Phase Equilibrium of a Water–$n$-Hexane System in the Region of Lower Locus of Critical Points

The $PVT$ data for a water–$n$-hexane system are obtained using a constant-volume piezometer in the temperature range from $310$ to $680$ K and at a pressure of up to $60$ MPa in the region of the lower locus of the critical points. The lines of liquid–liquid and liquid–gas phase equilibria and their critical parameters are determined.