Phase Behavior in Fluid Mixtures at High Pressures. I. Experimental

摘要

The work reported here represents part of a long-term research objective of determining accurate experimental liquid-vapor phase equilibrium data on binary fluid mixtures in the temperature range 13-160 Kelvin and at pressures up to 4000 atm. Systems under investigation are those in which, under these conditions, one component is normally a gas and the other is a liquid. These substances are among those with the lowest critical temperatures and the simplest molecular structures. The gas-liquid critical curve extending into pressure-temperature-composition (PTX) space, from the critical point of argon, has been well-defined by eleven experimental points. It was found to pass through a minimum in temperature at 147.1K, and a pressure of 440 atm. These results confirm the presence of fluid-fluid equilibrium in this system at temperatures above the critical temperature of argon (150.86K). Additionally, the three phase boundary solid-liquid-gas (solid-fluid-fluid) has been determined at pressures to 4000 atm. (Author)