The solubility of mercaptosuccinic acid in water + (methanol, ethanol, acetone) mixtures from (278.15 to 333.15 K)

• The solubility of mercaptosuccinic acid in different solvents was investigated.
• The Apelblat equation and λh equation were used to correlate the solubility.
• The λh equation correlates the solubilities data much better than Apelblat equation.
• The solution process in the selected solvents was endothermic.

The solubilities of mercaptosuccinic acid in binary solvent mixtures consisting of water + methanol; water + ethanol; and water + acetone were determined by a dynamic method over the temperature from 278.15 to 333.15 K. The solubility data were correlated with the modified Apelblat equation and the semi-empirical Buchowski–Ksiazczak λh equation. The Buchowski–Ksiazczak λh equation can regress the solubility data much better than Apelblat equation. The calculated values are in good agreement with the experimental values. This study provides valuable data for the mercaptosuccinic acid purification by the preferential crystallization procedure.