Separation of azeotrope (2,2,3,3-tetrafluoro-1-propanol + water): Isobaric vapour-liquid phase equilibrium measurements and azeotropic distillation

摘要

In this work, chloroform and p-xylene were selected as azeotropic agents to separate the azeotrope of {2,2,3,3-tetrafluoro-1-propanol (TFP) + water} by azeotropic distillation. The isobaric vapour-liquid equilibrium data for the binary systems of (TFP + water), (TFP + chloroform), and (TFP + p-xylene) were determined at 101.3 kPa by a modified Rose type recirculating still. The thermodynamic consistency of the experimental data was checked by the Herington, van Ness, infinite dilution, and pure component consistency method. The experimental results were correlated by the NRTL, UNIQUAC and Wilson activity coefficient models, and the binary interaction parameters of the three models were regressed. All the correlated results by the NRTL, UNIQUAC, and Wilson models show good agreement with the experimental data. Furthermore, the distillation synthesis ternary maps for the systems (TFP + water + chloroform) and the (TFP + water + p-xylene) were obtained with the regressed interaction parameters of the NRTL model, and two distillation processes were presented to separate the azeotrope of (TFP + water). (C) 2017 Elsevier Ltd.