Modelling (vapour + liquid) and (vapour + liquid + liquid) equilibria of {water (H_2O) + methanol (MeOH) + dimethyl ether (DME) + carbon dioxide (CO_2)} quaternary system using the Peng-Robinson EoS with Wong-Sandler mixing rule

摘要

The (vapour + liquid) equilibria (VLE) and (vapour + liquid + liquid) equilibria (VLLE) binary data from literature were correlated using the Peng-Robinson (PR) equation of state (EoS) with the Wong-Sandler mixing rule (WS). Two group contribution activity models were used in the PRWS: UNIFAC-PSRK and UNIFAC-Lby. The systems were successfully extrapolated from the binary systems to ternary and quaternary systems. Results indicate that the PRWS-UNIFAC-PSRK generally displays a better performance than the PRWS-UNIFAC-Lby.