Abstract
The authors measured the adsorption amounts of 2,6- and 2,7-DMN isomers dissolved in supercritical carbon dioxide (SC-CO2) on Y-type zeolite by a constant volume method. The total concentrations of 2,6- and 2,7-DMN in supercritical carbon dioxide were measured with an ultraviolet detector. The concentration ratio of 2,6- and 2,7- DMN in supercritical carbon dioxide was analyzed by gas chromatography. The separation coefficients of 2,6-DMN (2) and 2,7-DMN (3) are defined by K32=(Q3/C3)/(Q2/C2), where Q2 and Q3 are the amounts of 2,6- and 2,7-DMN adsorbed on Y-type zeolite and C2 and C3 are the concentrations of 2,6- and 2,7-DMN in supercritical carbon dioxide. The separation coefficients in supercritical carbon dioxide are much higher than those in liquid octane and ethanol. The experimental data were correlated by an extended Padke-Prausnitz equation. The correlated results are in agreement with the experimental data.
