Solubility of Veratric Acid in Eight Monosolvents and Ethanol + 1-Butanol at Various Temperatures

Abstract

The solubility of veratric acid (3,4-dimethoxybenzoic acid, with measured melting point of 453.12 K by differential scanning calorimetry, DSC) in eight monosolvents, including ethanol, 1-propanol, 2-propanol, 1-butanol, 2-methyl-1-propanol, methyl acetate, ethyl acetate, and 2-butanone, and binary mixtures of ethanol + 1-butanol was determined at (278 to 323) K and atmospheric pressure using a dynamic method. The modified Apelblat equation and two local composition models (NRTL and UNIQUAC) were used to correlate the solubility of veratric acid in pure solvents. The modified Apelblat and the Jouyban–Acree model were used to correlate the solute solubility in binary mixtures. A combination of the Jouyban–Acree model and van’t Hoff equation was used to predict solubility data in the mixed solvents at different temperatures and gives a reasonable prediction. Each of the correlation equations selected gives a good description of the relationship of solubility and the temperature, and correlated data of the mo...