Experimental determination of oxygen and nitrogen solubility in organic solvents up to 10 MPa at temperatures between 298 K and 398 K

Oxygen solubility in methanol, n-propanol, dibutyl ether, toluene, and octane, and nitrogen solubility in ethanol, n-propanol and 2-methyltetrahydrofuran was measured at pressures up to 10 MPa in the temperature range between 298 K and 398 K using the static synthetic method. The experimental results were used to extend the range of applicability of the Soave–Redlich–Kwong (PSRK) model for the prediction of air solubility in organic solvents and solvent mixtures by fitting the missing gas–solvent group interaction parameters. The required pressure range of gas solubility data for fitting the PSRK group interaction parameters was defined by analysing the significance of the data for the optimized parameters. The applied experimental method was analysed in detail since its use at higher pressures requires the consideration of the partial molar volumes of the dissolved gases when solving the mass and volume balance equations during the data treatment.