Process to recover NaOH, polyester monomers, dyes and byproducts from an alkaline depolymerization liquor resulting from a depolymerization reaction of polyester in a blend textile. The process comprises concentrating the liquor solution in a mixture comprising water, solid NaOH, dyes and other liquid products, extracting ethylene glycol from the mixture, dissolving solid NaOH, recovering solid dyes and recovering terephthalic acid.

Described is a method for decoloring of a textile material, the method includes the steps of: providing a textile material; providing an alkaline solution containing one or more anionic polyelectrolytes; treating the textile material in the alkaline solution during a treatment period; and recovering at least some of the textile material from the alkaline solution.

A method for decolorizing polyester fabric and a polyester fabric are provided. The method for decolorizing polyester fabric includes providing a dye-attached polyester fabric. The dye-attached polyester fabric is immersed in a first solution, obtaining a treated polyester fabric. The treated polyester fabric is immersed in a second solution, to obtain a decolorized polyester fabric. The first solution includes water, a first swelling agent and a solubility promoter. The second solution includes water, a second swelling agent, and an auxiliary swelling agent.

In a process for removing dyes from a waste textile material, including at least 50% by weight of polyester fibers, a batch of said textile material in an extraction chamber is extracted with a solvent that is circulated through the textile and the extraction chamber; said solution comprising solvent and extracted material is used as a solvent to extract dye from another batch of textile material, and in that said steps of extraction are repeated, until the amount of extracted material in said solution comprising solvent and extracted material reach a concentration whereby further dye extraction is impaired.

The present disclosure relates to a method that includes a first contacting of a starting solid composition that includes a starting solid phase and a dye with a removal fluid resulting in a first mixture that includes the starting solid phase, the dye, and the removal fluid, where the removal fluid includes at least one of a cyclic compound, a glycol, an alcohol, and/or an acid.