Granted Patent B2

US 12,276,067 · App. 17/187,354 · Granted Apr 15, 2025

Inventors: Clay Purdy (Medicine Hat, CA); Markus Weissenberger (Calgary, CA); Kyle G. Wynnyk (Calgary, CA); Karl W. Dawson (Calgary, CA)

Assignee: SIXRING INC.

D21C3/06C01B15/08D21C3/006

Abstract

Claims (36)

1. An aqueous acidic composition comprising:

an alkylsulfonic acid;

a peroxide; and

a compound comprising an amine moiety selected from an alkanolamine,

wherein said alkylsulfonic acid is present in the composition in an amount ranging from 20 to 65 wt % of the total weight of the composition;

wherein said peroxide is present in the composition in an amount ranging from 1 to 30 wt % of the total weight of the composition; and

wherein said alkylsulfonic acid and said peroxide are present in the composition in a molar ratio of no less than 1:1.

2. The composition according to claim 1 , wherein said alkylsulfonic acid is selected from alkylsulfonic acids, wherein the alkyl in said alkylsulfonic acids is a linear or branched C1-C6 alkyl, and combinations thereof.

3. The composition according to claim 1 , wherein said alkylsulfonic acid is selected from methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, 2-propanesulfonic acid, isobutylsulfonic acid, t-butylsulfonic acid, butanesulfonic acid, iso-pentylsulfonic acid, t-pentylsulfonic acid, pentanesulfonic acid, t-butylhexanesulfonic acid, and combinations thereof.

4. The composition according to claim 1 , wherein said alkylsulfonic acid is methanesulfonic acid.

5. An aqueous composition comprising:

alkylsulfonic acid;

a peroxide; and

a compound comprising an amine moiety selected from an alkanolamine,

wherein said alkylsulfonic acid is present in the composition in an amount ranging from 20 to 65 wt % of the total weight of the composition;

wherein said peroxide is present in the composition in an amount ranging from 1 to 30 wt % of the total weight of the composition; and

wherein said alkylsulfonic acid and said peroxide are present in the composition in a molar ratio ranging from 1:1 to 15:1,

wherein said composition is suitable for delignifying biomass or wood.

6. The composition according to claim 5 , wherein said peroxide is hydrogen peroxide.

7. A method of delignifying biomass or plant material, said method comprising:

providing said biomass or plant material comprising cellulose fibers and lignin; and

exposing said biomass or plant material to a composition comprising:

alkylsulfonic acid;

a peroxide; and

a compound comprising an amine moiety selected from an alkanolamine,

wherein said alkylsulfonic acid is present in the composition in an amount ranging from 20 to 65 wt % of the total weight of the composition;

wherein said peroxide is present in the composition in an amount ranging from 1 to 30 wt % of the total weight of the composition; and

wherein said alkylsulfonic acid and said peroxide are present in the composition in a molar ratio ranging from 1:1 to 15:1;

for a period of time sufficient to remove substantially all lignin present on said biomass or plant material.

8. The method according to claim 7 , wherein said compound comprising an amine moiety has a molecular weight of less than 300 g/mol.

9. The method according to claim 7 , wherein said alkanolamine is selected from monoethanolamine, diethanolamine, triethanolamine, and combinations thereof.

10. The method according to claim 7 , wherein said alkanolamine is triethanolamine.

11. The method according to claim 7 , wherein said peroxide is hydrogen peroxide.

12. The composition of claim 1 , wherein said peroxide is hydrogen peroxide.

13. The composition according to claim 1 , wherein said alkanolamine is selected from monoethanolamine, diethanolamine, triethanolamine, and combinations thereof.

14. The composition according to claim 1 , wherein said alkanolamine is triethanolamine.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (58)