Process for treating and/or forming a non-Newtonian fluid using microchannel process technology

• US 8,048,383 B2
• Filed: 04/20/2007
• Issued: 11/01/2011
• Est. Priority Date: 04/20/2006
• Status: Expired due to Fees

• Current Assignee: Velocys Incorporated (Velocys PLC)
• Original Assignee: Velocys Incorporated (Velocys PLC)
• Inventors: Kilanowski, David, Tonkovich, Anna Lee, Arora, Ravi, Daymo, Eric
• Primary Examiner(s): Bullock; In Suk
• Assistant Examiner(s): Kingan; Timothy G
• Application Number:
  US11/737,955
• Publication Number:
  US 20070256736A1
• Time in Patent Office: 1,656 Days
• Field of Search: None
• US Class Current: 422/198
• CPC Class Codes: A61P 17/00 Drugs for dermatological disorders
• CPC Class Codes: B01F 23/41 Emulsifying
• CPC Class Codes: B01F 25/3142 the conduit having a plurality of openings in the axial direction or in the circumferential direction
• CPC Class Codes: B01F 33/30 Micromixers
• CPC Class Codes: B01F 35/92 for heating the outside of the receptacle, e.g. heated jackets or burners
• CPC Class Codes: B01J 19/0093 Microreactors, e.g. miniaturised or microfabricated reactors laboratory containers with capillary fluid transport in microfabricated channels or chambers B01L3/5027
• CPC Class Codes: B01J 2219/00835 Comprising catalytically active material
• CPC Class Codes: B01J 2219/00837 comprising coatings other than catalytically active coatings
• CPC Class Codes: B01J 2219/00844 Comprising porous material
• CPC Class Codes: B01J 2219/0086 Dimensions of the flow channels
• CPC Class Codes: B01J 2219/00873 Heat exchange
• CPC Class Codes: B01J 2219/00889 Mixing
• CPC Class Codes: B01J 2219/00891 Feeding or evacuation
• CPC Class Codes: F28D 7/0025 the conduits for one medium or the conduits for both media being flat tubes or arrays of tubes
• CPC Class Codes: F28D 9/0081 the conduits for one heat-exchange medium being formed by a single plate-like element F28D9/0012 takes precedence; the conduits for one heat-exchange medium being integrated in one single plate-like element F28D9/0012 takes precedence
• CPC Class Codes: F28F 2260/02 having microchannels
• CPC Class Codes: F28F 3/086 having one or more openings therein forming tubular heat-exchange passages
• CPC Class Codes: Y10T 137/0335 Controlled by consistency of mixture
• CPC Class Codes: Y10T 137/2506 By viscosity or consistency

Abstract

The disclosed invention relates to a process, comprising: conducting unit operations in at least two process zones in a process microchannel to treat and/or form a non-Newtonian fluid, a different unit operation being conducted in each process zone; and applying an effective amount of shear stress to the non-Newtonian fluid to reduce the viscosity of the non-Newtonian fluid in each process zone, the average shear rate in one process zone differing from the average shear rate in another process zone by a factor of at least about 1.2.

Claims

1. A process, comprising:

conducting unit operations in at least two process zones in a process microchannel to treat and/or form a non-Newtonian fluid, a different unit operation being conducted in each process zone;

exchanging heat between the process microchannel and a heat exchange channel and

applying an effective amount of shear stress to the non-Newtonian fluid to reduce the viscosity of the non-Newtonian fluid in each process zone, the average shear rate in one process zone differing from the average shear rate in another process zone by a factor of at least about 1.2 and wherein the average shear rate in at least one process zone is in excess of about 100 sec<sup>−

1</sup>.

2. The process of claim 1 wherein the process microchannel has a converging cross-sectional area in at least one process zone, the shear stress being applied to the non-Newtonian fluid by flowing the non-Newtonian fluid through the converging cross-sectional area.

3. The process of claim 1 wherein the process microchannel comprises surface features on and/or in one or more interior surfaces in at least one process zone, the shear stress being applied to the non-Newtonian fluid by flowing the non-Newtonian fluid in contact with the surface features.

4. The process of claim 1 wherein the process microchannel comprises one or more interior structured walls in at least one process zone, the shear stress being applied to the non-Newtonian fluid by flowing the non-Newtonian fluid in contact with one or more structured walls.

5. The process of claim 1 wherein the process microchannel comprises one or more internal obstructions in at least one process zone, the shear stress being applied to the non-Newtonian fluid by flowing the non-Newtonian fluid in contact with one or more internal obstructions.

6. The process of claim 1 wherein the process microchannel comprises a coating layer containing voids and/or protrusions on one or more interior surfaces in at least one process zone, the shear stress being applied to the non-Newtonian fluid by flowing the non-Newtonian fluid in contact with the coating layer.

7. The process of claim 1 wherein each unit operation comprises a chemical reaction, chemical separation, condensation, vaporization, heating, cooling, compression, expansion, phase separation, mixing, or a combination of two or more thereof.

8. The process of claim 1 wherein the non-Newtonian fluid comprises a multiphase mixture, solids being dispersed in the multiphase mixture.

9. The process of claim 1 wherein a first fluid and a second fluid are in the process microchannel;

the first fluid, second fluid, mixture of the first fluid and second fluid, and/or product made by reacting the first fluid with the second fluid being a non-Newtonian fluid.

10. The process of claim 1 wherein the process microchannel is formed from parallel spaced sheets and/or plates.

11. The process of claim 1 wherein the process microchannel exchanges heat with at least one heat exchange channel, the process microchannels and heat exchange channel being formed from parallel spaced sheets and/or plates, the heat exchange channel being adjacent to and/or in thermal contact with the process microchannel.

12. The process of claim 3 wherein the surface features are in the form of depressions in and/or projections from one or more of the microchannel interior walls that are oriented at oblique angles relative to the direction of flow of fluid through the microchannel.

13. The process of claim 3 wherein a first fluid and a second fluid are mixed and the surface features are in the form of at least two surface feature regions wherein mixing of the first fluid and second fluid is conducted in a first surface feature region followed by flow in a second surface feature region wherein the flow pattern in the second surface feature region is different than the flow pattern in the first surface feature region.

14. The process of claim 1 wherein the process is conducted in a microchannel processing unit comprising one or more inlet manifolds and a plurality of the process microchannels, the process comprising flowing a Newtonian and/or non-Newtonian fluid through the one or more inlet manifolds and distributing the Newtonian and/or non-Newtonian fluid to the plurality of process microchannels, the Quality Index Factor being less than about 20%.

15. The process of claim 1 wherein the process is conducted in a microchannel processing unit comprising a plurality of the process microchannels, the process comprising flowing the non-Newtonian fluid in the plurality of process microchannels, the shear rate of the non-Newtonian fluid in the process microchannels being in excess of about 100 sec⁻

1, the shear force deviation factor (SFDF) being less than about 2.

16. The process of claim 1 wherein the process is conducted in a microchannel processing unit comprising an inlet manifold and a plurality of the process microchannels, the process comprising flowing a non-Newtonian fluid through the manifold and distributing the non-Newtonian fluid to the plurality of process microchannels, the non-Newtonian fluid flowing straight through the inlet manifold without making any turns in the manifold.

17. The process of claim 1 wherein the process is conducted in a microchannel processing unit comprising an inlet manifold and a plurality of the process microchannels and a Newtonian fluid is used to form the non-Newtonian fluid, the process comprising flowing the Newtonian fluid through the manifold and distributing the Newtonian fluid to the plurality of process microchannels, the Newtonian fluid flowing into the inlet manifold and making at least one turn in the inlet manifold prior to entering the process microchannels.

18. The process of claim 1 wherein the process is conducted in a microchannel processing unit comprising an inlet manifold and a plurality of the process microchannels, the process comprising flowing a feed stream through the inlet manifold and distributing the feed stream to the plurality of process microchannels, the feed stream flowing through flow distribution features.

19. The process of claim 1 wherein each unit operation comprises heating the non-Newtonian fluid, cooling the non-Newtonian fluid, forming the non-Newtonian fluid by mixing two or more fluids, contacting and/or mixing the non-Newtonian fluid with one or more other fluids and/or particulate solids, conducing a reaction using two or more fluids to form a non-Newtonian fluid, conducting a reaction using as the reactant one or more non-Newtonian fluids, compressing the non-Newtonian fluid, expanding the non-Newtonian fluid, condensing the non-Newtonian fluid, vaporizing the non-Newtonian fluid, separating one or more components from the non-Newtonian fluid, or a combination of two or more thereof.

20. The process of claim 1 wherein the heat source and/or heat sink comprises at least one heat exchange channel.

21. The process of claim 20 wherein a heat exchange fluid is in the heat exchange channel.

22. The process of claim 21 wherein the heat exchange fluid undergoes a phase change in the heat exchange channel.

23. The process of claim 20 wherein an endothermic process or an exothermic process is conducted in the heat exchange channel.

24. The process of claim 21 wherein the heat exchange fluid comprises air, steam, liquid water, carbon monoxide, carbon dioxide, gaseous nitrogen, liquid nitrogen, at least one gaseous hydrocarbon, at least one liquid hydrocarbon, or a combination of two or more thereof.

25. The process of claim 1 wherein the heat source and/or heat sink comprises an electric heating element, a resistance heater and/or a non-fluid cooling element.

26. A process, comprising:

conducting unit operations in at least two process zones in a process microchannel to treat and/or form a non-Newtonian fluid, a different unit operation being conducted in each process zone; and

applying an effective amount of shear stress to the non-Newtonian fluid to reduce the viscosity of the non-Newtonian fluid in each process zone, the average shear rate in one process zone differing from the average shear rate in another process zone by a factor of at least about 1.2;

wherein the process microchannel comprises surface features on and/or in one or more interior surfaces in at least one process zone, the shear stress being applied to the non-Newtonian fluid by flowing the non-Newtonian fluid in contact with the surface features, the surface features comprising two or more layers stacked on top of each other and/or intertwined in a three-dimensional pattern.

27. A process, comprising:

conducting unit operations in at least two process zones in a process microchannel to treat and/or form a non-Newtonian fluid, a different unit operation being conducted in each process zone; and

applying an effective amount of shear stress to the non-Newtonian fluid to reduce the viscosity of the non-Newtonian fluid in each process zone, the average shear rate in one process zone differing from the average shear rate in another process zone by a factor of at least about 1.2;

wherein the non-Newtonian fluid is a reactant and/or a product in a chemical reaction, the reaction being a gas-liquid reaction, liquid-liquid reaction, gas-liquid-liquid reaction, gas-liquid-solid reaction, or a liquid-liquid-solid reaction.

28. A process, comprising:

conducting unit operations in at least two process zones in a process microchannel to treat and/or form a non-Newtonian fluid, a different unit operation being conducted in each process zone; and

applying an effective amount of shear stress to the non-Newtonian fluid to reduce the viscosity of the non-Newtonian fluid in each process zone, the average shear rate in one process zone differing from the average shear rate in another process zone by a factor of at least about 1.2;

wherein the non-Newtonian fluid is a reactant and/or a product in a chemical reaction, the reaction being an oxidation reaction, hydrocraking reaction, hydrogenation reaction, hydration reaction, carbonylation reaction, sulfation reaction, sulfonation reaction, oligomerization reaction or polymerization reaction.

29. A process, comprising:

conducting unit operations in at least two process zones in a process microchannel to treat and/or form a non-Newtonian fluid, a different unit operation being conducted in each process zone; and

applying an effective amount of shear stress to the non-Newtonian fluid to reduce the viscosity of the non-Newtonian fluid in each process zone, the average shear rate in one process zone differing from the average shear rate in another process zone by a factor of at least about 1.2;

wherein at least one unit operation comprises a chemical reaction wherein the non-Newtonian fluid is a reactant and/or a product, the chemical reaction being conducted in the presence of a catalyst.

30. The process of claim 29 wherein the catalyst comprises a homogeneous catalyst, or is in the form of particulate solids, is washcoated on one or more interior surfaces of the process microchannel, or is grown on one or more interior surfaces of the process microchannel.