胆碱氨基酸离子液体水溶液在288.15~323.15 K的传输性质  

Transport Properties of Aqueous Solution of Choline-Amino Acid Based Ionic Liquid at 288.15—323.15 K

作　　者：周宁宁 殷天翔[1] ZHOU Ningning;YIN Tianxiang(School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化学与分子工程学院,上海200237

出　　处：《华东理工大学学报（自然科学版）》2022年第1期8-18,共11页Journal of East China University of Science and Technology

基　　金：国家自然科学基金(21773063,21373085)。

摘　　要：合成了两种基于胆碱和氨基酸的离子液体(Cholinium-Amino Acid Based Ionic Liquids,CHAAILs),即胆碱甘氨酸离子液体([Ch][Gly])和胆碱丙氨酸离子液体([Ch][Ala])。测定了[Ch][Gly]+H_(2)O和[Ch][Ala]+H_(2)O体系在288.15~323.15 K、每间隔5 K下的黏度和电导率。黏度和电导率随温度的变化分别用Arrhenius方程和Vogel-Fulcher-Tamman(VFT)方程进行描述。CHAAILs+H_(2)O混合物的黏度随温度的升高而降低,电导率随温度的升高而升高。用Redlich-Kister方程计算并关联超额黏度(Δη),结果显示Δη有明显的负偏差,且Δη随温度的降低和氨基酸阴离子烷基链长的增加而增加。CHAAILs+H_(2)O混合物的摩尔电导率和黏度之间的关系用Walden规则进行了关联,结果显示[Ch][Ala]+H_(2)O的二元体系具有较好的离子化程度。Choline-amino acid based ionic liquids(CHAAILs)are well-established eco-friendly chemicals.However,the high viscosity of pure ionic liquids limits their industrial applications.Instead,ionic liquid-containing solutions are more frequently used.For example,the mixture of CHAAILs and water has already been used in biomass processing and extraction.However,there are only few studies on the physicochemical properties of aqueous solutions of CHAAILs,especially on migration properties such as viscosities(η)and electrical conductivities(к),which are important physical and chemical parameters for the industrialization of ionic liquids,and also for their mass transfer rate.Herein,we synthesized two CHAAILs,cholinium glycinate([Ch][Gly])and cholinium analinate([Ch][Ala]).The viscosities and the electrical conductivities of[Ch][Gly]+H_(2)O and[Ch][Ala]+H_(2)O systems were determined at 288.15-323.15 K.The changes in viscosity and electrical conductivity of these systems with temperature were described by the Arrhenius equation and VFT equation,respectively.The viscosity and conductivity of the CHAAILs+H_(2)O mixtures decreased and increased with temperature,respectively.The excess viscosity(Δη)of the systems was calculated and correlated by the Redlich-Kister equation,resulting in a negative deviation,which increased with decreasing temperature as well as the increase in alkyl chain length of amino acid anion.The relationship between molar electrical conductivities and viscosities of CHAAILs+H_(2)O mixtures was correlated by the Walden rule.The results suggest that the binary system of[Ch][Ala]+H_(2)O has good ionicity.

关 键 词：离子液体 黏度 电导率 超额黏度 Walden规则 

分 类 号：O64[理学—物理化学]