Solubilities of disperse dyes of blue 79:1, red 82 and modified yellow 119 in supercritical carbon dioxide and nitrous oxide

Dissolution of disperse blue 79: 1, red 82, and modified yellow 119 with supercritical carbon dioxide and nitrous oxide was studied at 393.2 K and 30 MPa over a wide range of contact times. Equilibrium solubilities of the dyestuffs in the supercritical fluids were also measured at temperatures from 353.2 to 393.2K and pressures up to 30MPa. The solubilities were enhanced generally about 100-fold as pressure increasing from 15 to 30 MPa. Under the same equilibrium condition, the solubilities of the dyes in carbon dioxide followed the order of red 82 > blue 79:1 > modified yellow 119, and modified yellow 119 is more soluble in nitrous oxide than in carbon dioxide. The solubility data were correlated with the Chrastil, the Sung-Shim, and the Mendez-Santiago-Teja models. The Chrastil model correlated the solubility data to about within the experimental uncertainty. The correlated results of the Mendez-Santiago-Teja model endorsed the consistency of the solubility data over the entire experimental conditions. (C) 2004 Elsevier B.V. All rights reserved.