THERMODYNAMIC DESCRIPTION OF H2O-GAS BINA RY-SYSTEMS BY MEANS OF THE REDLICH-KWONG EQUATION OVER A WIDE-RANGE OF PARAMETERS OF STATE

A thermodynamic description of binary systems H2O-neutral species base d on the Redlich-Kwong equation is proposed. This approach uses only t he thermodynamics of pure components and no fitting parameters for H2O -nonpolar gas (CO2, H-2) mixtures. To describe dissolved, weakly disso ciated polar molecules (H2SO0), a small correction independent of temp erature and pressure is needed. With this approach, even neutral speci es of strong electrolytes (HCl0, NaCl0) can be described. The approach is valid from 100 degrees to 600 degrees C and 1 to 4000 bar. Using t his method, it is possible to calculate not only thermodynamic propert ies of components at infinite dilution, but their concentration depend encies as well. This point is of principal importance for studying the chemistry of natural fluids enriched with volatile components.