PREDICTION OF GAS SOLUBILITIES USING THE LCVM EQUATION OF STATE EXCESS GIBBS FREE-ENERGY MODEL

A recently developed EoS/G(E) model, the LCVM one, is applied to the p rediction of Henry constants of nine gases (O-2, N-2, CO2, CO, H2S, CH 4, C2H6, C3H8, C4H10) in a wide range of pure and mixed solvents, incl uding heavy hydrocarbons, polar solvents, and water. When not availabl e, LCVM interaction parameters are estimated by correlating vapor-liqu id equilibrium data. LCVM yields very good predictions for Henry const ants in pure solvents, with typical errors less than 8%; it also perfo rms very satisfactorily in the prediction of high-pressure vapor-liqui d equilibria. On the other hand, widely-used EoS/G(E) models, such as PSRK and MHV2, are shown to result in progressively poorer behavior wi th increasing system asymmetry. Finally, LCVM predictions for Henry co nstants in mixed solvents are also satisfactory, especially when combi ned with the method of Catte et al. The results presented here, combin ed with those from previous ones, render LCVM a valuable tool for pred icting vapor-liquid equilibria.