Equilibrium distribution of water in the two-phase system supercritical carbon dioxide–textile |
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| Authors: | M van der Kraan MV Fernandez Cid GF Woerlee WJT Veugelers CJ Peters GJ Witkamp |
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| Affiliation: | aLaboratory for Process Equipment, Delft University of Technology, Leeghwaterstraat 44, 2628 CA Delft, The Netherlands;bFeyeCon Development & Implementation B.V., Rijnkade 17a, 1382 GS Weesp, The Netherlands;cPhysical Chemistry and Molecular Thermodynamics, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands |
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| Abstract: | When natural fibres are dyed in supercritical carbon dioxide, the addition of a small amount of water increases coloration. For a process design it is important to know how much water has to be added to obtain a desired humidity of both textile and carbon dioxide. In this work a thermodynamic model is proposed to calculate the distribution of water over the textile phase and the supercritical phase as a function of pressure and temperature. The phase equilibrium is described with Raoult's law for non-ideal fluids. The absorbed water in the textile is a condensed phase and is modelled here as a non-ideal liquid, using the NRTL-equation. The non-ideality of the supercritical phase is described by a solubility enhancement factor, a new equation derived from statistical thermodynamics. Although the model is applied to cotton, viscose, silk and wool, it can be used for all water absorbing textiles. |
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| Keywords: | Supercritical fluid Dyeing Carbon dioxide Water Textile Phase equilibria |
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