Method for decolorizing textiles
AssigneeThe Hong Kong Research Institute of Textiles and Apparel Limited
InventorsEdwin Yee Man Keh, Lei Yao, Hok Chung Chan, Sai Lung Fung, Un Teng Lam, Lap Hung Chan, Lee Ying Yu
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Abstract
A method for decolorizing a dyed textile comprising a synthetic fiber and a disperse dye, the method includes contacting the dyed textile with a super critical fluid thereby extracting at least a portion of the disperse dye from the textile into the super critical fluid and forming an at least partially decolorized textile.
Claims5
A method for decolorizing a dyed textile comprising polyethylene terephthalate (PET) and a disperse dye, the method consisting of contacting the dyed textile with a super critical fluid consisting of carbon dioxide at a pressure between 210 and 280 bar and a temperature of between 90 and 130° C. thereby extracting at least a portion of the disperse dye from the textile into the super critical fluid and forming an at least partially decolorized textile, wherein the super critical CO2 and the textile are present in a mass ratio between 4,500:1 to 9,000:1 and the tensile strength of the at least partially decolorized textile changes by no more than 10% of the tensile strength of the dyed textile.
Dependencies are inferred from the claim text.