摘要
本文用静态法结合双沸点仪比较法测定了氯化钙—水+乙腈、氯化钙—水+1,4-二氧六囨和醋酸钾—水+乙腈、醋酸钾—水+1,4-二氧六囨四个体系的蒸汽压数据。用 Pitzer 方程关联蒸汽压数据,结合 Wilson 活度系数方程对所测体系的汽液平衡数据进行了计算。结果表明:所有体系,盐对水组分均起盐溶作用,对有机组分起盐析作用。在所研究的浓度范围内,氯化钙和醋酸钾对乙腈+水体系表现出类似的盐效应,而在1,4-二氧六囨+水体系中,氯化钙对水溶剂的盐溶作明显地大于醋酸钾。
The present paper gave a study on vapor-liquid equilibria for the systems as follows:(1)CaCl_2-water-acetonitrile;(2)CaCl_2-water-1,4-dioxane;(3)KAc-water-acetonitrile;(4)KAc-water-1,4-dioxane.The boiling points of these systems were measured and the Pitzer theory of electrolytic solution was used to evaluate the data of vapor pressure for the single solvent,respectively.Combined with Wilson equation the vapor compositions were precdicted from the total pressure,boiling point and the composi-tion of the liquid phase by Barker's method.The results suggest that the salt act salt-in ac-tion on water component and salt-out action on all the organic components.Over the whole component range studied,CaCl_2 and KCI have similar salt effect in the sysytem of water with acetonitrile.But for the system of water with 1,4-dioxane,the ability of the salt-in effect of calcium chloride on the water component is apparently greater than that of potassium acetate.
出处
《河南科学》
1990年第3期43-49,共7页
Henan Science
基金
国家自然科学基金资助课题。
关键词
溶液
盐溶
汽液平衡
盐效应
Vapor-liquid equilibrium
Salt effect
Salt-out
salt-in
