Ionic Liquids Can Significantly Improve Textile Dyeing: An Innovative Application Assuring Economic and Environmental Benefits

Abstract

Owing to economic reasons, the textile dyeing industry generally employs traditional and absolutely no-eco-friendly processes: very large quantities of water are indeed required together with a large number of added chemicals which represent dramatic environmental issues. In order to improve the sustainability of the process, we have investigated the dyeing of wool, polyester, and cotton with disperse Red 13 using ionic liquids as the sole additive. The results obtained in isothermal dyeing at 95°C show an outstanding effect of the ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium chloride. This ionic liquid assures efficient dyeing of polyester and wool in open vessels, in the absence of whichever auxiliary agent with total dyebath exhaustion, thus allowing in principle the recycling of the dye bath! The environmental benefits arising from the substitution of a number of usually employed auxiliary agents with only an ionic liquid are highlighted together with the economic ones. This article reports for the first time, to the best of our knowledge, dyeing processes for several kinds of fibers (cotton, wool, and polyester) employing exclusively three components: pure disperse dye, water, and an appropriate ionic liquid.

Experimental and theoretical studies on solvation in aqueous solutions of ionic liquids carrying different side chains: the n-butyl-group versus the methoxyethyl group

“…The effect of decreasing viscosity on reactivity was nicely demonstrated by the observed increase in the rates of Diels-Alder reactions as a result of decreasing the viscosity of the medium, both for pure ILs and their aqueous solutions. 23,24 The use of aqueous ILs for pulp fractionation, ber spinning, 25 and as additives for improving dying of natural and synthetic bers 26 are interesting examples of the potential applications of green chemistry to improve these important industrial processes.…”

Microbial Biocompatibility and Biodegradability of Choline-Amino Acid Based Ionic Liquids

“…ILs possesses a number of advantages over conventional solvents [6] and supercritical fluids [7]. Hence, ILs has been used in different aspects of chemical engineering [8][9][10][11], nanotechnology [12], biotechnology [1,[13][14][15][16] and in the pharmaceutical industry [17][18][19][20][21][22]. ILs is often characterized by their degree of biocompatibility and biodegradability, a measure which reveals the toxicity and environmental adaptability of ILs.…”

Consumo de água em meios de hospedagem brasileiros

“…Em busca de uma produção mais limpa, novos tecidos e fibras foram obtidos como fibras artificiais de Lyocell (Paulitz et al, 2017), a aplicação de líquido iônico em tingimento (Bianchini et al, 2015;Meksi e Moussa, 2017). Novos corantes foram obtidos de fontes renováveis (Shahid-ul-Islam e Sun, 2017), a imobilização de catalisador e desenvolvimento para a aplicação de enzimas para processamento têxtil (Chu et al, 2018; Madhu e Chakraborty, 2017), coloração mais limpa com corante reativo usando um processo pad-batch-steam (Shu et al, 2018), bem como a desinfecção de têxteis usando plasma de baixa temperatura (Szulc et al, 2018).…”