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METHOD FOR DECOLORIZATION OF A DYED POLYESTER FIBER

  • US 20150059103A1
  • Filed: 03/26/2014
  • Published: 03/05/2015
  • Est. Priority Date: 09/04/2013
  • Status: Abandoned Application
First Claim
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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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