Solubility of succinic acid in pure solvents and in mixed solvents as a function of temperature. Arthur Henrique Rodrigues Rezende; Lorena Cristina Péres Borges and Ricardo Francisco Pires Chemical Engineering Department, Federal University of Triângulo Mineiro. Av. Doutor Randolfo Borges Júnior, 1250, 38064-200, Univerdecidade, Uberaba-MG; tel. +55 34 91759249, e-mail: ricardo@icte.uftm.edu.br; Data corresponding solid-liquid equilibrium (SLE) of succinic acid in pure water, different aqueous solvent mixtures containing water + dimethylformamide (DMF) and pure DMF were measured with temperature range from 303.15K to 323.15K under atmospheric pressure by employing gravimetric method. The experimental results indicated that the solubility of succinic acid in aqueous solvent mixture increase with increasing both temperature and mass fraction of organic solvents. The experimental data were well-correlated with the rational models to accounted the nonideality of the systems Introduction Succinic acid, also called butanedioic acid or amber acid, is a dicarboxylic acid of molecular formula is C 4 H 6 O 4 that is an important industrial chemical. The succinic acid is widely distributed in almost all plant and animal tissues and that plays a significant role in intermediary metabolism. In addition, succinic acid has larger applications in the medicine, pesticides, sensitive material, spices and food additives. As know, aqueous solubility is an important parameter in the separation and crystallization process of electrolytes. However, the purification process of succinic requires a large number of accurate solubility data. This work is mainly aimed to measure the solubility of succinic acid in mixed solvents as a function of temperature and test the capability of the solubility correlation models (HEIDMAN et. al., 1985; YAWS et. al., 1993) to correlated the experimental data. Solubility data of acid compounds have a broad application and importance in the pharmaceutical industry. 2,4 A variety of pure solvents, including water and solvent mixtures, can usually be employed in a particular crystallization process during the manufacturing of pharmaceuticals. 3,4 Measurements of acid solubilities in water and aqueous solutions have been receiving a growing interest. Although there are some experimental phase equilibrium data in aqueous solutions of acid compounds, 1-4 very little are available for those with no aqueous media. In this work solubility of succinic acid was measured in pure water, pure dimethylformamide (DMF) and in binary mixtures containing water and DMF. The experiments were performed in a temperature range of 303.15K to