Measurement and Correlation of the Solubility of Sodium 2-Chlorotoluene-4-sulfonate in Selected Pure Solvents and Aqueous Organic Solutions.

The solubilities of the sodium 2-chlorotoluene-4-sulfonate (CTSNa) in water, methanol, formic acid, dimethyl sulfoxide (DMSO), N,N-dimethylformamide (DMF), binary (methanol + water) mixed solvents, and binary (ethanol + water) mixed solvents were determined experimentally over the temperature range from (280 to 335) K at atmospheric pressure using a dynamic method. The mole fraction of water in the two solvent mixtures ranged from 0.0000 to 1.0000 and 0.2006 to 1.0000, respectively. A synergistic effect on CTSNa solubility was observed with the maximum solubility at solute-free mole fraction of ethanol x20 = 0.2082 and solute-free mole fraction of methanol x30 = 0.3985, respectively. The solubility data were correlated with the thermodynamic electrolyte nonrandom two-liquid (E-NRTL) model and the root-mean-square deviations of solubility temperature varied from (0.24 to 1.10) K. [ABSTRACT FROM AUTHOR]