Abstract
When conducting the removal process of free toluene diisocyanate(F-TDI)from polyurethane prepolymer by azeotropic distillation, the isobaric vapor-liquid equilibrium (VLE) data and basic thermodynamic parameters for 2,4-TDI + entrainer are missing. Isobaric VLE data for 2,4-TDI/ethyl benzoate(EBZ), 2,4-TDI/diethyl succinate (DES) and 2,4-TDI /dimethyl adipate (DMA) were measured at 0.55 kPa by using a self-made recirculation still. The binary VLE data have passed the thermodynamic consist test proposed by the area method. The parameters and regression deviations for the UNIQUAC equation were obtained by data regression with simulation system of Aspen Plus. The average deviations of vapor mole fraction were 0.0067, 0.0083 and 0.0179, and the average absolute deviations of the predicted temperature were 0.7 K, 1.2 K and 0.5 K for the three groups, respectively. Furthermore, azeotropic systems were analyzed, and the azeotropic compositions and azeotropic conditions were provided for the azeotropic distillation of F-TDI separation.
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