从混合溶剂中电解质活度系数推算汽液平衡  

PREDICTION OF VAPOR LIQUID EQUILIBRIA FROM ACTIVITY COEFFICIENTS FOR ELECTROLYTE IN MIXED SOLVENT

作　　者：陆小华[1] 张吕正[1] 王延儒[1] 时钧[1] 

机构地区：[1]南京化工学院化学工程系

出　　处：《南京化工学院学报》1992年第2期1-7,共7页

基　　金：国家自然科学青年基金

摘　　要：建立了由混合溶剂中电解质活度系数推算汽液平衡的数值计算方法。在电解质活度系数测定的盐浓度范围内,NaBr(1)-H_2O(2)-MeOH(3)和HCI(1)-H_2O(2)-MeOH(3)两体系在101.3kPa下的汽液平衡计算结果与文献值平均绝对偏差分别为:汽相摩尔分率|Dy_3|=0.025,平衡温度DT=0.40K和Dy_3=0.020,DT=0.76K,对前一体系还能正确地推测出交叉的盐效应规律。A numerical integration method predicting vapor-liquid equilibria from activity coefficients for electrolytes in mixed solvents is proposed. The vapor-liquid equilibria of two systems NaBr(1)H_2O(2)-MeOH (3) and HC1 (1)-H_2O (2)-MeOH (3) were calculated respectively from activity coefficients for electrolytes NaBr and HCl in methanol- water mixtures at 101. 3kPa. In the concentration measuring acitivty coefficients for electrolyte in mixed solvent, the average absolute deviations of prediction value from those available in literature are 0. 025 (the vapor molar fraction)、 0.40K (equilibrium temperature) and 0. 020、0. 76K, respectively. In addition, the cross-salt effect of the system NaBr(1)-H_2O(2)-MeOH(3) could be predicted by our method.

关 键 词：溶剂 汽液平衡 电解质 活度系数 

分 类 号：O642.42[理学—物理化学]