Abstract: Experimental solubilities of terephthalic acid and 1,4-carboxybenzaldehyde in mixed solvent of acetic acid and water were measured at the temperature range from 420K to 505K. It is shown that solubility of terephthalic acid is the most sensitive to temperature under the condition of 70% of acetic acid concentration, and reduces with increased concentration of acetic acid. When temperature is below 470K , solubility of terephthalic acid in water is lower than that of terephthalic acid in acetic acid. However, it is above 470K that the solubility significantly increased the sensitivity to temperature. The solubility of 1,4-carboxybenzaldehyde is the most sensitive to temperature under the condition of 40% of acetic acid concentration, and increases with increased concentration of acetic acid. The solubility data of terephthalic acid and 1,4-carboxybenzaldehyde in mixed solvent of acetic acid and water were correlated by modified Apelblat equation, which gave good agreement with all experimental data.

Key words: terephthalic acid, 1,4-carboxybenzaldehyde;solubility;acetic acid, water, Apelblat equation

摘要： 测定了420-505K温度范围内,对苯二甲酸和对羧基苯甲醛在醋酸水溶液中溶解度。在70%-100%醋酸水溶液中,70%醋酸使对苯二甲酸的溶解度对温度最敏感,随着醋酸浓度增加,对苯二甲酸的溶解度减少。当温度低于470K时,对苯二甲酸在水中的溶解性低于醋酸中的溶解度;温度高于470K时,对苯二甲酸在水中的溶解性对温度敏感明显提高。40%醋酸使对羧基苯甲醛的溶解度对温度最敏感, 随着醋酸浓度增加, 对羧基苯甲醛的溶解度增加。实验数据用修正的Apelblat方程进行了对苯二甲酸和对羧基苯甲醛在醋酸水溶液中溶解度关联,计算与实验值吻合良好。

关键词: 对苯二甲酸, 对羧基苯甲醛, 溶解度, 醋酸, 水, Apelblat方程