甲酸-乙酸-水-醋酸钠体系汽液平衡的盐效应

采用Otsuki-Williams式汽液平衡釜测定了甲酸-乙酸-水-醋酸钠体系在9.866×10⁴Pa下汽液平衡数据。醋酸钠的加入量为2mol/(kg溶剂)。结果表明:醋酸钠对体系起物理化学作用,也起化学作用。它涉及到了两种盐对各组分的盐溶、盐析和盐效应的不规则现象。根据实验数据,绘制了汽液平衡相图、各组分挥发度等于1的曲线和甲酸-乙酸在体系中相对挥发度等于1的曲线,用以判别、分析盐效应的作用。

Salt Effect of Vapor-Liquid Phase Equilibrium in the System Formic Acid-Acetic Acid-Water-Sodium Acetate

Vapor-liquid equilibrium data (VLE) were measured by Otsuki-Wil-liams still for the formic acid-acetic acid-water-sodium acetate at 9.866×10⁴Pa.2 mol/(kgsolv) of NaAc was used. The results show that the favorable effect ofNaAc is not only chemical action but also physicochemical action. It related totwo salts to the phenomena of salting-out, salting-in and anomalous behavior incomponents. Acording to VLBdata, we have drawn up the VLBcurve, the curveof the volatilities equal to 1 and the curve of the ralative volatilities equal tofor distinguishing and analysing the influence of salt effect.