THERMOPHYSICAL PROPERTIES OF 1-ETHYL-3-METHYLIMIDAZOLIUM CHLORIDE SOLUTION FROM 293.15 TO 323.15 K

ABSTRACT Aqueous systems composed of ionic liquid make up a new alternative for use in processes involving the separation of biomolecules. The objective of this experiment was to obtain the thermo-physical properties of density, refractive index, electrical conductivity, molar volume, thermal expansion coefficient and apparent specific volume of the ionic liquid 1-ethyl-3-methylimidazolium chloride. The thermo-physical properties of aqueous solutions of this ionic liquid were measured as a function of the mass fraction w = (0.05, 0.125, 0.2, 0.275 and 0.35), temperature T = (293.15, 303.15, 313.15 and 323.15) K and pH = (7.5, 8.0 and 8.5). Models representing the combined effects between variables were fit since they are required for industrial applications where the physical parameters must be accurately calculated. Models representing the combined effects of the variables temperature, mass fraction and pH values of ionic liquid were adjusted and presented good fit.

摘要：由离子液体（ionic liquid）构成的水相体系，为生物分子分离相关工艺提供了新型替代方案。本实验以1-乙基-3-甲基咪唑氯盐（1-ethyl-3-methylimidazolium chloride）为研究对象，旨在获取其密度、折射率、电导率、摩尔体积、热膨胀系数及表观比体积等热物理性质。本实验测定了该离子液体水溶液的热物理性质，测定时的变量包括质量分数w=(0.05、0.125、0.2、0.275和0.35)、温度T=(293.15、303.15、313.15和323.15)K以及pH值=(7.5、8.0和8.5)。鉴于工业应用中需精确计算物理参数，因此构建了可描述变量间联合效应的模型。针对温度、质量分数与离子液体pH值的联合效应所拟合的模型展现出良好的适配性。