Measurement and Correlation of the Solubility of Terephthalic Acid in Six Pure Solvents and Five Binary Mixtures

• Published in: Journal of chemical and engineering data 2021-09, Vol.66 (9), p.3512-3519
• Main Authors: Celante, Dian, Diehl, Lisiane O, Brondani, Leoni N, Bizzi, Cezar A, de Castilhos, Fernanda
• Format: Article
• Language: English
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/acs.jced.1c00373

The goal of this work was to measure the solubility of terephthalic acid (TA) in six pure solvents (2-ethyl-1-hexanol (2EH), dimethyl sulfoxide, 1-methyl-2-pyrrolidinone, N,N-dimethylformamide, N,N-dimethylacetamide, and pyridine) and five binary mixtures (composed of 2EH and 5 or 10% w/w another solvent) from 313.15 to 363.15 K at atmospheric pressure 101.3 kPa. Experiments were performed by an isothermal method employing an in situ filter to sample only the homogeneous liquid phase, and samples were analyzed by liquid chromatography. Solubility of TA in 2EH is 100-fold lower when compared to the other studied solvents, but a binary mixture composed of 2EH and 5 or 10% w/w (solute-free basis) dimethyl sulfoxide could increase solubility up to 61 and 165%, respectively. Furthermore, the parameters of λh, Apelblat, Wilson, and NRTL models were estimated. All of the models fitted the experimental data with good agreement, but the nonrandom two-liquid (NRTL) model was the most suitable to represent experimental data.