Vapor–liquid equilibria determination for a hydrofluoroether with several alcohols

A small-capacity apparatus for vapor–liquid equilibrium (VLE) measurement was developed. The overall charge of the still with a provision for vapor and liquid recirculations was about 38 cm3 of the solution. The performance of the proposed apparatus was tested by determining the VLE for the methanol+benzene system at 101.3 kPa. The results obtained were satisfactory. The isobaric VLE were measured for three binary systems, CH3OCH(CF3)2 (1)+methanol (2), CH3OCH(CF3)2 (1)+ethanol (2) and CH3OCH(CF3)2 (1)+2-propanol (2) at 101.3 kPa using the proposed apparatus. All three binary isobaric systems form a minimum boiling azeotrope. The azeotropic points are x1(AZ)=0.711 mole fraction and T(AZ)=318.36 K for CH3OCH(CF3)2 (1)+methanol(2) system, x1(AZ)=0.859 mole fraction and T(AZ)=322.21 K for CH3OCH(CF3)2 (1)+ethanol(2) system, and x1(AZ)=0.918 mole fraction and T(AZ)=323.44 K for CH3OCH(CF3)2 (1)+2-propanol(2).