对苯二甲酸和对羧基苯甲醛在醋酸水溶液中的溶解度

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。

Solubilities of terephthalic acid and 1,4-carboxybenzaldehyde in binary solvent mixture of acetic acid and water

Using the static analytical method,the solubilities of terephthalic acid and 1,4-carboxybenzaldehyde in binary solvent mixtures of acetic acid and water were measured.The experimental temperature ranged from 420 K to 505 K,and the mass fraction of acetic acid in the solvent mixtures ranged from 0 to 100% for terephthalic acid and from 40% to 100% for 1,4-carboxybenzaldehyde.It is shown that as the mass fraction of acetic acid increases from 70% to 100%,the solubility of terephthalic acid reduces gradually within the temperature range.Above 470 K,the solubility of terephthalic acid increases rapidly with temperature,and at 70% mass fraction of acetic acid the solubility is most sensitive to temperature.The solubility of terephthalic acid in water shows different characteristics from that in binary solvent mixtures of acetic acid and water.Below 470 K,the solubility of terephthalic acid is less than that in the aqueous acetic acid solution.When the mass fraction of acetic acid increases from 40% to 100%,the solubility of 1,4-carboxybenzaldehyde increases gradually,but it is not sensitive to temperature.All solubility data of terephthalic acid and 1,4-carboxybenzaldehyde are correlated by modified Apelblat equation,which is in good agreement with experimental data.