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Title: Representing dyestuff solubility in supercritical carbon dioxide with several density-based correlations
Authors: Huang, Z.
Guo, Y.-H.
Sun, G.-B.
Chiew, Y.C.
Kawi, S. 
Keywords: Chrastil model
Density-based correlations
Dye solubility
Supercritical fluids
Issue Date: 20-Sep-2005
Citation: Huang, Z., Guo, Y.-H., Sun, G.-B., Chiew, Y.C., Kawi, S. (2005-09-20). Representing dyestuff solubility in supercritical carbon dioxide with several density-based correlations. Fluid Phase Equilibria 236 (1-2) : 136-145. ScholarBank@NUS Repository.
Abstract: For the proper design of supercritical fluid dyeing process, it is essential to have a sound knowledge of the solubilities of dyes and the accurate solubility representation. In this work, we employed four semiempirical density-based models (the Chrastil model, the Bartle model, the K-J model and the M-T model) to correlate solubilities of 32 dyestuffs in supercritical carbon dioxide. The results show that these models perform very well with three temperature-independent parameters and could be applied for satisfactory solubility predictions. A comparison among the four models reveals that the ln y2 versus ln ρ Chrastil model gives much better correlations to the solubility data with an overall average absolute relative deviation (AARD) of 20.6% than the other three models. From the correlation results, the heat of dye-CO2 solvation and that of solute dye vaporization can be separately approximated in the range of 13.0-21.0 and 29.2-101.6 kJ/mol, respectively. Besides, the solubility discrepancies observed for certain dyestuffs have been discussed by using these density-based models. © 2005 Elsevier B.V. All rights reserved.
Source Title: Fluid Phase Equilibria
ISSN: 03783812
DOI: 10.1016/j.fluid.2005.07.012
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