	US 11,905,656 B2
	Approach to biomass delignification
Clay Purdy, Medicine Hat (CA); Markus Weissenberger, Calgary (CA); Markus Pagels, Calgary (CA); Kyle G Wynnyk, Calgary (CA); Matthew Dewit, Calgary (CA); and Andrew M Corbett, Calgary (CA)
Assigned to SixRing Inc., Calgary (CA)
Filed by SixRing Inc., Calgary (CA)
Filed on Aug. 18, 2021, as Appl. No. 17/405,028.
Claims priority of application No. CA 3102925 (CA), filed on Dec. 18, 2020.
Prior Publication US 2022/0195664 A1, Jun. 23, 2022
Int. Cl. D21C 3/04 (2006.01); D21C 9/16 (2006.01); D21C 3/00 (2006.01); C01B 15/04 (2006.01); C09K 3/00 (2006.01)

CPC D21C 3/04 (2013.01) [C01B 15/04 (2013.01); C09K 3/00 (2013.01); D21C 3/003 (2013.01); D21C 9/163 (2013.01)]

7 Claims

1. A process to separate lignin from a lignocellulosic feedstock, said process comprising the steps of:

providing said lignocellulosic feedstock;

providing a vessel;

providing a composition comprising;

an acid;

a modifying agent selected from the group consisting of: sulfamic acid; imidazole; imidazole derivatives; taurine; a taurine derivative; a taurine-related compound; alkylsulfonic acid; arylsulfonic acid; triethanolamine; and

combinations thereof;

a peroxide salt; and

a peroxide;

exposing said lignocellulosic feedstock to said composition in said vessel for a period of time sufficient to depolymerize substantially all of the lignin present in said lignocellulosic feedstock into lignin oligomers and lignin monomers;

wherein said process is carried out at atmospheric pressure.