US 11,655,350 B2
Solvent based approach to post-consumer recycling of polyethylene terephthalate
Erin Broderick, Arlington Heights, IL (US); Rodrigo Lobo, Des Plaines, IL (US); Francis Lupton, Evanston, IL (US); Shurong Yang, Des Plaines, IL (US); Raymond Shih, Elgin, IL (US); Andrea Bozzano, Northbrook, IL (US); and Hayim Abrevaya, Kenilworth, IL (US)
Assigned to UOP LLC, Des Plaines, IL (US)
Filed by UOP LLC, Des Plaines, IL (US)
Filed on Apr. 16, 2021, as Appl. No. 17/232,840.
Prior Publication US 2022/0332914 A1, Oct. 20, 2022
Int. Cl. B29B 9/04 (2006.01); C08J 11/08 (2006.01)
CPC C08J 11/08 (2013.01) [C08J 2367/02 (2013.01); C08J 2423/02 (2013.01)] 20 Claims
 
1. A process of treating a feed comprising polyethylene terephthalate, said process comprising dissolving said feed in a polar solvent at a temperature between about 100 to 250° C. to produce a dissolved feed; then cooling the dissolved feed to precipitate a solid comprising precipitation of purified polyethylene terephthalate and further separating solid purified polyethylene terephthalate from remaining liquids, wherein said polar solvent is selected from N-methylpyrrolidone, dimethylsulfoxide, dihydrolevoglucosenone, gamma-valerolactone, dimethyl isosorbide, N-methylcaprolactam, eucalyptol and mixtures thereof.