Deep eutectic solvents (DESs) have emerged as promising “green” solvents, but their successful industrial application requires relatively low viscosity. DESs prepared from choline chloride and glycols offer such a possibility. Viscosity and density are reported for a number of DESs obtained by mixing choline chloride and a glycol (ethylene glycol, 1,2-propanediol, 1,3-propanediol, and 1,4-butanediol). The measurements were performed at 101.3 kPa, at temperatures between 293.15 and 333.15 K, and for different mole ratios of glycol and choline chloride. The viscosity was measured with a capillary viscometer, while the density was measured by means of a vibrating U-tube densimeter. The density and viscosity data have expanded relative uncertainties of 0.2 and 2.0%, respectively, with a coverage factor of 2. The viscosity of pure glycols was modeled using the extended hard-sphere (EHS) model that has its basis in kinetic theory and the molecular description of the fluid. Each DES was treated as a binary mixture, and the EHS model was used, with a mole average mixing rule, to calculate its viscosity. The measured DES viscosity data were represented with an average absolute deviation of 1.4% and a maximum deviation of 7%.

中文翻译：

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基于胆碱氯化物的深共晶溶剂的粘度：实验和建模

深低共熔溶剂（DES）已成为有前途的“绿色”溶剂，但其成功的工业应用需要相对较低的粘度。由氯化胆碱和乙二醇制备的DES提供了这种可能性。报告了通过混合氯化胆碱和乙二醇（乙二醇，1,2-丙二醇，1,3-丙二醇和1,4-丁二醇）获得的许多DES的粘度和密度。测量在101.3 kPa，293.15和333.15 K之间的温度下进行，并且乙二醇和氯化胆碱的摩尔比不同。用毛细管粘度计测量粘度，而用振动U型管密度计测量密度。密度和粘度数据的相对不确定度分别为0.2和2.0％，覆盖因子为2。使用扩展硬球（EHS）模型对纯二醇的粘度进行建模，该模型在动力学理论和流体的分子描述方面具有基础。每个DES被视为二元混合物，并使用EHS模型（具有摩尔平均混合规则）来计算其粘度。测得的DES粘度数据的平均绝对偏差为1.4％，最大偏差为7％。