Measurement of solubility of terephthalic acid in water under hydrothermal conditions

Le résumé fourni par la source

Here, the solubility of terephthalic acid (TPA) in water was measured under hydrothermal conditions at temperatures from 423.15 K to 623.15 K by a semi-dynamic gravimetric system. The whole process, using water as the only solvent, was considered safe and environmentally friendly. The results indicated that the TPA solubility in water increased exponentially with the temperature. Particularly, at 573.15 K (10 MPa) and 623.15 K (20 MPa), the water solubility of TPA was measured to be 108.1 and 347.4 g kg −1 , respectively. It was the first time to measure the TPA solubility in water at over 523.15 K experimentally. Fitted curves for the TPA solubility in water as functions of temperature and water density were plotted, and the thermodynamic properties for the dissolution of TPA into water were obtained and plotted. The TPA solubility results obtained would be helpful to improve the production or recycling of TPA under hydrothermal conditions. • Water solubility of terephthalic acid (TPA) at different conditions was measured. • The conditions used in this study were 423 K to 573 K at 10 MPa and 623 K at 20 MPa. • A semi-dynamic gravimetric system was employed using water as the only solvent. • Solubility curves as functions of temperature and water density were plotted. • The thermodynamic properties for the dissolution of TPA into water were calculated.

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