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DYE SOLUBILITY IN SUPERCRITICAL CARBON DIOXIDE. EFFECT OF HYDROGEN BONDING WITH COSOLVENTS

Korean Journal of Chemical Engineering, January 1999, 16(1), 111-117(7), 10.1007/BF02699013
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Abstract

The use of supercritical carbon dioxide is emerging as a potential method for achieving pollution-free dyeing. An important factor in supercritical fluid dyeing is the solubility of the dye in supercritical carbon dioxide. Our measurements show that the solubility of C.I. Disperse Red-60 dye in supercritical carbon dioxide is significantly enhanced upon addition of polar cosolvents : ethanol and acetone. The solubility enhancement is attributed to the formation of hydrogen bonds between cosolvent and dye molecules. Observed solubility behavior is correlated using dilute-solution theory with lattice-fluid-hydrogen-bonding model. Needed physical and hydrogen-bonding molecular parameters are estimated using the experimental data.

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