US 12,006,403 B2
Methods for recycling cotton and polyester fibers from waste textiles
Florin G. Barla, Danville, VA (US); Todd Showalter, Danville, VA (US); Hsun-Cheng Su, Chapel Hill, NC (US); Jeremy Jones, Danville, VA (US); and Iulian Bobe, Danville, VA (US)
Assigned to Circ, LLC, Danville, VA (US)
Filed by Circ, LLC, Danville, VA (US)
Filed on Jun. 27, 2022, as Appl. No. 17/850,030.
Application 17/850,030 is a continuation of application No. 17/019,877, filed on Sep. 14, 2020, granted, now 11,370,895.
Application 17/019,877 is a continuation of application No. 16/695,969, filed on Nov. 26, 2019, granted, now 11,180,629, issued on Nov. 23, 2021.
Application 16/695,969 is a continuation of application No. 16/246,044, filed on Jan. 11, 2019, granted, now 10,501,599, issued on Dec. 10, 2019.
Claims priority of provisional application 62/616,543, filed on Jan. 12, 2018.
Prior Publication US 2022/0348736 A1, Nov. 3, 2022
Int. Cl. C08J 11/26 (2006.01); C07C 51/09 (2006.01); C07C 63/26 (2006.01); C08B 16/00 (2006.01); C08J 11/14 (2006.01); C08L 1/02 (2006.01); D06M 13/184 (2006.01)
CPC C08J 11/26 (2013.01) [C07C 51/09 (2013.01); C07C 63/26 (2013.01); C08B 16/00 (2013.01); C08J 11/14 (2013.01); C08L 1/02 (2013.01); D06M 13/184 (2013.01); C08J 2367/02 (2013.01); C08J 2401/02 (2013.01)] 20 Claims
 
1. A method of producing one or both of cellulose and terephthalic acid (TPA) from a waste textile material comprising a cotton/polyester blend material, the method comprising:
treating the waste textile material in a subcritical water reactor, wherein one or both of a cellulose that comprises a degree of polymerization ranging from about 150-2500 and a dissolved TPA and ethylene glycol (EG) is produced.