Vapor−Liquid Equilibria on Four Binary Systems: 2-Phenylpropionaldehyde + Phenol, Propylene Glycol Monomethyl Ether + Nitroethane, Dimethyl Ether + Propylene, and N-Butyric Acid + Propionic Acid

• Published in: Journal of chemical and engineering data 2006-11, Vol.51 (6), p.1966-1972
• Main Authors: Giles, Neil F, Wilson, Grant M
• Format: Article
• Language: English
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je050327l

Vapor−liquid equilibria are reported for the following four systems:  2-phenylpropionaldehyde + phenol at 100 °C and 150 °C; propylene glycol monomethyl ether + nitroethane at 40 °C and 80 °C; dimethyl ether + propylene at −20 °C and 20 °C; and n-butyric acid + propionic acid at 100 °C and 140 °C. The system pressure and temperature were measured at several charge compositions along a given isotherm for each system. Equilibrium vapor- and liquid-phase compositions were derived from the measured PTx data using the Soave equation of state to represent the vapor phase and the Wilson or three-parameter Redlich−Kister activity coefficient model to represent the liquid phase. Vapor-phase dimerization of the carboxylic acids was accounted for in reducing the n-butyric acid + propionic acid PTx data. A single Txy data point was also measured for this system at each temperature by withdrawing and analyzing multiple samples from the equilibrium vapor and liquid phases.