Controlled reactant injection with permeable plates

• US 6,749,817 B1
• Filed: 06/30/2000
• Issued: 06/15/2004
• Est. Priority Date: 11/11/1997
• Status: Expired due to Fees

• Current Assignee: UOP Llc (Honeywell International Inc.)
• Original Assignee: UOP Llc (Honeywell International Inc.)
• Inventors: Mulvaney, Robert C. III
• Primary Examiner(s): Caldarola, Glenn
• Assistant Examiner(s): WACHTEL, ALEXIS A
• Application Number:
  US09/608,080
• Time in Patent Office: 1,446 Days
• Field of Search: 422/224, 422/200, 422/228, 422/312, 422/198, 422/189, 422/191, 422/239, 422/211, 422/222, 422/178, 422/180, 165/166, 165/167, 165/170, 165/165, 366/340, 366/147, 366/337, 502/521.2
• US Class Current: 422/200
• CPC Class Codes: B01F 25/4322 essentially composed of stacks of sheets, e.g. corrugated sheets
• CPC Class Codes: B01J 19/249 Plate-type reactors
• CPC Class Codes: B01J 19/32 Packing elements in the form of grids or built-up elements for forming a unit or module inside the apparatus for mass or heat transfer
• CPC Class Codes: B01J 2219/2453 Plates arranged in parallel
• CPC Class Codes: B01J 2219/2459 Corrugated plates
• CPC Class Codes: B01J 2219/246 Perforated plates
• CPC Class Codes: B01J 2219/2462 the reactants being in indirect heat exchange with a non reacting heat exchange medium
• CPC Class Codes: B01J 2219/2474 Mixing means, e.g. fins or baffles attached to the plates
• CPC Class Codes: B01J 2219/2475 Separation means, e.g. membranes inside the reactor
• CPC Class Codes: B01J 2219/2498 Additional structures inserted in the channels, e.g. plates, catalyst holding meshes
• CPC Class Codes: B01J 2219/3221 Corrugated sheets
• CPC Class Codes: B01J 2219/32213 Plurality of essentially parallel sheets
• CPC Class Codes: B01J 2219/32237 Sheets comprising apertures or perforations
• CPC Class Codes: B01J 2219/32244 Essentially circular apertures
• CPC Class Codes: B01J 2219/32258 Details relating to the extremities of the sheets, such as a change in corrugation geometry or sawtooth edges
• CPC Class Codes: B01J 2219/32475 involving heat exchange
• CPC Class Codes: B01J 2219/3322 Co-current flow
• CPC Class Codes: B01J 2219/3325 Counter-current flow
• CPC Class Codes: B01J 2219/3327 Cross-current flow
• CPC Class Codes: C07C 303/06 by reaction with sulfuric acid or sulfur trioxide
• CPC Class Codes: C07C 309/31 : by alkyl groups containing at least three carbon atoms
• CPC Class Codes: F28D 21/0015 : Heat and mass exchangers, e.g. with permeable walls
• CPC Class Codes: F28F 3/027 : with openings, e.g. louvered corrugated fins; Assemblies of corrugated strips
• CPC Class Codes: Y02P 20/582 : Recycling of unreacted starting or intermediate materials

Abstract

An arrangement for a fluid distributor-contactor-type reactor uses perforated plates to circulate two reactants in alternate channels defined by spaces between parallel stacked plates to perform controlled distribution and mixing simultaneously with optional indirect heat transfer. One reactant enters one set of channels that serve as reaction channels. A set of second channels interleaved with the reaction channels serve as distribution channels that also provide a heat exchange function. Finely dispersed openings in the perforated plates distribute the reactant at low concentration from the distribution channels into the reaction channels. Dispersal of the reactant through the perforations will enhance the turbulence that is primarily introduced by the corrugated plates to insure good mixing of the reactants in the reaction channels. The pattern and size of the holes on the perforated plates may be varied as desired to disperse a carefully controlled amount of fluid across the plates over a large surface area. By maintaining a low addition rate of injected fluid reactant over the contact area, the concentration of the added reactant in the reaction channels may be kept as low as desired. The plates are preferably corrugated to introduce increased turbulence for promoting better distribution and dispersion of the fluids as one fluid is injected across the perforations. The corrugation angles can also be varied to suit the fluid flow properties of the fluid reactant and in particular varied over the height of the contacting zone to vary fluid residence time over different parts of the plates.

Claims

1. A process for the ethoxylation of liquid organic substances with an ethoxylating liquid, said process comprising:

passing a reactive organic fluid through reaction channels defined by a first side of a plurality of vertically positioned corrugated plates that contain perforations;

circulating a reactant stream containing ethylene oxide through distribution channels defined by the second side of said vertical positioned plates to indirectly exchange heat with said organic fluid;

distributing a portion of the reactant stream through the perforations, and contacting the reactant stream with the organic fluid in said reaction channels; and

recovering a reaction product from said reaction channels.

2. The process of claim 1 wherein one of said ethoxylation reactants comprises an alcohol or an alkylphenol.

3. A reactor for the controlled distribution of reactants comprising:

a plurality of contacting plates containing perforations or permeable sections stacked adjacent to one another to define reaction channels between first sides of adjacent plates;

means for passing a first fluid into the reaction channels;

a distribution channel located between each reaction channel defined by the second side of the plates for distributing a second fluid through the plates and circulating the second fluid as an indirect heat exchange medium;

means for supplying said second fluid to the distribution channels; and

means for collecting a fluid stream containing a reaction product from the reaction channels.

4. The reactor of claim 3 wherein said plates define corrugations that extend at least partially in a horizontal direction.

5. The reactor of claim 3 wherein the adjacent surfaces of the plates contact each other.

6. The reactor of claim 3 wherein the frequency or the size of perforations varies over the surface of said plate.

7. A reactor for the controlled distribution of reactants comprising:

a plurality of contacting plates each containing perforations or permeable sections stacked adjacent to one another to define reaction channels between first sides of adjacent plates;

means for passing a first fluid into the reaction channels;

a distribution channel located adjacent each reaction channel defined by the second side of the plates for distributing a second fluid through the perforations or permeable sections in the plates and circulating the second fluid as an indirect heat exchange medium;

means for supplying said second fluid to the distribution channels; and

means for collecting a fluid stream containing a reaction product from the reaction channels.