METHOD FOR PRODUCING MICROCRYSTALLINE CELLULOSE FROM TOBACCO AND RELATED TOBACCO PRODUCT

• US 20130276801A1
• Filed: 04/19/2012
• Published: 10/24/2013
• Est. Priority Date: 04/19/2012
• Status: Active Grant

• Current Assignee: R J Reynolds Tobacco Company (R. J. Reynolds Tobacco), North Carolina State University (University of North Carolina System)
• Original Assignee: R J Reynolds Tobacco Company (R. J. Reynolds Tobacco), North Carolina State University (University of North Carolina System)
• Inventors: Dooly, Grady Lance, Gerardi, Anthony Richard, Byrd, Medwick Vaughan Jr., Chapman, Paul Stuart, Debusk, Samuel Mark, McClanahan, Daivd Neil
• Granted Patent: US 9,339,058 B2
• Time in Patent Office: Days
• US Class Current: 131/297
• CPC Class Codes: A24B 13/00 Tobacco for pipes, for cigars, e.g. cigar inserts, or for cigarettes; Chewing tobacco; Snuff reconstituted tobacco products A24B3/14
• CPC Class Codes: A24B 15/12 of reconstituted tobacco
• CPC Class Codes: A24B 15/241 Extraction of specific substances
• CPC Class Codes: A24B 15/302 by natural substances obtained from animals or plants
• CPC Class Codes: C08H 8/00 Macromolecular compounds derived from lignocellulosic materials pretreatment thereof B27N
• CPC Class Codes: C08L 1/04 Oxycellulose; Hydrocellulose , e.g. microcrystalline cellulose
• CPC Class Codes: C08L 97/02 Lignocellulosic material, e.g. wood, straw or bagasse manufacture of articles made from lignocellulosic material by dry processes B27N
• CPC Class Codes: C09J 101/04 Oxycellulose; Hydrocellulose
• CPC Class Codes: D21C 3/02 with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• CPC Class Codes: D21H 11/02 Chemical or chemomechanical or chemothermomechanical pulp
• CPC Class Codes: D21H 11/12 Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse

Abstract

Methods for producing dissolving grade pulp and microcrystalline cellulose from tobacco are provided. The methods include chemical pulping a tobacco input to form a tobacco pulp. Chemical pulping the tobacco input includes combining the tobacco input with a strong base defining a weight from about 5% to about 50% of the tobacco input, and heating the tobacco input and the strong base with an H-factor from about 500 to about 3,300. Further, the methods include bleaching the tobacco pulp to produce a dissolving grade pulp. Bleaching the tobacco pulp may include chlorination of the tobacco pulp with a chlorine dioxide solution, and caustic extraction of the tobacco pulp with a second strong base. A related tobacco-derived microcrystalline cellulose product is also provided, which can be used as a binder, a filler, and/or a texturizer in a tobacco product, such as a smokeless tobacco product.

Claims

1. A tobacco product, comprising:

a tobacco material; and

a microcrystalline cellulose material derived from a tobacco input.

2. The tobacco product of claim 1, wherein the microcrystalline cellulose material is formed by subjecting the tobacco input to a plurality of operations, including:

chemical pulping the tobacco input to form a tobacco pulp, wherein chemical pulping the tobacco input comprises;

combining the tobacco input with a strong base, and

heating the tobacco input and the strong base; and

bleaching the tobacco pulp to produce a dissolving grade pulp, wherein bleaching the tobacco pulp comprises;

chlorination of the tobacco pulp with a chlorine dioxide solution, and

caustic extraction of the tobacco pulp with a second strong base.

3. The tobacco product of claim 2, wherein the strong base defines a weight from about 5% to about 50% of the tobacco input.

4. The tobacco product of claim 2, wherein heating the tobacco input and the strong base is conducted with an H-factor from about 500 to about 3,300.

5. The tobacco product of claim 2, wherein the dissolving grade pulp defines a brightness of at least about 83%.

6. The tobacco product of claim 2, wherein the dissolving grade pulp comprises at least about 88% alpha-cellulose by weight.

7. The tobacco product of claim 2, wherein the dissolving grade pulp defines a viscosity between about 2 centipoise and about 15 centipoise in a solution of 0.5% cupriethylenediamine by weight.

8. The tobacco product of claim 2, wherein the dissolving grade pulp defines a degree of polymerization of less than about 750.

9. The tobacco product of claim 2, wherein the tobacco pulp defines a kappa number of less than about 23.

10. The tobacco product of claim 1, wherein the microcrystalline cellulose product is configured as a binder.

11. The tobacco product of claim 1, wherein the microcrystalline cellulose product is configured as a filler.

12. The tobacco product of claim 1, wherein the microcrystalline cellulose product is configured as a texturizer.

13. A method for processing tobacco, the method comprising:

i) chemical pulping a tobacco input to form a tobacco pulp, wherein chemical pulping the tobacco input comprises;

combining the tobacco input with a strong base having a weight from about 5% to about 50% of the weight of the tobacco input, and

heating the tobacco input and the strong base with an H-factor from about 500 to about 3,300; and

ii) bleaching the tobacco pulp to produce a dissolving grade pulp.

14. The method of claim 13, wherein the tobacco input comprises tobacco stalk.

15. The method of claim 13, wherein the tobacco input comprises reconstituted tobacco.

16. The method of claim 13, further comprising drying the tobacco input prior to chemical pulping the tobacco input.

17. The method of claim 13, further comprising depithing the tobacco input prior to chemical pulping the tobacco input.

18. The method of claim 13, further comprising milling the tobacco input prior to chemical pulping the tobacco input.

19. The method of claim 13, further comprising mixing water with the tobacco pulp to form a slurry;

filtering the slurry with a filter such that a portion of the tobacco pulp is removed.

20. The method of claim 19, wherein the filter defines a plurality of apertures having a maximum dimension up to 0.01 inches.

21. The method of claim 19, wherein filtering the slurry comprises receiving a first portion of the tobacco pulp through the filter and receiving a second portion of the tobacco pulp through the filter after receiving the first portion, wherein at least the second portion of the tobacco pulp is subjected to the bleaching.

22. The method of claim 21, wherein the strong base employed in chemical pulping the tobacco input defines a weight from about 30% to about 40% of the tobacco input.

23. The method of claim 22, wherein the H-factor is from about 900 to about 1,100.

24. The method of claim 19, further comprising removing at least a portion of the water from the tobacco pulp received through the filter prior to the bleaching.

25. The method of claim 19, wherein the portion of the tobacco pulp that is removed defines a weight that is greater than about 25% of the tobacco pulp prior to filtering.

26. The method of claim 19, wherein the strong base employed in chemical pulping the tobacco input defines a weight that is less than about 30% of the tobacco input.

27. The method of claim 26, wherein the H-factor is less than about 900.

28. The method of claim 13, wherein the strong base employed in chemical pulping the tobacco input defines a weight that is greater than about 40% of the tobacco input.

29. The method of claim 28, wherein the H-factor is greater than about 900.

30. The method of claim 13, wherein bleaching the tobacco pulp comprises:

chlorination of the tobacco pulp with a chlorine dioxide solution, and

caustic extraction of the tobacco pulp with a second strong base.

31. The method of claim 30, wherein chlorination of the tobacco pulp with a chlorine dioxide solution comprises in situ acidification of sodium chlorite.

32. The method of claim 30, further comprising neutralizing a remaining portion of the chlorine dioxide solution with sodium sulfite.

33. The method of claim 30, further comprising agitating the tobacco pulp during the chlorination of the tobacco pulp with the chlorine dioxide solution.

34. The method of claim 30, wherein bleaching the tobacco pulp to produce the dissolving grade pulp is conducted in an ordered sequence comprising:

chlorination of the tobacco pulp with the chlorine dioxide solution,

caustic extraction of the tobacco pulp with the second strong base, and

chlorination of the tobacco pulp with a second chlorine dioxide solution.

35. The method of claim 30, wherein bleaching the tobacco pulp to produce the dissolving grade pulp is conducted in an ordered sequence comprising:

chlorination of the tobacco pulp with the chlorine dioxide solution,

caustic extraction of the tobacco pulp with the second strong base,

chlorination of the tobacco pulp with a second chlorine dioxide solution, and

chlorination of the tobacco pulp with a third chlorine dioxide solution.

36. The method of claim 30, wherein the chlorine dioxide solution comprises sulfuric acid.

37. The method of claim 13, further comprising boiling the dissolving grade pulp in the presence of hydrochloric acid to produce a boiled dissolving grade pulp.

38. The method of claim 37, further comprising filtering a microcrystalline cellulose residue from the boiled dissolving grade pulp.

39. The method of claim 38, further comprising drying and milling the microcrystalline residue to produce a microcrystalline powder.

40. The method of claim 13, wherein the tobacco input and the strong base are heated to a maximum temperature from about 150°

C. to about 180°

C.

41. The method of claim 13, wherein chemical pulping the tobacco input is conducted in a pressurized vessel.

42. The method of claim 41, further comprising agitating the tobacco input in the vessel.

43. A dissolving grade pulp derived from tobacco, the dissolving grade pulp characterized by a brightness of at least about 83% and an alpha-cellulose concentration of at least about 88% by weight.

44. The dissolving grade pulp of claim 43, wherein the dissolving grade pulp is formed by subjecting a tobacco input to the following operations:

chemical pulping the tobacco input to form a tobacco pulp; and

bleaching the tobacco pulp.

45. The dissolving grade pulp of claim 44, wherein chemical pulping the tobacco input comprises:

combining the tobacco input with a strong base; and

heating the tobacco input and the strong base.

46. The dissolving grade pulp of claim 44, wherein bleaching the tobacco pulp comprises:

chlorination of the tobacco pulp with a chlorine dioxide solution; and

caustic extraction of the tobacco pulp with a second strong base.