Methods for digestion of cellulosic biomass solids in the presence of a phenolic solvent
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08B-001/00
C08H-008/00
출원번호
US-0207899
(2014-03-13)
등록번호
US-9340623
(2016-05-17)
발명자
/ 주소
Powell, Joseph Broun
Johnson, Kimberly Ann
출원인 / 주소
Shell Oil Company
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
Digestion of cellulosic biomass solids can be enhanced in the presence of a phenolic solvent. Methods for digesting cellulosic biomass solids can comprise providing cellulosic biomass solids in a digestion medium comprising a phenolic solvent; and heating the cellulosic biomass solids and the digest
Digestion of cellulosic biomass solids can be enhanced in the presence of a phenolic solvent. Methods for digesting cellulosic biomass solids can comprise providing cellulosic biomass solids in a digestion medium comprising a phenolic solvent; and heating the cellulosic biomass solids and the digestion medium in a digestion unit in the presence of molecular hydrogen and a slurry catalyst capable of activating molecular hydrogen, thereby forming an alcoholic component derived from the cellulosic biomass solids and liberating lignin from the cellulosic biomass solids into the digestion medium. The methods can further comprise converting at least a portion of the lignin into a phenolic solvent and returning the phenolic solvent formed from lignin to the cellulosic biomass solids.
대표청구항▼
1. A method comprising: providing cellulosic biomass solids in a digestion medium comprising a phenolic solvent; anddigesting at least a portion of the cellulosic biomass solids by heating the cellulosic biomass solids and the digestion medium in a digestion unit in the presence of molecular hydroge
1. A method comprising: providing cellulosic biomass solids in a digestion medium comprising a phenolic solvent; anddigesting at least a portion of the cellulosic biomass solids by heating the cellulosic biomass solids and the digestion medium in a digestion unit in the presence of molecular hydrogen and a slurry catalyst capable of activating molecular hydrogen, thereby forming an alcoholic component derived from the cellulosic biomass solids and liberating lignin from the cellulosic biomass solids into the digestion medium:wherein the digestion medium comprises about 50% or more of the phenolic solvent by volume;removing at least a portion of the alcoholic component from the digestion unit; exposing at least a portion of the removed alcoholic component to a condensation catalyst, thereby forming a condensation reaction product,wherein the phenolic solvent comprises at least one of eugenol, dihydroeugenol, propoxylated phenols, methoxypropoxylated phenols, and any combination thereof. 2. The method of claim 1, wherein the phenolic solvent is an organic solvent and the digestion medium further comprises another organic solvent. 3. The method of claim 1, wherein the cellulosic biomass solids comprise water in an amount up to about 50% by mass; wherein the water and the phenolic solvent form a biphasic mixture when the cellulosic biomass solids and digestion medium is heated in the presence of molecular hydrogen and the slurry catalyst. 4. The method of claim 1, wherein at least a portion of the liberated lignin accumulates in the phenolic solvent. 5. The method of claim 4, further comprising: removing at least a portion of the digestion medium and the slurry catalyst from the digestion unit; andestablishing a return flow of the slurry catalyst and at least a portion of the digestion medium to the digestion unit. 6. The method of claim 5, further comprising: converting at least a portion of the lignin liberated from the cellulosic biomass solids into a phenolic solvent. 7. The method of claim 6, wherein the liberated lignin is converted into the phenolic solvent external to the digestion unit and is returned thereto in the return flow of the digestion medium. 8. The method of claim 6, wherein the liberated lignin is converted into the phenolic solvent by thermally depolymerizing the lignin, chemically hydrolyzing the lignin, or any combination thereof. 9. The method of claim 8, wherein thermally depolymerizing the lignin comprises heating the lignin to a temperature of at least about 270° C. in the presence of molecular hydrogen and the slurry catalyst. 10. The method of claim 5, wherein the return flow to the digestion unit establishes upwardly directed fluid flow therein. 11. The method of claim 10, wherein the upwardly directed fluid flow at least partially distributes the slurry catalyst within the cellulosic biomass solids in the digestion unit. 12. The method of claim 1, wherein the alcoholic component is admixed with the digestion medium when removed from the digestion unit. 13. The method of claim 1, further comprising: returning a portion of the condensation reaction product to the digestion unit while heating the digestion medium and the cellulosic biomass solids. 14. The method of claim 13, wherein the condensation reaction product is returned to the digestion unit as an upwardly directed fluid flow. 15. The method of claim 1, wherein the phenolic solvent is selected from the group consisting of eugenol, dihydroeugenol, propoxylated phenols, methoxypropoxylated phenols, and any combination thereof. 16. The method of claim 1, wherein the alcoholic component is formed by a catalytic reduction reaction of soluble carbohydrates, the soluble carbohydrates being derived from the cellulosic biomass solids. 17. A method comprising: providing cellulosic biomass solids in a digestion medium comprising an organic solvent;digesting at least a portion of the cellulosic biomass solids by heating the cellulosic biomass solids and the digestion medium in a digestion unit in the presence of molecular hydrogen and a slurry catalyst capable of activating molecular hydrogen, thereby forming an alcoholic component derived from the cellulosic biomass solids and liberating lignin from the cellulosic biomass solids into the digestion medium; andadding more digestion medium comprising a phenolic solvent to the digestion unit while heating the cellulosic biomass solids and the digestion medium, wherein the digestion medium in the digestion unit comprises about 50% or more of the phenolic solvent by volume;removing at least a portion of the alcoholic component from the digestion unit;exposing at least a portion of the removed alcoholic component to a condensation catalyst, thereby forming a condensation reaction product,wherein the phenolic solvent comprises at least one of eugenol, dihydroeugenol, propoxylated phenols, methoxypropoxylated phenols, and any combination thereof. 18. The method of claim 17, further comprising: removing at least a portion of the digestion medium and the slurry catalyst from the digestion unit; andestablishing a return flow of the slurry catalyst and at least a portion of the digestion medium to the digestion unit. 19. The method of claim 18, further comprising: converting at least a portion of the liberated lignin into the phenolic solvent. 20. The method of claim 19, wherein the lignin is converted into the phenolic solvent external to the digestion unit and is returned thereto in the return flow of the digestion medium. 21. The method of claim 19, wherein the lignin is converted into the phenolic solvent by thermally depolymerizing the lignin, chemically hydrolyzing the lignin, or any combination thereof. 22. The method of claim 21, wherein thermally depolymerizing the lignin comprises heating the lignin to a temperature of at least about 270° C. in the presence of molecular hydrogen and the slurry catalyst. 23. The method of claim 18, wherein the return flow to the digestion unit establishes upwardly directed fluid flow therein. 24. The method of claim 23, wherein the upwardly directed fluid flow at least partially distributes the slurry catalyst within the cellulosic biomass solids in the digestion unit. 25. The method of claim 17, further comprising: returning a portion of the condensation reaction product to the digestion unit while heating the digestion medium and the cellulosic biomass solids. 26. The method of claim 17, wherein the condensation reaction product is returned to the digestion unit as an upwardly directed fluid flow.
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