MEASUREMENT AND CORRELATION OF GAS-LIQUID EQUILIBRIA IN MIXTURES OF LIGHT GASES AND HEAVY HYDROCARBONS

HERBERT M SEBASTIAN, Purdue University

Abstract

Because of increased interest in coal conversion processes there is a growing need for basic information on the vapor-liquid equilibria of mixtures containing light non-condensable gases and heavy aromatic hydrocarbons found in coal derived liquids. These phase equilibrium data are required at the elevated temperatures and pressures at which most coal conversion processes will be run. In this work we experimentally determine vapor-liquid equilibrium data for a variety of systems.-- (.) 9 CO(,2) + heavy hydrocarbon binaries (.) 2 CH(,4) + heavy hydrocarbon binaries (.) 1 H(,2) + heavy hydrocarbon binary (.) 1 H(,2) + CH(,4) + heavy hydrocarbon ternary (.) 1 H(,2) + CO(,2) + heavy hydrocarbon ternary (.) 5 H(,2) + coal liquid systems (.) 4 CH(,4) + coal liquid systems Using this new data and existing literature data we develop a solubility parameter based correlation of gas solubility for hydrogen, methane, and carbon dioxide. In this method we correlate the ratio of fugacity to mole fraction of the gas at zero pressure against the mixture solubility parameter and temperature. The high pressure fugacity is determined by adding a Poynting correction. The required partial volume of the gas is correlated against solubility parameter and temperature. The K-values of the light gases calculated from this new correlation deviate from experimental data by about six percent on the average, which is an improvement over the Chao-Seader and Grayson-Stread correlations which have been used previously. The new correlation is also used to predict the solubility of hydrogen and methane in coal liquids. These predictions also deviate from the experimental data by six percent on the average.

Degree

Ph.D.

Subject Area

Chemical engineering|Energy

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