Process for pure carbon production

Patent metadata

Field	Value
Publication number	US-10144648-B2
Application number	US-201715618802-A
Country	US
Kind code	B2
Filing date	Jun 9, 2017
Priority date	Mar 15, 2013
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

The disclosure provides for methods of oxidizing carbide anions, or negative ions, from salt like carbides at low temperatures below about 600° C. In another aspect, the disclosure provides for reactions with intermediate transition metal carbides. In yet another aspect, the disclosure provides for a system of reactions where salt-like carbide anions and intermediate carbide anions are oxidized to produce pure carbon of various allotropes.

First claim

What is claimed is:

1. A method of producing elemental carbon with control over the electronic hybridization of the elemental carbon comprising:
chemically oxidatively reacting a carbide with a molten metal salt at a reaction temperature to form the elemental carbon, wherein the reaction temperature is high enough to melt the salt but low enough to control the electronic hybridization of the elemental carbon and control the formation of crystalline graphite from the oxidation of the carbide and also to form a reaction product which is the elemental metal from the reduction of the molten metal salt, wherein the chemical oxidative reaction takes place in the molten metal salt, wherein the metal salt is in excess with respect to the carbide.

2. A method according to claim 1 , wherein the carbide is a salt-like carbide.

3. The method of claim 1 , wherein the carbide is a salt-like carbide which is a methanide, an acetylide, or a sesquicarbide.

4. The method of claim 1 , wherein the carbide is calcium carbide or aluminum carbide.

5. The method of claim 1 , wherein the reaction product comprises elemental carbon with an sp3 hybridization.

6. The method of claim 1 , wherein the reaction product comprises elemental carbon with an sp2 hybridization.

7. The method of claim 1 , wherein the reaction product comprises elemental carbon with an sp1 hybridization.

8. The method of claim 1 , wherein the reaction product comprising elemental carbon comprises one form of carbon.

9. The method of claim 1 , wherein the reaction product comprising elemental carbon comprises one form of carbon which includes graphene like platelets.

10. The method of claim 1 , wherein the reaction product comprising elemental carbon comprises at least two forms of carbon.

11. The method of claim 1 , wherein the reaction product comprising elemental carbon comprises at least two forms of carbon, wherein one form includes graphene like platelets.

12. The method of claim 1 , wherein the reaction product comprising elemental carbon comprises at least two forms of carbon, wherein one form includes a diamond like structure.

13. The method of claim 1 , wherein the reaction product comprising elemental carbon comprises at least two forms of carbon, wherein one form includes graphene like platelets and another form includes a diamond like structure.

14. The method of claim 1 , wherein the reaction product comprising elemental carbon comprises at least two forms of carbon, wherein one form includes graphene like platelets and another form includes a diamond like structure, and the diamond like structure is the preponderance of the reaction product.

15. The method of claim 1 , wherein the reaction temperature is below 600° C.

16. The method of claim 1 , wherein the reaction temperature is 425° C. or below.

17. The method of claim 1 , wherein the reaction temperature is below 300° C.

18. The method of claim 1 , wherein the reaction temperature is 280° C. or below.

19. The method of claim 1 , wherein the metal salt has a melting point of less than 280° C.

20. The method of claim 1 , wherein the metal salt has a melting point of less than 250° C.

21. The method of claim 1 , wherein the metal salt is in excess with respect to the carbide with an excess of at least twice the stoichiometric ratio.

22. The method of claim 1 , wherein the metal salt is in excess with respect to the carbide with an excess of at least twice the stoichiometric ratio, and wherein the reaction temperature is below 300° C.

23. The method of claim 1 , wherein the reaction is carried out in a reactor sealed at atmospheric pressure and heated after sealing.

24. The method of claim 1 , wherein the reaction is carried out in an oxygen free environment.

25. The method of claim 1 , wherein the reaction is carried out in a moisture free environment.

26. The method of claim 1 , wherein the reaction is carried out free of catalyst.

27. The method of claim 1 , wherein the reaction is carried out free of metallic catalyst.

28. The method of claim 1 , wherein the reaction is carried out for at least two hours.

29. The method of claim 1 , wherein the reaction product comprising carbon is washed.

30. The method of claim 1 , wherein the reaction product comprising carbon is washed with acid.

31. The method of claim 1 , wherein the carbide is aluminum carbide, the metal salt is stannous chloride, and the reaction temperature is below 300° C.

32. The method of claim 31 , wherein the stannous chloride is used in excess with respect to the aluminum carbide.

33. The method of claim 32 , wherein the excess is an excess of at least twice the stoichiometric ratio, wherein the stannous chloride is anhydrous stannous chloride, wherein the reaction is carried out in an oxygen free and moisture free environment, and wherein the reaction temperature is 280° C. or below.

34. The method of claim 31 , wherein the stannous chloride is anhydrous stannous chloride.

35. The method of claim 31 , wherein the reaction is carried out in an oxygen free and moisture free environment.

36. The method of claim 31 , wherein the reaction temperature is 280° C. or below.

37. The method of claim 31 , wherein the carbon comprises carbon with a diamond like structure.

38. The method of claim 1 , wherein the carbide is calcium carbide, wherein the metal salt is zinc chloride, and wherein the reaction temperature is below 600° C.

39. The method of claim 38 , wherein the zinc chloride is used in excess with respect to the calcium carbide.

40. The method of claim 39 , wherein the excess is an excess of at least twice the stoichiometric ratio, wherein the zinc chloride is anhydrous zinc chloride, wherein the reaction is carried out in an oxygen free and moisture free environment, and wherein the reaction temperature is 425° C. or below.

41. The method of claim 38 , wherein the zinc chloride is anhydrous zinc chloride.

42. The method of claim 38 , wherein the reaction is carried out in an oxygen free and moisture free environment.

43. The method of claim 38 , wherein the reaction temperature is 425° C. or below.

44. The method of claim 38 , wherein the carbon comprises carbon with a diamond like structure.

45. The method of claim 1 , wherein the carbide is calcium carbide, wherein the metal salt is stannous chloride, and wherein the reaction temperature is below 300° C.

46. The method of claim 45 , wherein the stannous chloride is used in excess with respect to the calcium carbide.

47. The method of claim 46 , wherein the excess is an excess of at least twice the stoichiometric ratio, wherein the stannous chloride is anhydrous stannous chloride, wherein the reaction is carried out in an oxygen free and moisture free environment, and wherein the reaction temperature is 280° C. or below.

48. The method of claim 45 , wherein the stannous chloride is anhydrous stannous chloride.

49. The method of claim 45 , wherein the reaction is carried out in an oxygen free and moisture free envir

Assignees

• Univ West Virginia

Inventors

• Stiller Alfred H

Classifications

• C01B32/05 Primary

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• C01B32/26

  Preparation (by using ultra-high pressure B01J3/06; by crystal growth C30B29/04) · CPC title

• C01F11/28

  by chlorination of alkaline-earth metal compounds · CPC title

• C01B32/25 Primary

  Diamond · CPC title

• C01F7/58

  Preparation of anhydrous aluminium chloride · CPC title