US 12,247,348 B2
Method for decoloring of a textile material
Jim Parkås, Varberg (SE); Anna Palme, Kållered (SE); and Harald Brelid, Gothenburg (SE)
Assigned to SÖDRA SKOGSÄGARNA EKONOMISK FÖRENING, Växjö (SE)
Appl. No. 18/548,590
Filed by SÖDRA SKOGSÄGARNA EKONOMISK FÖRENING, Växjö (SE)
PCT Filed Feb. 28, 2022, PCT No. PCT/SE2022/050204
§ 371(c)(1), (2) Date Sep. 1, 2023,
PCT Pub. No. WO2022/186754, PCT Pub. Date Sep. 9, 2022.
Claims priority of application No. 2150245-5 (SE), filed on Mar. 4, 2021.
Prior Publication US 2024/0044069 A1, Feb. 8, 2024
Int. Cl. D06L 4/00 (2017.01); D06P 5/13 (2006.01)
CPC D06L 4/00 (2017.01) [D06P 5/131 (2013.01)] 15 Claims
 
1. A method for recycling and decoloring of a textile material, the method comprising the steps of:
providing a textile material comprising polyester fibers and cellulosic fibers, at least a portion of the textile material being colored;
providing an alkaline solution containing one or more anionic polyelectrolytes selected from the group consisting of: carboxymethyl cellulose (CMC), a carboxyalkyl ether of cellulose, a carboxyalkyl ether of starch, a carboxyalkyl ether of amylose, a carboxyalkyl ether of amylopectin and a carboxyalkyl ether of a natural gum, or a combination thereof;
treating the textile material in the alkaline solution during a treatment period of at least 10 minutes at a temperature in the range of from 100° C. to 180° C.;
separating the cellulosic fibers from the textile material; and
recovering the cellulosic fibers from the alkaline solution after the treatment period,
wherein the method comprises a step of mechanically disintegrating the textile material before treating it in the alkaline solution.