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Textile Research Journal
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Equilibrium Study on the Disperse Dyeing of Polyester Textile in Supercritical Carbon Dioxide

Martijn Van Der Kraan

Laboratory for Process Equipment, Delft University of Technology, Leeghwaterstraat 44, 2628 CA Delft, FeyeCon Development & Implementation B.V., Rijnkade 17a, 1382 GS Weesp, The Netherlands, m.vanderkraan{at}tudelft.nl

Maria Vanesa Fernandez Cid

Laboratory for Process Equipment, Delft University of Technology, Leeghwaterstraat 44, 2628 CA Delft, FeyeCon Development & Implementation B.V., Rijnkade 17a, 1382 GS Weesp, The Netherlands

Geert F. Woerlee

FeyeCon Development & Implementation B.V., Weesp, The Netherlands

Wim J. T. Veugelers

FeyeCon Development & Implementation B.V., Weesp, The Netherlands

Geert-Jan Witkamp

Laboratory for Process Equipment, Delft University of Technology, Delft, The Netherlands

The dyeing of polyester textile in supercritical carbon dioxide (scCO 2) was investigated experimentally. The influence of temperature and density of the scCO2 on the process was studied in the ranges 85—125°C and 400—550 kg/m3. The dye saturation concentration in the polyester increased and the distribution coefficient decreased with temperature, the latter showing a logarithmic dependence on the reciprocal of temperature. Increasing the fluid density led to an increasing saturation concentration and a decreasing distribution coefficient. When the right temperature and solvent density were chosen for the supercritical process, the same dye concentration could be attained as in aqueous dyeing. It was found that the adsorption of the dye on the polyester followed Nernst adsorption, as is the case in aqueous dyeing. The experiments showed that the dyeing was exothermic, with a negative change of entropy. The thermodynamic characteristics of supercritical and aqueous dyeing were concluded to be roughly the same, with similar saturation concentrations, thermodynamic affinities and heats and entropies of dyeing.

Key Words: polyester dyeing • supercritical carbon dioxide • adsorption isotherm • distribution coefficient

Textile Research Journal, Vol. 77, No. 8, 550-558 (2007)
DOI: 10.1177/0040517507077483
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