VAPOR - LIQUID EQUILIBRIA IN MIXTURES OF LIGHT GASES AND HEAVY ORGANIC SUBSTANCES AT ELEVATED TEMPERATURES AND PRESSURES
Abstract
Because of increased interest in coal conversion processes, there is a growing need for basic information on the vapor-liquid equilibrium of mixtures containing light gases and heavy organic substances. Such information is required at the elevated temperatures and pressures at which coal conversion processes are carried out. In this work we experimentally determined vapor-liquid equilibrium data for a variety of systems, including five systems of nitrogen + heavy hydrocarbon binary mixtures, four systems of carbon dioxide + heavy hydrocarbon binary mixtures, two coal liquid systems, and three systems of hydrogen and coal liquid mixtures. To correlate these new data and existing literature data, a new cubic equation of state is developed. This equation applies the concept of chain-of-rotators equation to include the rotational contribution of molecular motion in addition to the repulsive and attractive contributions. Carnahan-Starling's repulsive contribution and Chien's rotational contribution are simplified to give the final equation a cubic form. The new equation represents the vapor pressure and saturated liquid density for diverse substances over the entire liquid range. Application is made to mixtures with emphasis on fluid phase equilibria.
Degree
Ph.D.
Subject Area
Chemical engineering
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