A method and an integrated system for dyeing synthetic, natural, and blended textiles in the form of fabrics, yarns, and garments are provided. The integrated system includes a first pressurizing pump for pressurizing liquefied CO.sub.2 to supercritical CO.sub.2 (Sc—CO.sub.2); a second pressurizing pump for pressurizing CO.sub.2 to liquefied CO.sub.2; a liquefied CO.sub.2 storage vessel for storing the liquefied CO.sub.2 and the separated liquefied CO.sub.2 from the one or more cyclone separators; a heater for heating the Sc—CO.sub.2; a dyestuff vessel for mixing a dyestuff and the Sc—CO.sub.2 to obtain Sc—CO.sub.2-mixed dyestuff; a dyeing vessel for dyeing the textile by circulating the Sc—CO.sub.2 and the Sc—CO.sub.2-mixed dyestuff between the dyeing vessel and the dyestuff vessel; and one or more cyclone separators for removing the dyestuff from the Sc—CO.sub.2-mixed dyestuff to obtain separated liquefied CO.sub.2.

A method and an integrated system for dyeing synthetic, natural, and blended textiles in the form of fabrics, yarns, and garments are provided. The integrated system includes a first pressurizing pump for pressurizing liquefied CO.sub.2 to supercritical CO.sub.2 (Sc—CO.sub.2); a second pressurizing pump for pressurizing CO.sub.2 to liquefied CO.sub.2; a liquefied CO.sub.2 storage vessel for storing the liquefied CO.sub.2 and the separated liquefied CO.sub.2 from the one or more cyclone separators; a heater for heating the Sc—CO.sub.2; a dyestuff vessel for mixing a dyestuff and the Sc—CO.sub.2 to obtain Sc—CO.sub.2-mixed dyestuff; a dyeing vessel for dyeing the textile by circulating the Sc—CO.sub.2 and the Sc—CO.sub.2-mixed dyestuff between the dyeing vessel and the dyestuff vessel; and one or more cyclone separators for removing the dyestuff from the Sc—CO.sub.2-mixed dyestuff to obtain separated liquefied CO.sub.2.

An embodiment herein provides a process for dyeing of textile materials 108 with supercritical fluid. One or more dye materials 102 along with additives (if required) are mixed with at least one suitable solvent 104 to obtain one or more dye solutions 106. A textile material 108 is pre-treated with the one or more dye solutions 106 to obtain a dye coated textile material 110. The dye-coated textile material 110 is exposed to the supercritical fluid 112 in a supercritical fluid dyeing vessel at controlled pressure and temperature. The supercritical fluid 112 solubilizes and diffuses the one or more dye materials 102 inside the surface, pores and capillaries of the textile material 108. The supercritical fluid vessel is then depressurized below supercritical condition to entrap the one or more dye materials 102 in the textile material 108 to obtain a supercritical fluid dyed textile material 114.

The present invention provides a rapid and highly efficient process for treating textile threads, especially dyeing, and treated threads obtained thereby of textile threads.

The present invention provides a rapid and highly efficient process for treating textile threads, especially dyeing, and treated threads obtained thereby of textile threads.

A method for processing textile fibers is provided. The method comprises: adding a plurality of raw materials for processing textile fibers into a plurality of kettles; preparing supercritical carbon dioxide; obtaining one or more natural plant dyes and one or more natural plant extracts from the plurality of raw materials, and dissolving the one or more natural plant dyes and the one or more natural plant extracts in the supercritical carbon dioxide; dyeing and functionally modifying the textile fibers simultaneously by using the supercritical carbon dioxide carrying a mixture of the one or more natural plant dyes and the one or more natural plant extracts; performing a post-process to recycle the supercritical carbon dioxide; and performing a cleaning process to clean the one or more natural plant dyes and one or more natural plant extracts.

A method for processing textile fibers is provided. The method comprises: adding a plurality of raw materials for processing textile fibers into a plurality of kettles; preparing supercritical carbon dioxide; obtaining one or more natural plant dyes and one or more natural plant extracts from the plurality of raw materials, and dissolving the one or more natural plant dyes and the one or more natural plant extracts in the supercritical carbon dioxide; dyeing and functionally modifying the textile fibers simultaneously by using the supercritical carbon dioxide carrying a mixture of the one or more natural plant dyes and the one or more natural plant extracts; performing a post-process to recycle the supercritical carbon dioxide; and performing a cleaning process to clean the one or more natural plant dyes and one or more natural plant extracts.

A method for decolorization of a dyed polyester fiber is provided. The method for decolorization of a dyed polyester fiber includes step of: providing an ether-alcohol solvent and a polyester fiber containing a dye; heating the ether-alcohol solvent up to a boiling point of the ether-alcohol solvent to continuingly generate a fresh gas; wherein a temperature of the fresh gas ranges from 90 C. to 200 C. which is between a glass transition temperature of the polyester fiber and a melting point of the polyester fiber; extracting the dye from the polyester fiber via the fresh gas and forming an extracting condensate containing the dye; reflowing the extracting condensate back into the ether-alcohol solvent; repeating the steps mentioned above to obtain a decolorized polyester fiber.

A method for decolorization of a dyed polyester fiber is provided. The method for decolorization of a dyed polyester fiber includes step of: providing an ether-alcohol solvent and a polyester fiber containing a dye; heating the ether-alcohol solvent up to a boiling point of the ether-alcohol solvent to continuingly generate a fresh gas; wherein a temperature of the fresh gas ranges from 90 C. to 200 C. which is between a glass transition temperature of the polyester fiber and a melting point of the polyester fiber; extracting the dye from the polyester fiber via the fresh gas and forming an extracting condensate containing the dye; reflowing the extracting condensate back into the ether-alcohol solvent; repeating the steps mentioned above to obtain a decolorized polyester fiber.

The present invention discloses a multifunctional dyeing and finishing kettle and a production-type supercritical CO.sub.2 fluid anhydrous dyeing and finishing apparatus with a scale over 1000 liters. The production-type supercritical CO.sub.2 fluid anhydrous dyeing and finishing apparatus mainly comprises a CO.sub.2 low-temperature storage tank, a CO.sub.2 supply storage tank, a low-temperature transfer pump, an ethylene glycol head tank, an ethylene glycol pump, a water cooling tower, a water pump, a refrigeration unit, a condenser, a heat exchanger, a heat transfer oil system, a heat transfer oil replenishment system, a precooler, a CO.sub.2 boost pump, a dye kettle, a feeder, a multifunctional dyeing and finishing kettle, a CO.sub.2 circulation pump, a cooler, a separation kettle, an adsorber and a recovery compressor, an on-line monitoring system and an automatic control system. The apparatus is capable of meeting single-color or multi-color dyeing and finishing production of a plurality of textiles.