Ionic liquid systems for the processing of biomass, their components and/or derivatives, and mixtures thereof

• US 8,668,807 B2
• Filed: 02/18/2009
• Issued: 03/11/2014
• Est. Priority Date: 02/19/2008
• Status: Active Grant

• Current Assignee: Board of Trustees of The University of Alabama (University of Alabama System)
• Original Assignee: Board of Trustees of The University of Alabama (University of Alabama System)
• Inventors: Rahman, Mustafizur, Rodriguez, Hector, Sun, Ning, Swatloski, Richard P., Daly, Daniel T., Rogers, Robin D.
• Primary Examiner(s): CALANDRA, ANTHONY J
• Application Number:
  US12/735,827
• Publication Number:
  US 20100319862A1
• Time in Patent Office: 1,847 Days
• Field of Search: 162/72
• US Class Current: 162/72
• CPC Class Codes: D21C 3/20 with organic solvents or in solvent environment
• CPC Class Codes: D21C 5/00 Other processes for obtaining cellulose, e.g. cooking cotton linters obtaining fibres for spinning D01C; Processes characterised by the choice of cellulose-containing starting materials

Abstract

Disclosed herein are compositions and methods that involve ionic liquids and biomass. Multiphasic compositions involving ionic liquids and a polymer and uses of such compositions for fractioning various components of biomass are disclosed. Methods of making and using compositions comprising an ionic liquid, biomass, and a catalyst are also disclosed.

Claims

1. A method of fractioning biomass, comprising:

a. providing a liquid fractionation composition comprising the biomass, an ionic liquid, and a fractionation polymer, with a weight ratio of the fractionation polymer to the ionic liquid of about 5;

95 to about 95;

5 wherein the liquid fractionation composition is substantially free of water and wherein the liquid fractionation composition is mono-phasic at a temperature; and

b. adjusting the temperature of the mono-phasic liquid fractionation composition to form a biphasic liquid fractionation composition that comprises a fractionation polymer rich liquid phase and an ionic liquid rich liquid phase, wherein the biomass is fractioned between the phases of the biphasic liquid composition.

2. The method of claim 1, wherein the mono-phasic fractionation composition of step a is formed by treating a mixture of the biomass, the ionic liquid, and the fractionation polymer with heating, microwave radiation, infrared irradiation, or ultrasound irradiation.

3. The method of claim 1, wherein the temperature adjustment of step b is by cooling.

4. The method of claim 1, wherein the ratio of ionic liquid to fractionation polymer is from about 10:

1 to about 1;

10.

5. The method of claim 1, wherein the biomass comprises a lignocelullosic material wherein the fractionation polymer rich liquid phase comprises lignin from the biomass and the ionic liquid rich liquid phase comprises cellulose from the biomass.

6. The method of claim 1, wherein the biomass is a crustacean biomass.

7. The method of claim 1, wherein the ionic liquid is molten at a temperature of from about −

44°

C. to about 120°

C.

8. The method of claim 1, wherein the ionic liquid is substantially free of a nitrogen-comprising base.

9. The method of claim 1, wherein the ionic liquid comprises one or more cations and one or more anions and wherein the cations comprise one or more compounds having the formula

10. The method of claim 1, wherein ionic liquid comprises one or more cations and one or more anions and wherein the one or more cations comprise one or more compounds having the formula:

11. The method of claim 10, wherein the one or more cations comprise an imidazolium ion having the formula:

12. The method of claim 1, wherein the ionic liquid comprises 1-(C₁-C₆ alkyl)-3-methyl-imidazolium halide or 1-(C₁-C₆ alkyl)-3-methyl-imidazolium C₁-C₆ carboxylate.

13. The method of claim 1, wherein the fractionation polymer comprises a polyalkylene glycol.

14. The method of claim 13, wherein the polyalkylene glycol comprises polyethylene glycol or polypropylene glycol.

15. The method of claim 1, wherein the fractionation polymer comprises polyethyleneimine, polybutyletheramine, poly(N-isopropylacrylamide), a copolymer of poly(N-isopropylacrylamide) with polyvinylimidazole, pectin, Ficoll, hydroxypropyl starch, polyvinyl alcohol, a copolymer of polyvinyl alcohol with polyvinylimidazole, polyvinylcaprolactam, polyvinylpyrrolidone, protein, oligopeptide, mixture and ester derivatives thereof.

16. The method of claim 5, further comprising generating cellulose from the ionic liquid rich liquid phase.

17. The method of claim 16, further comprising regenerating ionic liquid after generating cellulose.

18. The method of claim 5, further comprising stripping lignin from the fractionation polymer rich liquid phase.

19. The method of claim 18, further comprising recycle the fractionation polymer after stripping lignin.

20. A liquid fractionation composition, comprising:

biomass, an ionic liquid, and a fractionation polymer, with a weight ratio of the fractionation polymer to the ionic liquid of about 5;

95 to about 95;

5 wherein the composition is a biphasic liquid composition that comprises a fractionation polymer rich liquid phase and an ionic liquid rich liquid phase with the biomass fractioned between the phases of the biphasic liquid composition and wherein the composition is substantially free of water.

21. The composition of claim 20, wherein the fractionation polymer rich liquid phase comprises lignin from the biomass and the ionic liquid rich liquid phase comprises cellulose from the biomass.

22. The composition of claim 21, wherein the ratio of ionic liquid to fractionation polymer is from about 10:

1 to about 1;

10.

23. The composition of claim 21, wherein the biomass comprises a lignocelullosic material.

24. The composition of claim 21, wherein the biomass comprises southern yellow pine.

25. The composition of claim 21, wherein the biomass is a crustacean biomass.

26. The composition of claim 21, wherein the ionic liquid is substantially free of a nitrogen-comprising base.

27. The composition of claim 21, wherein the ionic liquid comprises one or more cations and one or more anions and wherein the cations comprise one or more compounds having the formula

28. The composition of claim 21, wherein ionic liquid comprises one or more cations and one or more anions and wherein the one or more cations comprise one or more compounds having the formula:

29. The composition of claim 28, wherein the one or more cations comprise an imidazolium ion having the formula:

30. The composition of claim 21, wherein the ionic liquid comprises 1-(C₁-C₆ alkyl)-3-methyl-imidazolium halide or 1-(C₁-C₆ alkyl)-3-methyl-imidazolium C₁-C₆ carboxylate.

31. The composition of claim 21, wherein the fractionation polymer comprises a polyalkylene glycol.

32. The composition of claim 31, wherein the polyalkylene glycol comprises polyethylene glycol or polypropylene glycol.

33. The composition of claim 21, wherein the fractionation polymer comprises polyethyleneimine, polybutyletheramine, poly(N-isopropylacrylamide), a copolymer of poly(N-isopropylacrylamide) with polyvinylimidazole, pectin, Ficoll, hydroxypropyl starch, polyvinyl alcohol, a copolymer of polyvinyl alcohol with polyvinylimidazole, polyvinylcaprolactam, polyvinylpyrrolidone, protein, oligopeptide, mixture and ester derivatives thereof.