US 11,982,051 B2
Temperature-controlled delignification of biomass
Markus Weissenberger, Calgary (CA); Emhemmed Youssef, Calgary (CA); and Markus Pagels, Calgary (CA)
Assigned to SixRing Inc., Calgary (CA)
Filed by SixRing Inc., Calgary (CA)
Filed on Jun. 16, 2022, as Appl. No. 17/807,179.
Claims priority of application No. 3122786 (CA), filed on Jun. 18, 2021.
Prior Publication US 2022/0412001 A1, Dec. 29, 2022
Int. Cl. D21C 3/00 (2006.01); D21C 3/04 (2006.01)
CPC D21C 3/003 (2013.01) [D21C 3/04 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process to perform a controlled exothermic delignification of biomass, said process comprising the steps of:
providing a vessel;
providing biomass comprising lignin, hemicellulose and cellulose fibers into said vessel;
providing a modified Caro's acid composition selected from the group consisting of: composition A and Composition C;
wherein said composition A comprises:
sulfuric acid in an amount ranging from 20 to 70 wt % of the total weight of the modified Caro's acid composition;
a compound comprising an amine moiety and a sulfonic acid moiety selected from the group consisting of: taurine; taurine derivatives; and taurine-related compounds; and
a peroxide,
wherein said sulfuric acid, said compound comprising an amine moiety and a sulfonic acid moiety, and said peroxide are present in a molar ratio of no less than 1:1:1 and no more than 15:1:1;
wherein said composition C comprises:
sulfuric acid;
a compound comprising an amine moiety;
a compound comprising a sulfonic acid moiety; and
a peroxide,
wherein said sulfuric acid and said a compound comprising an amine moiety, and said compound comprising a sulfonic acid moiety are present in a molar ratio of no less than 1:1:1 and no more than 28:1:1;
exposing said biomass to said modified Caro's acid composition, creating a reaction mass;
allowing said modified Caro's acid composition to come into contact with said biomass for a period of time sufficient to a delignification reaction to occur and remove over 90 wt % of said lignin and hemicellulose from said biomass; and
controlling the temperature of the delignification reaction to maintain it below 55° C. by a method selected from the group consisting of:
adding water into said vessel;
adding biomass into said vessel; and
using a heat exchanger.