METHOD FOR DECOLORIZATION OF A DYED POLYESTER FIBER
First Claim
1. A method for decolorization of a dyed polyester fiber, comprising the steps of:
- (a) separately providing a dyed polyester fiber stained with a dye, and a solvent that is capable of dissolving the dye;
(b) heating the solvent to produce a fresh vapor of the solvent, the temperature of the fresh vapor ranging between the glass transition temperature and the melting point temperature of the polyester fiber;
(c) condensing the fresh vapor to form a condensed fluid of the solvent;
(d) contacting the dyed polyester fiber with the condensed fluid of the solvent that has a temperature sufficient to dissolve the dye such that the dye is extracted from the dyed polyester fiber so as to form a dye-containing solution and a decolorized polyester fiber; and
(e) separating the dye-containing solution from the decolorized polyester fiber.
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Accused Products
Abstract
A method for decolorization of a dyed polyester fiber includes: separately providing a dyed polyester fiber stained with a dye, and a solvent capable of dissolving the dye; heating the solvent to produce a fresh vapor of the solvent, the temperature of the fresh vapor ranging between the glass transition temperature and the melting point of the polyester fiber; condensing the fresh vapor to form a condensed fluid of the solvent; contacting the dyed polyester fiber with the condensed fluid of the solvent that has a temperature sufficient to dissolve the dye such that the dye is extracted from the dyed polyester fiber so as to form a dye-containing solution and a decolorized polyester fiber; and separating the dye-containing solution from the decolorized polyester fiber.
5 Citations
12 Claims
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1. A method for decolorization of a dyed polyester fiber, comprising the steps of:
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(a) separately providing a dyed polyester fiber stained with a dye, and a solvent that is capable of dissolving the dye; (b) heating the solvent to produce a fresh vapor of the solvent, the temperature of the fresh vapor ranging between the glass transition temperature and the melting point temperature of the polyester fiber; (c) condensing the fresh vapor to form a condensed fluid of the solvent; (d) contacting the dyed polyester fiber with the condensed fluid of the solvent that has a temperature sufficient to dissolve the dye such that the dye is extracted from the dyed polyester fiber so as to form a dye-containing solution and a decolorized polyester fiber; and (e) separating the dye-containing solution from the decolorized polyester fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification