EQUATIONS FOR CALCULATION OF EQUILIBRIUM LIQUID-VAPOR IN BINARY MIXTURES OF AIR COMPONENTS

Abstract

A form of equation for description of data on phase equilibrium liquid-vapor in binary mixtures at subcritical temperatures of components was proposed. Equation represents the mixture pressure as a sum of linear combination of components saturation pressure values and correcting function of composition and temperature. It allows satisfy automatically the limiting condition on smooth passage of mixture pressure to pressure of component at its concentration increase to 100 %. The efficiency of equation is shown on example of description on experimental data of phase equilibrium in mixtures nitrogen-oxygen at temperatures 65…120 K, nitrogen-argon at 77…120 К and oxygen-argon at 80…120 К. The compiled equations permit to calculate with acceptable exactness any parameter of phase equilibrium (р, Т, х or у) at given two others. The equations are recommended for optimizing calculations of air separating plants and for creation of corresponding automatically systems of management.