	US 12,275,697 B2
	Method of depolymerising phenolic polymers
Ndumiso Sibanda, Stellenbosch (ZA); Harold Pasch, Stellenbosch (ZA); and Helen Pfukwa, Stellenbosch (ZA)
Assigned to Stellenbosch University, Stellenbosch (ZA)
Appl. No. 17/605,769
Filed by Stellenbosch University, Stellenbosch (ZA)
PCT Filed Apr. 23, 2020, PCT No. PCT/IB2020/053859 § 371(c)(1), (2) Date Oct. 22, 2021, PCT Pub. No. WO2020/217209, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019/02602 (ZA), filed on Apr. 25, 2019.
Prior Publication US 2022/0227694 A1, Jul. 21, 2022
Int. Cl. C07C 45/59 (2006.01); C07C 27/00 (2006.01); C07C 37/54 (2006.01); C07C 41/01 (2006.01); C07C 45/67 (2006.01); C07G 1/00 (2011.01); C08J 11/28 (2006.01); C08L 97/00 (2006.01); C10G 1/00 (2006.01)

CPC C07C 45/673 (2013.01) [C07C 27/00 (2013.01); C07C 37/54 (2013.01); C07C 41/01 (2013.01); C07C 45/59 (2013.01); C07G 1/00 (2013.01); C08J 11/28 (2013.01); C08L 97/005 (2013.01); C08J 2397/00 (2013.01); Y02W 30/62 (2015.05)]

20 Claims

1. A method for depolymerising a phenolic polymer, the method comprising reacting the phenolic polymer with dimethylsulphoxide and a hydrogen halide, wherein the product of the reaction comprises at least one compound selected from monomeric and oligomeric forms of vanillin, syringaldehyde, benzaldehyde, p-hydroxybenzaldehyde, eugenol, phenol, phloroglucinol, and 2,4-dihydroxybenzaldehyde.