Solubility of gases in fluoroorganic alcohols. Part III. Solubilities of several non-polar gases in water¿+¿1, 1, 1, 3, 3, 3-hexafluoropropan-2-ol at 298.15¿K and 101.33¿kPa

Solubilities of the non-polar gases H2, N2, O2, CH4, C2H6, C2H4, CF4, SF6, and CO2 in the mixture (water + 1, 1, 1, 3, 3, 3-hexafluoropropan-2-ol) at the temperature of 298.15 K and 101.33 kPa partial pressure of gas are reported. A polynomial dependence of the solubilities on the molar fraction of the binary liquid mixture is found. The Henry''s constants at the vapor 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. The results have been compared with those obtained by Scaled Particle Theory (SPT). A method to compare the solubility of a gas in different liquids is proposed and applied to 2, 2, 2-trifluoroethanol and 1, 1, 1, 3, 3, 3-hexafluoropropan-2-ol

Solubilities of gases in cycloethers. The solubility of 13 nonpolar gases in 2, 5-dimethyltetrahydrofuran at 273.15 to 303.15¿K and 101.32¿kPa

The solubilities of gases in liquids are interesting, not only from a practical point of view, but also because they provide a rigorous touchstone to test the structural models on the liquid state. In this work the solubilities of 13 nonpolar gases, He, Ne, Ar, Kr, Xe, H2, D2, N2, CH4, C2H4, C2H6, CF4, and SF6, in 2, 5-dimethyltetrahydrofuran at five temperatures between (273.15 and 303.15) K and 101.32 kPa partial pressure of gas were measured and the associated thermodynamic functions were calculated. Correlation of data has been made and the capacity of prediction of several typical molecular models of liquids, namely, SPT model, perturbation theory, UNIFAC and COSMO-RS, specifically applied to gas solubilities, has been checked

Molar heat capacities of the mixture {1, 8-cineole + ethanol} at several temperatures and atmospheric pressure

Molar heat capacities at atmospheric pressure have been determined every 5 K for the mixture {1, 8-cineole (1) + ethanol (2)} in the temperature interval (304.7 to 324.5) K and the whole composition range with a Calvet type calorimeter Setaram C80. From the molar heat capacities, excess molar heat capacities have been calculated, their values being positive and increasing as the temperature rises. The solvation model COSMO-RS has been applied to predict the excess molar heat capacities. The model overestimates the values of the excess heat capacities but predicts well the trend of variation of the excess molar heat capacity with the temperature

Supercritical Fluid fractionation of mentha suaveolens: concentration of functional properties

Supercritial Antisolvent Fractionation process was optimiced for the concentration of Mentha suaveolens bioactives in two different fractions. Their composition was analysed with HPLC. The antimicrobial activity of these fractions was assayed. The SAF process fractionated M. suaveolens tincture in two enriched fractions in different bioactives concentrating those with antimicrobial activity in one of them.  El proceso de Fraccionamiento Supercrítico Antidisolvente  fue optimizado para la concentrar bioactivos de Mentha suaveolens en dos diferentes fracciones. Su composición fue analizada con HPLC. La actividad antimicrobiana de estas fracciones fue ensayada. El proceso supercrítico permitió fraccionar la tintura de esta planta en 2 fracciones enrriqueciendolas en diferentes bioactivos y concentrando en uno de ellos los compuestos con actividad antimicrobiana.  &nbsp

Supercritical Fluid fractionation of mentha suaveolens: concentration of functional properties

Supercritial Antisolvent Fractionation process was optimiced for the concentration of Mentha suaveolens bioactives in two different fractions. Their composition was analysed with HPLC. The antimicrobial activity of these fractions was assayed. The SAF process fractionated M. suaveolens tincture in two enriched fractions in different bioactives concentrating those with antimicrobial activity in one of them.  El proceso de Fraccionamiento Supercrítico Antidisolvente  fue optimizado para la concentrar bioactivos de Mentha suaveolens en dos diferentes fracciones. Su composición fue analizada con HPLC. La actividad antimicrobiana de estas fracciones fue ensayada. El proceso supercrítico permitió fraccionar la tintura de esta planta en 2 fracciones enrriqueciendolas en diferentes bioactivos y concentrando en uno de ellos los compuestos con actividad antimicrobiana.  &nbsp

Supercritical Extraction and Separation of Antioxidants from Residues of the Wine Industry

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Solubility of non-polar gases in anisol, at 283.15 to 303.15 °K

Solubility measurements of several non-polar gases (He, Ne, Ar, Kr, D2, CH4, CF4, and SF6) in anisol at 283.15 to 303.15 K and a partial pressure of gas of 1 atmosphere are reported. Gibbs free energy, enthalpy and entropy of solution at 298.15 K and 1 atm partial pressure of gas are evaluated. Using the scaled-particle theory, Lennard-Jones (6, 12) pair-potential parameters for anisol were also determined

Solubility of non-polar gases in 1,4-dioxane, at 285.15 to 303.15 K

Solubility measurements of several non-polar gases (He, Ne, Ar, Kr, Xe, H2, D2, N2, CH4, C2H4, C2H6, CF4, SF6 and CO2) in 1,4-dioxane, at 285.15 to 303.15 K and a partial pressure of gas of 101 kPa, are reported. Experimental results are compared with those obtained from Hildebrand’s semiempirical approach. The special behaviour of CO2 is made plain. Gibbs free energy, enthalpy and entropy of solution, at 298.15 K and 101 kPa partial pressure of gas, are evaluated. Besides, using the scaled-particle theory, Lennard-Jones (6, 12) pair potential parameters for 1,4-dloxane were also determined

Viscosity measurements on aniline, p-toludine and p-anisidine + phénol in the temperature range of 303.15-343.15 K

Densities and viscosities of the binary mixtures aniline, p-toluidine and p-aninisidine + phenol between 303.15 and 343.15 K, in the whole range of composition were determined. Experimental results for excess viscosities at 323.15, 333.15 and 343.15 were fitted to Grundberg and Nissan's equation. From the excess viscosity, the δ parameters of the Grundberg-Nissan equation and the activation energies is concluded that interaction between the anilines and phenol increases in the sequence aniline p-toluidine p-anisidine, which is in line with the basicity of the compounds. The basicity of the anilines can be explained in terms of both inductive and mesomeric effects