Supercritical carbon dioxide as a green media in textile dyeing: A review

Abstract

This review highlights the great role of supercritical carbon dioxide fluid technology in textile dyeing processes. The unequivocal physical characteristics of supercritical carbon dioxide are presented and further researched to continue the development of high efficiency, compact dyeing to save energy and water in manufacturing processes. This review also focuses on the solubility of the dyes in scCO2 as well as the application of the technology to both synthetic and natural fabrics. Some factors relating to the economics of sustainable scCO2 technology are also outlined.

Novel sustainable synthesis of dyes for clean dyeing of wool and cotton fibres in supercritical carbon dioxide

“…In the previous work (Long et al, 2011;Long et al, 2012;Van der Kraan et al, 2007), water pre-treatment and water addition were shown to improve the dyeing results dramatically. The dyeing time and temperature had great impact on the dyeing qualities (Bach et al, 2002). Thus, in this study, the amount of water, dyeing time and temperature was quantified in order to establish the best dyeing conditions of the RD 1.…”

“…The dyeing conditions for dyeing both wool and cotton were much milder than those in the literature, indicating that there is a potential to try industrial scale experiments with this dyeing method (Abou Elmaaty and Abd El-Aziz, Bach et al, 2002;Banchero, 2013).…”

“…The success of dyeing synthetic fibres is mainly due to the plasticisation effect of scCO2 on polymers such as polyester (Lewin Kretzschmar and Harting), which is a phenomenon that improves the mobility of the polymer chains and increases the migration of semi-crystalline polymers. However, in the case of natural fibres which have a higher crystallinity and polarity than synthetic fibres, the inability of the nonpolar scCO2 to swell the polar natural fibres such as wool is a major obstacle in comparison to the dyeing of synthetic fibres (Bach et al, 2002). Additionally, amino and hydroxyl functions of solute molecules are known to reduce solubility in scCO2 (Draper et al, 2000).…”

Recent advances in supercritical fluid dyeing

“…SFD is not a novelty since its first experiments date back to the 1980s; comprehensive reviews can be found in the literature 8‐10 . This work is mainly focused on the recent advances of this technology from 2014 to the present.…”

Prediction of Acid Red 138 solubility in supercritical CO2 with water co-solvent

“…8,9 The application of supercritical carbon dioxide in the textile eld has also shown its advantage for replacing the environmentally unfriendly aqueous dyeing process because of the low energy consumption and zero waste water emission. [10][11][12][13][14] Former experiments veried that during supercritical carbon dioxide dyeing process, the addition of water always performs the improvement effects for natural bers dyeing. Firstly, a certain amount of water in supercritical carbon dioxide can alter the chemical nature (polarity and pH) of the uid, thus affecting the solubility and reactivity of dyes.…”