Solvent process for recovering indigo dye from textile scrap

Details Solvent process for recovering indigo dye from textile scrap Solvent process for recovering indigo dye from textile scrap

1998-02-02

1999-11-23

Einsmann, Margaret

Bleaching and dyeing; fluid treatment and chemical modification

Dye recovery process, other than nominal recovery

8102, 8586, 8614, 8650, 8653, 8918, C09B 6734, D09P 122, D09P 358

Patent

active

059892960

ABSTRACT:
A process for recovering a vat dye from a textile using a heated organic solvent. The textile is contacted with a heated organic solvent in which the dye is soluble until dye is extracted from the textile into the solvent to produce a dye-containing solvent solution. The dye is then recovered from the organic solvent by evaporation of the solvent leaving a dye residue, cooling and precipitation of the dye, or extraction of the dye by contacting the dye-containing solvent solution with an aqueous solution containing a reducing agent for the dye. When dye is extracted from the dye-containing solvent solution by contacting it with an aqueous solution containing a reducing agent, the dye is subsequently insolubilized by oxidation, and the dye is recovered from the aqueous dye solution. This process is particularly advantageous for recovering indigo dye from denim scrap.

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