Abstract

D'ANGELO, J. V.H.  and  FRANCESCONI, A.Z.. Salt effect in the solubility of hydrogen in n-alcohols at pressures up to 10 MPa and temperatures up to 498.15 K. Braz. J. Chem. Eng. [online]. 2000, vol.17, n.4-7, pp.497-506. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322000000400014.

Gas-liquid solubility of hydrogen in methanol and ethanol systems with electrolytes was studied in the temperature range from 305.15 K to 498.15 K and pressures from 4 to 10 MPa. The experimental method used was the Total Pressure Method, which eliminates sampling and analysis of the phases, determining their composition at equilibrium using the following experimental data: moles of solute and solvent in the system; pressure, temperature and volume of the system at equilibrium; together with thermodynamic equations for fluid-phase equilibria. The salts used were lithium chloride and potassium acetate. The solubility of hydrogen increases with increasing temperature and pressure and the presence of salts causes a decrease in the solubility of hydrogen, when compared with the results of systems without salts, characterizing a "salting-out" effect, which is greater in conditions of lower temperature and pressure, specially for potassium acetate.

Keywords : Solubility; hydrogen; alcohols; electrolytes; high pressures.