CORRELATION OF SOLUBILITIES FOR CO2 AND NH3 IN H2O USING SOAVE-REDLICH-KWONG EQUATION OF STATE WITH MHV2 MIXING RULE

The flexibility and applicability of the modified Huron-Vidal second o rder (MHV2) mixing rule have been examined for the correlation of solu bilities for CO2 and NH3 in H2O as an example of a system containing v olatile weak electrolytes. The MHV2 mixing rule is one of the excess G ibbs energy (g(E)) mixing rules. The g(E) mixing rules are well known to be able to predict vapor-liquid equilibria (VLE) of polar or non-po lar mixture systems under high pressure. We have used to Soave-Redlich -Kwong equation of state (SRK-EOS) with the MHV2 mixing rule. Assuming a series reaction between CO2 and NH3 in the aqueous phase and the te mperature dependence of the equilibrium constant, the solubility behav ior of the CO2-NH3-H2O system can be correlated with reasonable accura cy.