Isobaric Vapor–Liquid Equilibria for Binary Mixtures of Adiponitrile + 2-Methylglutaronitrile and Adiponitrile + Trans-3-pentenenitrile at 5 kPa and 10 kPa

Abstract

The isobaric vapor−liquid equilibria (VLE) of two binary mixtures (adiponitrile + 2-methylglutaronitrile and adiponitrile + trans-3-pentenenitrile) at 5 and 10 kPa were measured using a modified Rose−Williams still. The thermodynamic consistency of the VLE data was tested by the Wisniak method and the Fredenslund method. The isobaric VLE data were correlated with four activity coefficient models of Margules, van Laar, Wilson, and NRTL, and the parameters of the models were obtained by the ordinary least-squares method. The isobaric VLE data were compared with the original UNIFAC predictive model. Furthermore, the excess Gibbs free energy of studied mixtures was determined. The RMST and RMSy 1 were determined to evaluate the regression results. The results show that the Wilson model has a better correlation effect than other models.

Isobaric Vapor–Liquid Equilibrium of Binary Mixtures of 2-Methylpentanedioic Acid Dimethyl Ester and Dimethyl Adipate at 101.3, 50.0, 30.0, and 10.0 kPa

“…The vacuum vapor–liquid equilibrium measurement system used in this experiment is divided into two parts (Figure ). The first part is the vapor–liquid phase equilibrium device, including the rose-type vapor–liquid phase equilibrium still and condenser . The second part is the KNF remote wireless vacuum mixture (KNF SC-950, Germany), with a precision of 0.1 kPa.…”

“…The first part is the vapor− liquid phase equilibrium device, including the rose-type vapor− liquid phase equilibrium still and condenser. 12 The second part is the KNF remote wireless vacuum mixture (KNF SC-950, Germany), with a precision of 0. environment of the whole system. The precision mercury thermometer was used for temperature measurement with an accuracy of 0.1 K. A series of mixed solutions with molar concentrations were accurately weighed using an analytical balance.…”