Solubility of Isophthalic Acid and m-Toluic Acid in Eight Monobasic Alcohols: Experimental Measurements and Thermodynamic Modeling

Abstract

In this study, the solubility of isophthalic acid (IPA) and m-toluic acid (m-TA) in eight monobasic alcohols, methanol, ethanol, 1-propanol, iso-propanol, 1-butanol, iso-butanol, tertbutanol, and 2-butanol is measured under 101.3 kPa by the method of laser dynamics. The experimental temperature range is 294.35− 360.75 K. The measured data showed that the solubility of IPA and m-toluic acid increased with the increase of temperature in the measured temperature range. At the same temperature, the solubility of m-toluic acid in the same pure solvent is higher than that of IPA. The solubility of IPA and m-toluic acid in eight solvents decreased with the increase of the number of carbon atoms of the solvent. At the same temperature, the solubility ratio of mtoluic acid to IPA in iso-butanol is the highest in the same solvent, and the ratio was greater than 70, making it the best solvent for separating IPA and m-toluic acid. The Apelblat model, the Buchowski−Ksiazczak λh model, and the modified nonrandom two-liquid activity coefficient model were used to correlate the experimental data, and the calculated solubility was in good agreement with the measured result. The calculated solubilities were in good fit with the measured results. The thermodynamic properties were calculated, and the main contributor of the standard molar Gibbs energy of IPA and m-toluic acid in eight alcohols is enthalpy, about 55.40 to 82.86%.

The Role of Organic Vapor in the Water Uptake of Organic Aerosols

“…PTA, IPTA, and TPTA are soluble in organic solvents. In bulk solution, both PTA and IPTA are found to be freely soluble in ethanol, while TPTA is slightly soluble in ethanol at room temperature. The water uptake will be examined under subsaturated conditions using an H-TDMA and supersaturated conditions using a CCNC.…”