Linear Variation of Isochoric Lines and Determination of Phase Transitions in Syze Asymmetric Mixtures

ALEXIS VELEZ; SUSANA ESPINOSA; SELVA PEREDA; ESTEBAN A. BRIGNOLE

Anales de la Academia Nacional de Ciencias Exactas, Físicas y Naturales de Buenos Aires

ACADEMIA NACIONAL DE CIENCIAS EXACTAS FÍSICAS Y NATURALES

Año: 2009 p. 49 - 52

0365-1185

The study of isochoric lines for the determination of densities of reactive mixtures provided strong evidence that the change in the slope of the pressure vs. temperature lines can be used to determine the phase boundaries of size asymmetric mixtures. It was found that isochoric pressure vs. temperature lines, in the gas-liquid region, are virtually linear.  This method can be applied to binary or multicomponent mixtures. Based on this a methodology was developed to determine phase transition conditions when rather extreme values of pressure and temperature must be investigated. The observed experimental behavior is also supported by the computation of pressure vs. temperature variation of isochoric flashes for asymmetric mixtures, using different equations of state.