Solubility Behavior and Data Correlation of Sulfinpyrazone in Thirteen Pure Solvents from 283.15 to 323.15 K

This present work is the investigation of the solubility for sulfinpyrazone in 13 monosolvents, water, methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, acetone, acetonitrile, 2-butanone, methyl acetate, ethyl acetate, and n-pentanol, via a static gravimetric method at temperatures ranging from 283.15 to 323.15 K under atmospheric pressure. The solubility magnitudes are in positive correlation with the absolute temperature in each solvent. Within the experimental temperature range, the solubility is the highest in acetonitrile (103.286 × 10–3 at 323.15 K) and lowest in water (0.03597 × 10–3 at 283.15 K). The rough sequences of solubility values in different solvents are methanol > n-pentanol > n-propanol > n-butanol > sec-butanol > ethanol > isopropanol and acetonitrile > acetone > 2-butanone > methyl acetate > ethyl acetate > water in alcohols and nonalcohol solvents, respectively. The results demonstrate that the solubility behaviors of sulfinpyrazone are affected by the combined effects of several factors involving solvent polarity, solvent–solvent intermolecular interactions (quantitatively characterized by cohesive energy density), and molecular structures (molecular sizes and properties of functional groups) of solvents and solutes. Additionally, the Apelblat equation and Yaws equation were employed to correlate the experimental solubility data of sulfinpyrazone in each investigated solvent. The results of average relative deviations and root-mean-square deviations as well as the values of Akaike Information Criterion and Akaike weights reveal that the calculated solubility values by the Apelblat equation are more consistent with the experimental data compared to those by the Yaws equation.