US 12,473,420 B2
Method for processing waste fabric containing polyester and wool fibers
Te-Chao Liao, Taipei (TW); Jung-Jen Chuang, Taipei (TW); and Chung-Chi Su, Taipei (TW)
Assigned to NAN YA PLASTICS CORPORATION, Taipei (TW)
Filed by NAN YA PLASTICS CORPORATION, Taipei (TW)
Filed on Jul. 29, 2022, as Appl. No. 17/877,827.
Claims priority of application No. 110139422 (TW), filed on Oct. 25, 2021.
Prior Publication US 2023/0132013 A1, Apr. 27, 2023
Int. Cl. C08J 11/26 (2006.01); D01G 11/00 (2006.01)
CPC C08J 11/26 (2013.01) [D01G 11/00 (2013.01); C08J 2367/00 (2013.01); D10B 2211/02 (2013.01); D10B 2331/04 (2013.01); Y02W 30/62 (2015.05)] 8 Claims
OG exemplary drawing
 
1. A method for processing a waste fabric containing polyester and wool fibers, comprising:
providing a waste fabric containing polyester and wool fibers and fragmentizing the waste fabric into a plurality of fabric scraps;
treating the waste fabric with an acid catalyst aqueous solution, wherein the acid catalyst aqueous solution is applied in a circulation and backflow manner to repeatedly contact the fabric scraps and carry out a hydrothermal reaction at 160° C. to 170° C. for 1 hour to 5 hours, such that the wool fibers are degraded and separated from the polyester fibers, and wherein a contact frequency of the acid catalyst aqueous solution with the fabric scraps is 3 to 5 times per minute; and
recycling the treated waste fabric.