CORRELATION OF GAS SOLUBILITIES IN WATER AND METHANOL AT HIGH-PRESSURE

A random-nonrandom-mixture equation for the Helmholtz energy of a fluid mixture is shown to correlate the solubility of inert and acidic gases in water and methanol quite accurately at pressures up to 300 bar. Further, the calculated Henry's law constants of the gases in water show good agreement with experimental data. The gas solubility model is a modification of our previous model. It contains three binary interaction parameters, one in the reduced density term and two in the attractive terms. When the nonrandom parameter vanishes the model reduces to the classical mixing rule. The model correlates vapor-liquid equilibria in binary and ternary hydrocarbon-methanol systems quite accurately. Refs.