Polyester

Physics

Geology

Activity coefficient

Organic chemistry

Atmospheric pressure

Dimethyl sulfoxide

Analytical Chemistry (journal)

Isothermal process

Oceanography

Solubility

Aqueous solution

Chemistry

Tetrahydrofuran

Terephthalic acid

Solvent

Non-random two-liquid model

Chromatography

Thermodynamics

Journal of Chemical & Engineering Data

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.

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