对苯二甲酸、对甲基苯甲酸和对羧基苯甲醛在醋酸一水体系中溶解度的测定与关联

Measurement and correlation of solubility of terephthalic acid,p-toluic acid and 4-carboxybenzaldehyde in aqueous acetic acid solution

用平衡法测定了318.15～383.15 K对笨二甲酸、对甲基笨甲酸和对羧基苯甲醛在醋酸水溶液(w(醋酸)=94%)中的溶解度。结果表明:实验范围内3种溶质在溶剂中的溶解度均随温度升高而增大;溶解度由大到小的顺序为对甲基苯甲酸、对羧基苯甲醛、对苯二甲酸;用λh方程和经验方程对溶解度数据进行关联,得到了相应的模型参数,模型计算值和实验值相对偏差均小于5%,平均绝对相对偏差均小于3%。

The saturation solubility of terephthalic acid,p-toluic acid and 4-carboxybenzaldehyde in aqueous acetic acid solution（w（ac） =94%） was determined at 323.01～382.51 K by the steady method.It was found that,solubility of all the solutes increased with the increase of temperature,and the solubility of the solutes ranked in the order of p-toluic acid,4-carboxybenzaldehyde and terephthalic acid.Then,Ah equation and empirical equation were used for correlation and calculation of the solubility data.The calculated data were in agreement with of experimental data for relative error less than 5%and average absolute relative error less than 3%.