Critical temperatures and pressures of the ethane–n‐heptane system

The critical temperatures and critical pressures of the ethane—n‐heptane system have been established experimentally with a visual PVT cell which utilized mercury as the pressurizing medium. The information obtained from the relative hydrocarbon volumes of the vapor and liquid phases permitted the measurement of these critical values. Five different binary compositions were used to establish the critical temperature locus and critical pressure locus for compositions of x 2 ≥ 0.655. The critical constants obtained in this study have been compared with corresponding values from the work of Kay (1) .