Abstract
Binary liquid-vapor mixtures for which the overall density is held constant are shown to behave as systems with 1 degree of freedom similar to a pure fluid at liquid-vapor coexistence. Isochoric data (at which the overal density is held at the critical value) for the mixtures of nitrogen+methane generated via a modified Leung-Griffiths model are represented in the critical region down to one-half the critical pressure by simple equations for pressure, liquid density, critical liquid volume fraction, and the product of liquid density and liquid mole fraction. A procedure is presented for the derivation of dew and bubble point pressures and densities from these representations given the overall composition and temperature. Retrograde behavior is represented. Comparisons of calculated values with experimental dew and bubble point data for nitrogen+methane mixtures are made
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