	US 12,071,724 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. 17/405,029.
Claims priority of application No. 3102944 (CA), filed on Dec. 18, 2020.
Prior Publication US 2022/0195665 A1, Jun. 23, 2022
Int. Cl. D21C 3/04 (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)]

10 Claims

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

providing a vessel;

providing said lignocellulosic feedstock;

providing a composition comprising;

an acid;

a modifying agent selected from the group consisting of: imidazole; N-alkylimidazole; taurine; a taurine derivative; a taurine-related compound; an alkylsulfonic acid; an arylsulfonic acid; triethanolamine; and combinations thereof;

a metal salt; and

a peroxide;

exposing said lignocellulosic feedstock to said composition in said vessel for a period of time sufficient to remove at least 80% of the lignin present in said lignocellulosic feedstock;

optionally, removing a liquid phase comprising dissolved lignin fragments from a solid phase comprising cellulose fibres.