LiCl-乙醇-水三元体系活度系数研究  

Study on Activity Coefficient of LiCl-ethanol-water Ternary Solution

作　　者：吴曦[1] 杨帅帅 徐士鸣[1] 任钰杰 王卓发 张鑫杰 WU Xi;YANG Shuaishuai;XU Shiming;REN Yujie;WANG Zhuofa;ZHANG Xinjie(School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《制冷技术》2022年第5期7-12,共6页Chinese Journal of Refrigeration Technology

基　　金：国家自然科学基金(No.52076026,No.51606024);中央高校基本科研业务费资助(No.DUT22JC25)。

摘　　要：本文采用电动势法测定了25℃时LiCl在乙醇-水混合溶剂中的电动势值,并用Pitzer方程关联不同溶剂组成时的实验结果,得到LiCl-乙醇-水三元体系活度系数,进而计算出溶液渗透系数与过量吉布斯自由能。结果表明,溶剂组分一定时,随LiCl浓度增大,体系活度系数呈现先下降后上升的趋势;而当LiCl浓度一定时,体系活度系数随溶剂中水含量的增加而增大,实测极大值提高约1倍。溶液渗透系数随溶质、溶剂的变化规律与活度系数的变化规律相似。过量吉布斯自由能在固定溶剂组成时随LiCl浓度的增大呈现逐渐减小的趋势;而在同一浓度下,随着乙醇质量分数的增大,过量吉布斯自由能减小。The electromotive force of LiCl in aqueous ethanol solution is measured at 25℃by electromotive force method,and the experimental data are correlated by Pitzer equation.Accordingly,the activity coefficient of LiClethanol-water ternary solution is obtained.Further,the permeability coefficient and excess Gibbs free energy are calculated.The results show the activity coefficient is first decreased but then increases with the increase of LiCl concentration at the same solvent composition condition,and which is increased with the increase of water component in blending solvent at the same solution concentration condition,with the maximum value doubly improved.The variation tendency of the permeability coefficient is similar to the activity coefficient as above.The excess Gibbs free energy is decreased with the increase of LiCl concentration,but decreased with the increase of ethanol component,at conditions of the same solvent composition and solution concentration respectively.

关 键 词：工作溶液 活度系数 逆电渗析 能量转换 乙醇 

分 类 号：TB611[一般工业技术—制冷工程] TK124[动力工程及工程热物理—工程热物理]