The report describes a thermodynamic model developed to predict phase-equilibrium behavior in a methanol/carbon-dioxide/nitrogen/hydrogen-sulfide system based on parameters determined from binary vapor/liquid equilibrium data available in the literature. Model predictions are compared with actual experimental data. Predicted values show an average deviation from experimental data of 21% for vapor compositions and 10% for total pressures, indicating the possibility of ternary effects not accounted for by the model. (The model is to be used in conjunction with a coal-gasification/gas-cleaning facility constructed at North Carolina State University as part of a study funded by the EPA. The overall objective of the project is to characterize completely the gaseous and condensed phase emissions from typical coal-gasification/gas-cleaning processes and to determine how emissions depend on process parameters. To describe and evaluate operations involved in the removal of acid gas constituents from the crude synthesis gas, information is needed concerning the equilibrium behavior of these constituents with the particular solvent used in the removal unit; hence, the model.)

"North Carolina State University, Department of Chemical Engineering." "April 1979." Includes bibliographical references. "Grant no. R804811, program element no. EHE623A."