	US 11,668,047 B2
	Use of a 2 liquid phase system in 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. 17/405,027.
Claims priority of application No. CA 3102538 (CA), filed on Dec. 11, 2020.
Prior Publication US 2022/0186435 A1, Jun. 16, 2022
Int. Cl. D21C 3/04 (2006.01)

CPC D21C 3/04 (2013.01)

20 Claims

1. A method for controlled delignification of lignocellulosic feedstock, said method comprising the steps of:

providing a reactive phase of pH less than 1, said reactive phase comprising:

water;

sulfuric acid;

a source of peroxide;

a modifying agent, said modifying agent adapted to control the reactivity of the sulfuric acid;

providing a holding phase, said holding phase comprising an organic solvent which does not react with the aqueous acidic composition;

combining said reactive phase and holding phase to form a reaction mixture;

exposing a lignocellulosic material to said reaction mixture for a period of time sufficient to allow delignification of the lignocellulosic material.