Solubilities of several non-polar gases in mixtures water + 2,2,2-trifluoroethanol at 298.15 K and 101.33 kPa

Solubilities of nine nonpolar gases (H2, N2, O2, CH4, C2H6, C2H4, CF4, SF6, and CO2) in mixtures of water + 2,2,2-trifluoroethanol (TFE) at 298.15 K and 101.33 kPa partial pressure of gas are reported. A polynomial dependence of the solubilities on the mole fraction of the binary liquid mixture is found. The Henry's constants at the vapour pressure of water, the standard changes in the Gibbs energy for the solution process and for the solvation process, and the so-called excess Henry's constant are calculated. Gibbs energies for the solution process and excess Henry's constants have been calculated using the Scaled Particle Theory (SPT).

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Solubility of H2, N2, O2, CH4, C2H4, C2H6, CF4, SF6 and CO2 in water + TFE at 298.15 K and 101.33 kPa was determined. ► Changes in the Gibbs energies of the solution and solvation processes were calculated. ► ln KH3,12E are negative except in the zone highly dilute in TFE (x2<0.04x2<0.04). ► Remarkable features arise from the behaviour of ΔG¯solv for CO2, CF4 and SF6. ► SPT provides acceptable results despite its simplicity.