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。 In this paper, calcium chloride - water + acetonitrile, calcium chloride - water + 1,4 - dioxane and potassium acetate - water + acetonitrile, potassium acetate - water +1,4 Vapor Pressure Data of Four Systems of. The vapor-liquid equilibrium data of the system were calculated by correlating the vapor pressure data with Pitzer equation and the Wilson activity coefficient equation. The results show that all the systems, salt, all play a role of salt solution to the water components, salting out of the organic components. In the concentrations studied, calcium chloride and potassium acetate showed similar salt effect on acetonitrile + water system, while in 1,4-dioxane-water system, the salt solution of calcium chloride to water solvent Significantly greater than potassium acetate.