Isobaric Vapor-Liquid Equilibrium Data for Tetrahydrofuran plus Acetic Acid and Tetrahydrofuran plus Trichloroethylene Mixtures

Vapor-liquid equilibrium (VLE) data for the binary systems tetrahydrofuran (THF) + acetic acid (AA) and THF + trichloroethylene (TCE) were measured under isobaric conditions using an ebulliometer. The boiling temperatures for the systems (THF + AA/ THF + TCE) are reported for 13/15 compositions and five/six different pressures ranging from 50.2/60.0 to 101.1/101.3 kPa, respectively. The THF + AA system shows simple phase behavior with no azeotrope formation. The THF + TCE system does not exhibit azeotrope formation but seems to have a pinch point close to the pure end of TCE. The nonrandom two-liquid (NRTL) and universal quasichemical (UNIQUAC) activity coefficient models were used to accurately fit the binary (PTx) data. Both models were able to fit the binary VLE data satisfactorily. However, the NRTL model was found to be slightly better than UNIQUAC model in fitting the VLE data for both systems. The results can be used for designing liquid-liquid extraction and distillation processes involving mixtures of THF, AA, and TCE. [GRAPHICS]

Automated summary

Vapor-liquid equilibrium data were measured for two binary systems THF + AA and THF + TCE using an ebulliometer under isobaric conditions. The boiling temperatures were reported for different compositions and pressures. The NRTL and UNIQUAC models were used to fit the data, with NRTL model found to be slightly better. These results are important for designing liquid-liquid extraction and distillation processes involving THF, AA, and TCE mixtures.