	US 12,252,844 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. 17/405,026.
Claims priority of application No. CA 3100968 (CA), filed on Nov. 27, 2020.
Prior Publication US 2022/0170206 A1, Jun. 2, 2022
Int. Cl. D21C 3/04 (2006.01); D21C 3/00 (2006.01); D21C 9/16 (2006.01)

CPC D21C 3/04 (2013.01) [D21C 3/003 (2013.01); D21C 9/163 (2013.01)]

19 Claims

1. A delignification composition comprising:

a lignocellulosic material comprising lignin; and

an aqueous acidic composition comprising:

an acid;

a capping agent selected from the group consisting of methanol, ethanol, n-propanol, boric acid and combinations thereof; and

a peroxide;

wherein the acid and the peroxide are present in a molar ratio ranging from 1:1 to 10:1, and

wherein the capping agent is reactive with a fragment of the lignin.