Experimental Measurement and Modeling of Ternary Vapor–Liquid Equilibrium for Water + 2-Propanol + Glycerol

Isobaric vapor–liquid equilibrium (VLE) data for the ternary system water + 2-propanol + glycerol are reported at 100 kPa. The ternary VLE data, together with literature values of binary VLE and activity coefficients at infinite dilution for water + 2-propanol, were correlated by the NRTL activity coefficient model. The correlation appears to be satisfactory for all the data. The experimental results were compared graphically with those of calculations, showing good agreement. With the addition of glycerol, the azeotrope of water + 2-propanol can be removed at a glycerol mass fraction of 0.229. Glycerol is a potentially effective entrainer for dehydration of 2-propanol by extractive distillation.