Chemical reactor

• US 7,033,553 B2
• Filed: 01/25/2001
• Issued: 04/25/2006
• Est. Priority Date: 01/25/2000
• Status: Expired due to Fees

• Current Assignee: Meggitt PLC
• Original Assignee: Meggitt PLC
• Inventors: Johnston, Anthony, Levy, William
• Primary Examiner(s): Tran, Len
• Application Number:
  US09/769,577
• Publication Number:
  US 20020018739A1
• Time in Patent Office: 1,916 Days
• Field of Search: 422/198, 422/199, 422/188, 422/189, 422/190, 422/193
• US Class Current: 422/199
• CPC Class Codes: B01J 19/0013 Controlling the temperature of the process
• CPC Class Codes: B01J 2208/0015 Plates; Cylinders
• CPC Class Codes: B01J 2208/00212 Plates; Jackets; Cylinders
• CPC Class Codes: B01J 2208/00221 comprising baffles for guiding the flow of the heat exchange medium
• CPC Class Codes: B01J 2219/00085 Plates; Jackets; Cylinders
• CPC Class Codes: B01J 2219/182 horizontal
• CPC Class Codes: B01J 8/0221 in a cylindrical shaped bed B01J8/0214 takes precedence
• CPC Class Codes: B01J 8/0285 Heating or cooling the reactor for tubular reactors in furnaces B01J8/062
• CPC Class Codes: B01J 8/0292 with stationary packing material in the bed, e.g. bricks, wire rings, baffles
• CPC Class Codes: B01J 8/0438 the beds being placed next to each other
• CPC Class Codes: B01J 8/0496 Heating or cooling the reactor
• CPC Class Codes: C01C 1/0435 Horizontal reactors
• CPC Class Codes: F28D 9/0006 the plate-like or laminated conduits being enclosed within a pressure vessel
• CPC Class Codes: F28D 9/0031 the conduits for one heat-exchange medium being formed by paired plates touching each other F28D9/0012, F28D9/0025, F28D9/0081, F28D9/04 take precedence
• CPC Class Codes: F28F 2260/02 having microchannels
• CPC Class Codes: F28F 3/048 in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels
• CPC Class Codes: Y02P 20/52 using catalysts, e.g. selective catalysts

Abstract

A reactor comprises a reaction zone, optionally containing a catalyst bed, and heat exchange means inoperative contact with the reaction zone, e.g. embedded in a catalyst bed, and arranged so as to received reactants for heat exchange purposes, wherein the heat exchange means is formed from a plurality of superposed metal plates wherein fluid flow channels have been formed, according t a pre-determined pattern, the channel-bearing plates being aligned during superposition to define discrete heat exchange pathways respectively for reactant and working fluids, and the said plates are diffusion bonded together.

Claims

1. A reactor comprising

(a) a reaction zone that receives reactants for reaction purposes;

and

(b) a heat exchanger in operative contact with the reaction zone so as to receive the reactants exiting the reaction zone for heat exchange purposes, wherein the heat exchanger is formed from a heat exchange panel that includes a plurality of superposed metal printed circuit heat exchange (PCHE) plates bearing fluid flow channels, the channel-bearing PCHE plates being (i) aligned during superposition to define discrete heat exchange pathways for fluids, and (ii) diffusion bonded together.

2. A reactor according to claim 1, wherein the reaction zone comprises at least one catalyst bed.

3. A reactor according to claim 1, wherein the fluid flow channels are formed by chemically etching the channel-bearing PCHE plates.

4. A reactor according to claim 1, wherein the fluid flow channels are formed by hydraulically milling the channel-bearing PCHE plates.

5. A reactor according to claim 1, wherein multiple heat exchange panels are embedded within the reaction zone, and wherein a contact face area of the panels is generally equal to a contact face area of the reaction zone.

6. A reactor according to claim 1, wherein a plurality of reaction zones are arranged in succession, and wherein a heat exchange panel is arranged between each set of adjacent reaction zones.

7. A reactor according to claim 6, wherein at least three reaction zones are arranged in series.

8. A reactor according to claim 6, wherein the heat exchange panel has a thickness of up to about 100 mm.

9. A reactor according to claim 1, wherein the heat exchange panel includes passages comprising tortuous pathways with one of convolution and zigzags.

10. A reactor according to claim 1, wherein the reaction zone comprises a catalyst bed including a variable form catalyst.

11. A reactor according to claim 1, further comprising a screen that restrains catalyst particles from entering the passages of the heat exchanger panel.

12. A reactor according to claim 1, wherein the fluid flow channels are formed with a tool.

13. A reactor according to claim 12, wherein the fluid flow channels are formed with a water jet.

14. A reactor according to claim 1, wherein the heat exchange pathways are completely separated from one another to prevent contact of the fluids flowing along the respective pathways and to prevent the reactants from reacting within the pathways.

15. A reactor according to claim 1, further comprising:

a reactant fluid inlet;

a reactant fluid outlet;

first and second adjacent catalyst beds each including a catalyst; and

at least two channels that are formed in the PCHE that are separated from one another, the first channel permitting flow of reactant fluid from the first catalyst bed to the second catalyst bed, and the second channel permitting flow of a heat exchange fluid therethrough.

16. A reactor according to claim 15, wherein the reactor is a moving bed reactor, and wherein a catalyst outlet is provided adjacent a lower end of each of the catalyst beds such that the catalyst can be urged through the catalyst outlet by gravity and catalyst can be passed through the catalyst inlet.

17. A reactor according to claim 15, further comprising an additional heat exchanger in communication with the reactant fluid inlet, the additional heat exchanger containing pre-heat channels.

18. A reactor according to claim 15, further comprising a fine mesh that covers ends of the channel adjacent the catalytic beds.

19. A reactor according to claim 15, wherein the heat exchanger is formed from plates, the plates being diffusion bonded together.

20. A reactor according to claim 15, wherein the heat exchanger includes passages comprising tortuous pathways with at least one of convolutions and zigzags.

21. A reactor comprising:

(a) a reaction zone that receives reactants for reaction purposes; and

(b) a heat exchanger in operative contact with the reaction zone so as to receive reactants subseciuently exiting the reaction zone for heat exchange purposes, wherein the heat exchanger is formed from a heat exchange panel that includes a plurality of superposed metal printed circuit heat exchange (PCHE) plates bearing fluid flow channels, the channel-bearing PCHE plates being (i) aligned during superposition to define discrete heat exchange pathways for fluids, and (ii) diffusion bonded together, wherein the fluid flow channels do not extend completely through the plates.

22. A method for creating a highly uniform temperature profile for reactants moving through a reactor, the method comprising the steps of:

(a) providing a heat exchanger to receive reactants for heat exchange purposes that is formed from a heat exchange panel that includes a plurality of superposed metal printed circuit heat exchange (PCHE) plates fluid flow channels, the channel-bearing PCHE plates being (i) aligned during superposition to define discrete heat exchange pathways for fluids, and (ii) diffusion bonded together;

(b) positioning the heat exchanger in operative contact with a reaction zone of the reactor that receives reactants for reaction purposes; and

(c) directing the reactants exiting from the reaction zone subseciuently through the heat exchanger.

23. A reactor comprising:

(a) a first reaction zone that receives reactants for reaction purposes;

(b) a heat exchanger in operative contact with the first reaction zone so as to receive reactants from the first reaction zone for heat exchange purposes, wherein the heat exchanger is formed from a heat exchange panel that includes a number of superposed metal printed circuit heat exchange (PCHE) plates bearing fluid flow channels that define discrete fluid pathways; and

(c) a second reaction zone in operative contact with the heat exchanger opposite the first reaction zone that receives reactants from the heat exchanger for reaction purposes.