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Machine translation
1. (WO2013066941) CATALYTIC MEMBRANES AND APPLICATIONS THEREOF
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS

1. A catalytic membrane comprising:

a surface functionalized with a polymer, the polymer comprising cellulose solubilization functionalities and acid functionalities for the catalytic hydrolysis of cellulose.

2. The catalytic membrane of claim 1, wherein the cellulose solubilization functionalities of the polymer comprise one or more imidazolium salts.

3. The catalytic membrane of claim 2, wherein the one or more imidazolium salts of the formula:


wherein >ΛΛΛΓ is a point of attachment to the polymer chain, X" is a counterion and ¾ selected from the group consisting of hydrogen, alkyl, alkyl-sulfonic acid, alkyl-carboxylic acid and alkyl-phosphonic acid.

4. The catalytic membrane of claim 2, wherein the one or more imidazolium salts comprise imidazolium chlorides.

5. The catalytic membrane of claim 1 , wherein the acid functionalities have a pKa ranging from about 1 to about 5.

6. The catalytic membrane of claim 5, wherein the acid functionalities comprise sulfonic acid, carboxylic acid or phosphonic acid functionalities or mixtures thereof.

7. The catalytic membrane of claim 1 , wherein at least one of the cellulose solubilization functionalities is functionalized with at least one of the acid functionalities for the catalytic hydrolysis of cellulose.

8. The catalytic membrane of claim 1, wherein the polymer comprises a block of repeating units comprising the cellulose solubilization functionalities and a block of repeating units comprising the acid functionalities.

9. The catalytic membrane of claim 1, wherein the polymer comprises a random distribution of repeating units comprising the cellulose solubilization functionalities and repeating units comprising the acid functionalities.

10. The catalytic membrane of claim 1 , wherein the polymer comprises a statistical distribution of repeating units comprising the cellulose solubilization functionalities and repeating units comprising the acid functionalities.

11. The catalytic membrane of claim 1 , wherein the polymer comprises an alternating distribution of repeating units comprising the cellulose solubilization functionalities and repeating units comprising the acid functionalities.

12. The catalytic membrane of claim 1, wherein the surface is a first side of the membrane for receiving cellulose feedstock.

13. The catalytic membrane of claim 12, wherein the membrane is porous.

14. The catalytic membrane of claim 13 having a pore size sufficient to pass glucose molecules, reducing sugar molecules, oligosaccharides or mixtures thereof.

15. The catalytic membrane of claim 14, wherein the oligosaccharides have a molecular weight less than about 500 g/mol.

16. The catalytic membrane of claim 13, wherein a plurality of pores of the porous membrane are functionalized with acid functionalities for the catalytic hydrolysis of cellulose.

17. The catalytic membrane of claim 1 , wherein the polymer is an ionic liquid.

18. The catalytic membrane of claim 12 comprising a second side in facing opposition to the first side, wherein the second side is not functionalized with the polymer.

19. The catalytic membrane of claim 1, wherein the acid functionalities are operable for the catalytic hydrolysis of hemicellulose.

20. A membrane reactor comprising:

a feedstock vessel;

a reaction product collection vessel; and

a catalytic membrane disposed between the feedstock vessel and the reaction product collection vessel, the membrane comprising a feedstock contacting surface functionalized with a polymer, the polymer comprising cellulose solubilization functionalities and acid functionalities for the catalytic hydrolysis of cellulose.

21. The membrane reactor or claim 20, wherein the feedstock vessel contains cellulose, hemicellulose or lignin or mixtures thereof.

22. The membrane reactor of claim 20, wherein the reaction product collection vessel comprises an organic phase for extraction of sugar reaction product passing through the membrane.

23. A method for the hydrolysis of cellulose comprising:

providing a cellulose feedstock;

bringing the cellulose feedstock into contact with a surface of a catalytic membrane, the surface functionalized with a polymer comprising cellulose solubilization functionalities and acid functionalities for the catalytic hydrolysis of the cellulose; at least partially solubilizing the cellulose with the cellulose solubilization functionalities; and

hydrolyzing the solubilized cellulose with the acid functionalities to provide glucose, reducing sugars or oligosaccharides or mixtures thereof.

24. The method of claim 23 further comprising passing the glucose, reducing sugars or oligosaccharides or mixtures thereof through pores of the catalytic membrane to a permeate side of the membrane.

25. The method of claim 24 further comprising hydrolyzing oligosaccharide molecules in the pores of the membrane.

26. The method of claim 25, wherein the oligosaccharide molecules in the pores of the membrane are hydrolyzed by acid functionalities attached to surfaces of the pores.

27. The method of claim 23 further comprising collecting the glucose, reducing sugars or oligosaccharides or mixtures thereof on the permeate side of the membrane.

28. The method of claim 27, wherein collecting comprises extracting the glucose, reducing sugars or oligosaccharides or mixtures thereof into an organic phase.

29. The method of claim 23, wherein the cellulose feedstock further comprises hemicellulose or lignin or mixtures thereof.

30. The method of claim 29 further comprising hydrolyzing hemicellulose with the acid functionalities to provide glucose, xylose, mannose, galactose or arabinose or mixtures thereof.

31. A method of making a catalytic membrane comprising:

grafting onto a surface of the membrane a polymer comprising cellulose solubilization functionalities and acid functionalities for the catalytic hydrolysis of cellulose.

32. The method of claim 31 , wherein grafting comprises providing monomer comprising a cellulose solubilization functionality or cellulose solubilization functionality precursor and polymerizing the monomer with a surface chemical species of the membrane.

33. The method of claim 32 further comprising functionalizing at least a portion of repeating units of the polymer with an acid functionality for the catalytic hydrolysis of cellulose.