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Abstract
A phase equilibrium model which will allow vapor-liquid equilibrium and liquid-liquid equilibrium calculations to be made over a broad range of operating conditions has been developed. The base equation is a Soavc-Rcdlich-Kwong equation of slate. Modifications are introduced. Model predictions ar: compared to literature data for two binary pairs and three multicomponent systems. Examples will include: 1) the hydrogen-water binary pair, 2) the ammonia-water binary pair from below the critical of ammonia to above the critical of ammonia, and 3) three examples from an operating unit including one liquid-liquid system.