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In this work, the solubility of carbon dioxide, CO 2 , in pentaerythritol tetrapentanoate (PEC5) and in pentaerythritol tetra(2-ethylhexanoate) (PEBE8) has been performed from (283 to 333) K and pressures up to 7 MPa in a new high-pressure gas solubility apparatus. The results show that in the present analyzed range CO 2 is highly soluble in these oils and that the solubility expressed as CO 2 mole fraction is practically not dependent on the branching of the acid chain, whereas it increases slightly with the length of the PE acid chains in the present range of compositions. The gas solubility data were satisfactorily correlated with the Soave-Redlich-Kwong (SRK) equation of state (EOS) using the conventional quadratic mixing rule with two interaction parameters for each temperature.

The solubility of 1,1,1,2-tetrafluoroethane in triethylene glycol dimethyl ether was measured by the static method in the temperature range (283.15 to 353.15) K. Triethylene glycol dimethyl ether was completely miscible with 1,1,1,2-tetrafluorethane in the range of temperatures and pressures studied. All experimental solubility data were correlated by the five-parameter NRTL equation with a very small overall average absolute deviation. This binary system exhibited large negative deviations from Raoult's law.

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Solubilities of noble gases (He, Ne, Ar, Kr, and Xe) in mixtures of water + 2,2,2-trifluoroethanol (TFE) at 298.15 K and 101.33 kPa partial pressure of gas are reported. Our procedure for the estimation of these solubilities from the experimental data is described in detail. From these data, the Henry's constants at the vapor pressure of water (the least volatile component), the standard changes in the Gibbs energy for both the solution process and the solvation process, and the so-called excess Henry's constant are calculated. Finally, three prediction methods are applied, and their results are compared and discussed.