Solubility of Disperse and Mordant Dyes in Supercritical CO₂

Abstract

Waterless dyeing is the new approach in textile dyeing in order to reduce or eliminate effluent waste, and supercritical carbon dioxide is an alternative solvent being considered. The research focus has therefore been on determination of dyestuff solubilities in supercritical carbon dioxide. We have determined the solubilities of two disperse dyes (C. I. Disperse Yellow 7, C. I. Disperse Oranges 11) and three mordant dyes (C. I. Mordant Brown, C. I. Mordant Yellow 12, and C. I. Mordant Red 11) at 323-343 K and pressures in the range 132-195 bar. Mordant Brown had the highest solubility in the range (1.2-5.1) × 10 -4 mole fraction whereas Mordant Yellow 12 had the lowest solubility in the range (1.7-5.1) × 10 -7 mole fraction. The disperse dyes and Mordant Red had solubilities of the order 10 -6 mole fraction.

Robust modelling of solubility in supercritical carbon dioxide using Bayesian methods

“…It is likely that the hydrogen-bond donor descriptor was selected as the solutes may interact with one another or with carbon dioxide molecules. This formation of the inter-or intra-molecular hydrogen bonds was proposed by other studies, to influence the supercritical solubility [8,9,19,[27][28][29].…”

Wavelet neural network modeling in QSPR for prediction of solubility of 25 anthraquinone dyes at different temperatures and pressures in supercritical carbon dioxide

“…The anthraquinone and azo dyes have been used more than others in the SFD process. The solubility measurements of the anthraquinone dyes in supercritical carbon dioxide have been reported in terms of mole fraction of solute in solution in several papers [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. These experimental data are correlated by theoretical or semi-empirical models [23][24][25][26][27][28][29][30][31][32].…”

Representing dyestuff solubility in supercritical carbon dioxide with several density-based correlations

“…To use supercritical dyeing in the textile process, it is imperative to in detail investigate a wide variety of disperse dyes in supercritical CO 2 over wide ranges of temperatures and pressures. To date, there are rather a number of studies on dyestuff solubility behavior [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. A briefing of dyestuff solubility in supercritical CO 2 has been kindly updated by Lin et al [18,24].…”