Vapor-liquid equilibrium at 75 °C for binary and ternary systems containing benzene, n-heptane and n-propyl alcohol.

Abstract

Binary and ternary vapor-liquid equilibrium data were determined at 75°C for the mixture of benzene, n-heptane and n-propyl alcohol using a modified Gillespie type of still. The equilibrium data for the three binary and the ternary systems are considered to be thermodynamically consistent as shown from the consistency test. Correlating the data with the Redlich-Kister equations for the binary and ternary systems shows that these equations would represent the data accurately over the entire range of compositions. The experimental results indicate that two binary systems, namely, n-heptane-n-propyl alcohol and n-propyl alcohol-benzene form an azeotrope at 75°C. Nevertheless no ternary azeotrope is found from the experiment.