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1. WO2020112702 - LIGNIN EXTRACTION WITH VOLATILE TRIALKYLAMINES

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

What is claimed is:

1 . A method of extracting lignin from a lignocellulosic biomass, the method comprising:

admixing a lignocellulosic biomass with an aqueous extraction solution comprising water and a trialkylamine under temperature and pressure sufficient to extract lignin from the lignocellulosic biomass, thereby providing a biomass extraction mixture comprising the water, the trialkylamine, and the lignin solubilized therein; and removing the trialkylamine from the biomass extraction mixture, thereby forming a solubilized lignin extract;

wherein the trialkylamine has a structure of formula (I) and is present in the aqueous extraction solution in an amount ranging from about 20 wt% to about 80 wt%, based on the total weight of the aqueous extraction solution:


wherein each of R1, R2, and R3 is independently Ci-6 alkyl.

2. The method of claim 1 , wherein removing the trialkylamine from the biomass extraction mixture comprises performing one or more of solvent evaporation and distillation.

3. The method of claim 1 or 2, wherein each of R1, R2, and R3 is independently methyl, ethyl, propyl, or isopropyl.

4. The method of any one of the preceding claims, wherein the trialkylamine is selected from the group consisting of trimethylamine, triethylamine, dimethylethylamine, tripropylamine, and combinations thereof.

5. The method of any one of the preceding claims, wherein the water is present in the aqueous extraction solution in an amount ranging from about 20 wt% to about 99 wt%, based on the total weight of the aqueous extraction solution.

6. The method of any one of the preceding claims, wherein the aqueous extraction solution comprises the trialkylamine and the water in a total amount of at least about 75 wt%, based on the total weight of the aqueous extraction solution.

7. The method of any one of the preceding claims, comprising performing the admixing at a temperature in a range from about 100 °C to about 200 °C.

8. The method of any one of the preceding claims, comprising performing the admixing in a pressurized vessel.

9. The method of any one of the preceding claims, comprising performing the admixing for up to about 20 hours.

10. The method of any one of the preceding claims, wherein the lignin is present in the lignin extract in an amount ranging from about 20 wt% to about 60 wt%, based on the total weight of the lignin extract.

1 1. The method of any one of the preceding claims, wherein the lignin extract is substantially free of the trialkylamine.

12. The method of any one of the preceding claims, wherein the lignin extract comprises at least about 50% of the lignin initially present in the lignocellulosic biomass.

13. The method of any one of the preceding claims, further comprising rinsing the lignin extract with ammonium hydroxide.

14. The method of any one of the preceding claims, wherein the aqueous extraction solution is substantially free of additional organic solvents other than one or more trialkylamines.

15. The method of any one of the preceding claims, wherein:

the biomass extraction mixture comprises acetic acid; and

the method further comprises recovering and optionally further processing the acetic acid.

16. The method of any one of the preceding claims, wherein the aqueous extraction solution is substantially free of ammonia.

17. The method of any one of the preceding claims, wherein the aqueous extraction solution is substantially free of a sulfur component.

18. The method of any one of the preceding claims, wherein the biomass extraction mixture is substantially free of additional organic solvents.

19. The method of any one of the preceding claims, wherein the biomass extraction mixture is substantially free of ammonia.

20. The method of any one of the preceding claims, wherein the biomass extraction mixture is substantially free of a sulfur component.

21. The method of any one of the preceding claims, wherein the lignocellulosic biomass is a wood-based biomass.

22. The method of any one of the preceding claims, wherein the lignocellulosic biomass comprises poplar.

23. The method of any one of the preceding claims, further comprising admixing a second lignocellulosic biomass with a second aqueous extraction solution comprising water and the removed trialkylamine under temperature and pressure sufficient to extract lignin from the second lignocellulosic biomass, thereby providing a second biomass extraction mixture comprising the water, the removed trialkylamine, and the lignin.

24. The method of any one of the preceding claims, further comprising:

separating extracted lignocellulosic biomass from the biomass extraction mixture.

25. The method of any one of the preceding claims, comprising performing the method

batchwise or continuously.

26. The method of any one of the preceding claims, further comprising:

themolyzing the lignin extract to provide a carbon material.

27. A method of extracting lignin from a lignocellulosic biomass, the method comprising:

admixing a lignocellulosic biomass with an aqueous extraction solution comprising water and a trialkylamine at a temperature ranging from about 100 °C to about 200 °C and a sufficient pressure to extract lignin from the lignocellulosic biomass, thereby providing a biomass extraction mixture comprising the water, the trialkylamine, and the lignin solubilized therein, and

removing the trialkylamine from the biomass extraction mixture, thereby forming a solubilized lignin extract,

wherein the aqueous extraction solution comprises:

from about 20 wt% to about 80 wt% water, and

from about 20 wt% to about 80 wt% trialkylamine, wherein the trialkylamine is selected from the group consisting of trimethylamine, triethylamine, tripropylamine, dimethylethylamine, and any combination thereof.

28. A feed material comprising: a lignin extract and extracted lignocellulosic biomass formed by any of the preceding extraction methods, wherein the lignin extract and the extracted lignocellulosic biomass are substantially free from acetamide.

29. A method for enzymatic hydrolysis of at least one of cellulose and hemicellulose, the method comprising:

providing a lignin extract and extracted lignocellulosic biomass formed by any of the preceding extraction methods, wherein the lignin extract and the extracted lignocellulosic biomass are substantially free from acetamide, and the extracted lignocellulosic biomass comprises at least one of cellulose and hemicellulose; and

treating the extracted lignocellulosic biomass with an enzyme.