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

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