Microfibrous media and packing method for optimizing and controlling highly exothermic and highly endothermic reactions/processes

• US 8,420,023 B2
• Filed: 11/05/2010
• Issued: 04/16/2013
• Est. Priority Date: 11/06/2009
• Status: Active Grant

• Current Assignee: Auburn University, IntraMicron, Inc.
• Original Assignee: Auburn University, IntraMicron, Inc.
• Inventors: Tatarchuk, Bruce, Yang, Hongyun, Kalluri, Ranjeeth, Cahela, Donald
• Primary Examiner(s): Griffin, Walter D
• Assistant Examiner(s): SEIFU, LESSANEWORK T
• Application Number:
  US12/940,792
• Publication Number:
  US 20110135543A1
• Time in Patent Office: 893 Days
• Field of Search: 422/211, 422/222, 422/310, 422/198
• US Class Current: 422/211
• CPC Class Codes: B01J 19/2405 provoking a turbulent flow of the reactants, such as in cyclones, or having a high Reynolds-number
• CPC Class Codes: B01J 19/2495 Net-type reactors
• CPC Class Codes: B01J 19/30 Loose or shaped packing elements, e.g. Raschig rings or Berl saddles, for pouring into the apparatus for mass or heat transfer
• CPC Class Codes: B01J 20/28004 Sorbent size or size distribution, e.g. particle size
• CPC Class Codes: B01J 20/28028 Particles immobilised within fibres or filaments
• CPC Class Codes: B01J 2208/00017 Controlling the temperature
• CPC Class Codes: B01J 2208/00601 Controlling the conductivity
• CPC Class Codes: B01J 2219/30475 comprising catalytically active material
• CPC Class Codes: B01J 2219/30483 Fibrous materials

Abstract

A vessel packed with a microfibrous media made of micron-sized highly conductive fibers, which are able (and may be used) to immobilize various reactive materials including catalysts, sorbents, electrocatalysts, and other chemically reactive solids. The vessel enables fine temperature control and a uniform temperature profile for a range of highly endothermic or exothermic chemical reactions, sorptions, separation processes, mixing operations, and heat transfer applications.

Claims

1. A system comprising:

a. a vessel;

b. an internal packing for enhancing external heat transport into or out of the vessel, the internal packing comprising a microfibrous media made of thermally conductive fibers, wherein an orientation of the internal packing is configured for promoting heat transfer or electrical conduction in a specific direction; and

c. a microfibrous immobilized process and chemical reaction facilitator contained within the internal packing, wherein the microfibrous entrapped process and reaction facilitator increases heat transport and electrical conduction.

2. The internal packing of claim 1 wherein the fibers are selected from the group consisting of silver, zinc, copper, aluminum, nickel, iron, titanium and chromium.

3. The internal packing of claim 1 wherein the thermally conductive fibers are micron-sized.

4. The internal packing of claim 1 wherein the packing is malleable to promote internal contact to internal walls of the vessel.

5. The internal packing of claim 1 wherein the vessel is sealed.

6. The internal packing of claim 1 wherein the vessel is a flow through design, periodically opened, closed or the flow is variable in flow rate or direction.

7. The internal packing of claim 1 wherein the vessel is tubular, rectangular or conical.

8. The internal packing of claim 1 wherein the vessel comprises a container for an entrapped sorbent.

9. The internal packing of claim 1 wherein the vessel comprises a container for an entrapped catalyst.

10. The internal packing of claim 1 wherein the vessel serves as a component in a high efficiency heat exchanger.

11. The internal packing of claim 1 wherein the vessel serves as a thermal sink or phase change thermal moderator.

12. The internal packing of claim 1 wherein the vessel serves as a static mixer.

13. The internal packing of claim 1 wherein the fibers comprise high electrical conductivity.

14. The internal packing of claim 1 wherein the fibers are configured to immobilize a sorbent.

15. The internal packing of claim 1 wherein the fibers are configured to immobilize a catalyst.

16. The internal packing of claim 1 wherein the fibers are configured to immobilize an electro catalyst.

17. The internal packing of claim 1 wherein volume fractions of conduction aid and an immobilized phase are adjusted over ranges.

18. The internal packing of claim 1 wherein the packing is spatially graded.

19. The internal packing of claim 1 wherein the fibers are fused at their junctures to promote heat transfer or electrical conduction.

20. The internal packing of claim 1 wherein a medium in the vessel in contact with the packing is a liquid, a gas, a two phase mixture of liquid and gas, multiple phases of liquids, or multiple phases of liquids and a gas.

21. The internal packing of claim 1 wherein a medium in the vessel in contact with the packing undergoes a phase change.

22. The internal packing of claim 1 wherein selectivity of a process occurring in the vessel depends on temperature.

23. The internal packing of claim 1 wherein the thermally conductive fibers are stacked in layers.

24. The internal packing of claim 1 wherein the packing helps transport heat and reduce thermal excursions associated with nonsteady-state heterogeneous reactions including catalyst regenerations, calcinations, oxidations and autoreductions.

25. The internal packing of claim 1 wherein the packing is stacked or layered onto an assembly apparatus to facilitate packing, unpacking or maintenance of the vessel.

26. The internal packing of claim 1 wherein the internal packing is configured to mount one or more sensors including thermocouples, chemical sensors, flow sensors, or pressure sensors.

27. A vessel containing:

a. a microfibrous media made of thermally conductive fibers; and

b. a microfibrous immobilized process and chemical reaction facilitator contained within the microfibrous media, wherein the microfibrous media and the microfibrous entrapped process and reaction facilitator increase heat transfer and electrical conduction, further wherein an orientation of the microfibrous media is configured for promoting heat transfer or electrical conduction in a specific direction.

28. The vessel of claim 27 wherein the process and reaction facilitator is selected from the group consisting of a catalyst, a sorbent and a chemically reactive material.

29. The vessel of claim 27 wherein the fibers are configured to immobilize a sorbent.

30. The vessel of claim 27 wherein the fibers are configured to immobilize a catalyst.

31. The vessel of claim 27 wherein the fibers are non-metal.

32. The vessel of claim 27 wherein the thermally conductive fibers are micron-sized.

33. The vessel of claim 27 wherein the microfibrous media is malleable.

34. The vessel of claim 27 wherein a fluid perpendicularly or near-perpendicularly passes through the microfibrous media inside the vessel and the thermally conductive microfibrous media transfers the heat from the fluid to the vessel wall for exothermic reaction/processes, and from the vessel wall to the fluid for endothermic reaction/processes.

35. The vessel of claim 27 wherein the microfibrous media is configured as a tube made of at least one of a metal, a metal alloy, carbon, silicon and silicon carbide.

36. The vessel of claim 27 wherein the microfibrous media comprises a catalyst.

37. The vessel of claim 36 wherein the microfibrous media comprises approximately 1-25% the fibers by volume and approximately 0-60% the catalyst by volume.

38. The vessel of claim 36 wherein the catalyst comprise particles of a diameter of approximately 10-300 microns.

39. The vessel of claim 36 wherein the catalyst is in a form of powder, grains, pellets, extrudates, rings, or combinations thereof.

40. The vessel of claim 36 wherein the microfibrous media is in a stack of disks in vessels of axial flow direction, and rolls in the vessels of radial flow direction so that the flow direction is perpendicular or near-perpendicular to layers of the media.

41. The vessel of claim 27 wherein the fibers are made of a metal with high thermal conductivity.

42. The vessel of claim 41 wherein the metal is selected from the group consisting of silver, zinc, copper, aluminum, nickel, iron, titanium, chromium, and metal alloys thereof.

43. The vessel of claim 27 wherein the fibers are made of a non-metal material with high thermal conductivities selected from the group consisting of carbon, silicon, silicon carbide, aluminum nitride and boron nitride.

44. The vessel of claim 27 wherein the fibers comprise a diameter of approximately 1-30 microns.

45. The vessel of claim 27 wherein the fibers are thermal conductivity fibers selected from the group consisting of polycrystalline diamond, graphites, diamond coated fibers, silicon carbides, sapphire, and other polymers, inorganics, composites and coatings thereof.

46. The vessel of claim 27 further comprising one or more sensors coupled to the vessel, wherein the one or more sensors are used to control a process.

47. The vessel of claim 27 wherein the size of the vessel maintains adequate thermal control due to the enhanced conductivity of the media in the radial direction.