Isobaric Vapor–Liquid Equilibrium for Binary Mixtures Composed of Pentamethylene Diisocyanate, 5-Chloropentyl Isocyanate, and Chlorobenzene at 10 kPa

Abstract

Isobaric vapor–liquid equilibrium (VLE) data were collected for three binary mixtures: pentamethylene diisocyanate and 5-chloropentyl isocyanate, pentamethylene diisocyanate and chlorobenzene, and 5-chloropentyl isocyanate and chlorobenzene. These measurements were conducted using a modified Rose-type recirculating still, within a temperature range of 336.15–435.15 K and at 10 kPa. The uncertainty of temperature and pressure was divided into 0.6 K and 0.1 kPa. No azeotropic behavior was observed during the experiments. The experimental results were regressed using the maximum likelihood function and were correlated with three activity coefficient models: NRTL, Wilson, and UNIQUAC, from which the corresponding binary interaction parameters were estimated. Data of all binary systems passed thermodynamic consistency tests, including the Herington area test and the Van Ness point method. The root-mean-square deviations of the vapor phase mole fraction and equilibrium temperature were less than 0.0107 and 0.82 K, which demonstrated that the experimental data were well correlated with all three models.