Diffusion of hydrocarbons diluted in supercritical carbon dioxide.

Mutual diffusion of six hydrocarbons (methane, ethane, isobutane, benzene, toluene or naphthalene) diluted in supercritical carbon dioxide ([Formula: see text]) is studied by molecular dynamics simulation near the Widom line, i.e., in the temperature range from 290 to 345 K along the isobar 9 MPa.

Diffusion of Quinine with Ethanol as a Co-Solvent in Supercritical CO.

This study aims at contributing to quinine extraction using supercritical CO and ethanol as a co-solvent. The diffusion coefficients of quinine in supercritical CO are measured using the Taylor dispersion technique when quinine is pre-dissolved in ethanol. First, the diffusion coefficients of pure ethanol in the supercritical state of CO were investigated in order to get a basis for seeing a relative change in the diffusion coefficient with the addition of quinine.