汽液平衡法研究NaI在甲醇-苯中的活度系数  

Study of Activity Coefficients for Sodium Iodide in Methanol-benzene System by Vapor-liquid Equilibrium Measurements

作　　者：杨美芳[1] 冷春莉[1] 李淑彩[1] 孙仁义[1] 

机构地区：[1]河南大学化学化工学院,河南开封475001

出　　处：《河南大学学报（自然科学版）》2006年第4期32-37,共6页Journal of Henan University:Natural Science

摘　　要：测定了甲醇-苯-NaI体系常压汽液平衡数据,采用双标准检验法对数据进行检验,检验结果全部合格.假定NaI的平均活度系数可表示为盐浓度平方根(m1/2)的幂级数,采用全部合格的汽液平衡数据拟合出幂级数中的各项系数,从而获得在双液比固定条件下盐在非水混合体系的活度系数.计算结果表明正常泡点温度下在具有固定双液比的甲醇-苯混合溶剂中NaI的平均活度系数随盐浓度的增加先减小,经过一个极小值后又增加.此法可推广于其它非水混合溶剂中电解质活度系数的测定.By measuring the vapor-liquid equilibrium of methanol- benzene-NaI and verifying the data by means of ternary Gibbs-Duhem equation, the data of the vapor-liquid equilibrium of methanol- benzene-Nal were in agreement with both criterious . It is supposed that the mean activity coefficients of Nai may be represented by power of m^1/2 Then each parameter of power equation was fitted. The results of calculation show that at the equilibrium temperature and pressure the activity coefficients of Nal in methanol- benzene system with fixed composition decrease at first as its concentration increases, then they pass a minimum and increase gradually again. This method is adapted to determination of eleetrolytical activity coefficients in non-aqueous solvents.

关 键 词：非水体系 汽液平衡 碘化钠 活度系数 

分 类 号：O645.16[理学—物理化学]