A TECHNIQUE FOR CALCULATING THE PHASE EQUILIBRIUM OF MULTICOMPONENT VAPOR-LIQUID SYSTEMS

摘要

This paper describes a technique of calculating the phase equilibrium of a multicomponent vapor-liquid system based on fundamental thermodynamic ratios and complemented with the Perturbed Chain Statistical Associating Fluid Theory (PC-SAFT) equation of state. The technique is intended for describing the phase state of multicomponent oil and gas systems at various stages of production, preparation and transportation. The technique is also applied to define the metrological characteristics of measuring instruments of oil and gas water mixtures in reference devices of mass flow of gas-liquid systems.