Vapor-Liquid Equilibria Of The Ch4 + Co2 + H2s Ternary System With Two Different Global Compositions: Experiments And Modeling

The vapor-liquid equilibrium for two mixtures containing methane, carbon dioxide, and hydrogen sulfide was determined experimentally by a static-analytic method. Thirty-one data points were acquired for a range of temperatures from 243 to 333 K at pressures up to 11 MPa. The measured data were correlated with the Peng-Robinson equation of state (EoS) and different mixing rules, which led to the conclusion that a cubic EoS could simultaneously predict the existence of a three-phase region and two critical points on the constant-composition, two-phase boundary curve.