem Thermodynamics, 2012, 48:267-275
[21] Sne?ana P, Bešter-Roga? M, Vraneš M, et al. The effect of the alkyl chain length on physicochemical features of (ionic liquids+γ-butyrolactone) binary mixtures[J]. J Chem Thermodynamics, 2016, 99:1-10
[22] Vila J, Ginés P, Pico J M, et al. Temperature dependence of the electrical conductivity in EMIM-based ionic liquids Evidence of Vogel-Tamman-Fulcher behavior[J]. Fluid Phase Equilibria, 2006, 242:141-146