Research On The Vapor-liquid Equilibrium Of Water+Tetrahydrofuran+Solvent System

Tetrahydrofuran is an important organic solvent, and it has extensiveapplications. This paper studies the effect of the various solvent onvapor-liquid equilibria of the water+tetrahydrofuran system, whichpropose the basic data sets and design foundation for the design ofextractive distillation.The feasibility of using ethanediol/1,4-butanediol/mixed-solvent asentrainers for the separation of the azeotropic mixtures of water andtetrahydrofura by extractive distillation is researched in this study.In this study, a new ebulliometer is used, and T, x, y data weremeasured for ternary systems containing water+tetrahydrofuran+ethanediol/1,4-butanediol/mixed-solvent (80%ethanediol and20%potassium acetate) at101.3kPa, while the quality content of solventcalculated on the tetrahydrofuran free basis, w3=0.1,0.2,0.4,0.5,0.6,activity coefficients of the volatile components as well as the relativevolatility were obtained from the experimental data, NRTL parameterswas correlated. Results showed the solvent can decrease the activity coefficient of water, while increase the activity coefficient oftetrahydrofuran, and therefore increase relative volatility oftetrahydrofuran (2) to water (1) a21obviously.Among the systems investigated, mixed-solvent enhances relativevolatility of the volatile components favourably，have the best separationeffect. The VLE data were correlated by the NRTL model. Differentsolvent have different effects on water-tetrahydrofuran system, the resultsare as follows:Mixed-solvent> ethanediol>1,4-butanediol...