Apparatus for catalytic distillation

• US 6,045,762 A
• Filed: 01/22/1997
• Issued: 04/04/2000
• Est. Priority Date: 01/22/1997
• Status: Expired due to Fees

• Current Assignee: University of Alberta
• Original Assignee: The Governors of the University of Alberta (University of Alberta)
• Inventors: Xu, Zhanping, Chuang, Karl Tze-Tang
• Primary Examiner(s): BHAT, NINA NMN
• Application Number:
  US08/787,355
• Time in Patent Office: 1,168 Days
• Field of Search: 422/192, 422/193, 422/195, 422/191, 202/158, 203/29, 261/97, 261/114.1
• US Class Current: 422/607
• CPC Class Codes: B01D 3/008 Liquid distribution
• CPC Class Codes: B01D 3/009 in combination with chemical reactions
• CPC Class Codes: B01D 3/20 Bubble caps; Risers for vapour; Discharge pipes for liquid
• CPC Class Codes: B01J 8/0484 the beds being placed next to each other
• CPC Class Codes: B01J 8/0492 Feeding reactive fluids for solid material, see B01J8/0015

Abstract

An apparatus for catalytic distillation consists of alternatively a catalyst unit and an active liquid distributor tray. The catalyst unit is formed by series of troughs containing catalysts with spaces between adjacent troughs for vapor flow. The active liquid distributor tray is preferably a V-shaped tray formed with collectors that function as both a liquid distributor to deliver liquid at the appropriate locations to the underneath catalyst unit and a mass transfer device. Liquid flows down to the catalyst toughs from bottom of the sump of each collector and vapor flows up through the upper diverging walls of the collector. Packing materials may be placed on the tray or in the spaces between the troughs or both to enhance mass transfer. The catalyst troughs preferably are partitioned to cause the liquid to flow through the catalyst and to overflow the upper rim of the troughs to escape therefrom whereby the catalyst is maintained submerged.

Claims

1. A gas liquid catalytic distillation apparatus comprising a housing defining a contact chamber having a substantially vertical longitudinal axis and a liquid inlet and gas outlet adjacent to its upper end and a gas inlet and liquid outlet adjacent to its lower end, at least one gas liquid contacting tray traversing said chamber, each of said tray having a plurality of collector means for gas liquid contact, each said collector means having a sump means forming the lowermost portion of each collector means and gas pervious wall means diverging from said sump means to form gas liquid contact zones upstream of said sump means in the direction of liquid flow to said sump means, said sump means defining a liquid condensing and retaining chamber having a width so that sufficient open area is provided at its upstream end to permit gas to separate from foam generated by said gas liquid contact, said sump means having a bottom end at its downstream side in the direction of liquid flow and liquid outlet means at said bottom end, and said gas pervious wall means having a plurality of discrete passages for gas flow through said gas pervious wall means to direct gas passing therethrough into contact with said liquid flowing in over said gas pervious wall means to said sump means, said wall means and said sump means of said collector means being positioned in said contacting tray to distribute and direct said liquid to flow along said tray and into said sump means, a plurality of troughs mounted between and in spaced relationship with a pair of adjacent contacting trays, each of said troughs being positioned directly below one of said sump means in said contacting tray immediately thereabove, said troughs being laterally spaced apart to define gas flow passages therebetween, each of said troughs defining a confined passage for liquid flow having a liquid inlet at its upper end and a liquid outlet at its other end, means for directing liquid from said outlet of one of said sump means immediately thereabove directly into said liquid inlet of said confined passage in said trough immediately therebelow, a catalyst charge in said confined passage, said confined passages in said plurality of troughs between a pair of adjacent contacting trays forming substantially the sole path for liquid movement between said pair of adjacent contacting trays so that substantially all of said liquid from said contacting tray immediately above flows from said liquid outlets in said sump means into said inlets of said plurality of troughs immediately therebelow, through said passages for liquid and said catalyst out and toward said contacting tray immediately therebelow.

2. A gas liquid contactor catalytic distillation apparatus as defined in claim 1 wherein said gas pervious wall means of each of said collector means slope upward in said upstream direction and laterally from said sump means of its said collector means.

3. A gas liquid contactor catalytic distillation apparatus as defined in claim 2 wherein said gas pervious wall means terminate at their ends remote from said sump to define a portion of a periphery of its said collector means and wherein peripheries of adjacent said of collector means in each said contacting tray are in substantially abutting relationship.

4. A gas liquid catalytic distillation apparatus as defined in claim 3 wherein each said collector means is substantially symmetrical relative to a longitudinal axis and said longitudinal axes of said collectors in each said tray are substantially parallel.

5. A gas liquid catalytic distillation apparatus as defined in claim 2 wherein each said collector means is substantially symmetrical relative to a longitudinal axis and said longitudinal axes of said collectors in each said tray are substantially parallel.

6. An apparatus for catalytic distillation as defined in claim 2 wherein said confined passage includes an infeed section leading from said liquid inlet at its upper end to a bottom of said trough and at least one return section extending from said bottom towards said upper end and through which said liquid must pass to reach said liquid outlet and wherein each said liquid outlet of each said trough is formed by an upper rim on its said trough forming a weir over which said liquid must flow on leaving said trough.

7. An apparatus for catalytic distillation as defined in claim 6 wherein said weir is formed by discrete spaced V-shaped outlets through which liquid flows from said trough.

8. An apparatus for catalytic distillation as defined in claim 2 wherein flow passage means interconnect said troughs between an said adjacent pair of said trays to ensure liquid levels in all of said troughs between said pair of said trays are substantially the same.

9. A gas liquid catalytic distillation apparatus as defined in claim 1 wherein said each collector means is substantially symmetrical relative to a longitudinal axis and said longitudinal axes of said collectors in each said tray are substantially parallel.

10. An apparatus for catalytic distillation as defined in claim 1 wherein said means for directing comprises cap means positioned above each of said gas passages to deflect liquid from entering said gas passages and direct such liquid into adjacent inlets of said troughs while diverting gas flowing upwardly from said passages.

11. An apparatus for catalytic distillation as defined in claim 1 wherein said confined passages have their longitudinal axes substantially parallel to said longitudinal axis of said contact chamber.

12. An apparatus for catalytic distillation as defined in claim 1 wherein said tray immediately thereabove will be formed with a plurality of collector means for gas liquid contact, each said collector means having a sump means forming the lowermost portion of each collector means and gas pervious wall means diverging from said sump means to form gas liquid contact zones upstream of said sump means in the direction of liquid flow, said sump means defining a liquid condensing and retaining chamber having an inlet of sufficient area at its upstream end to permit gas to separate from foam generated by said gas liquid contact, said sump means having a bottom at its downstream side in the direction of liquid flow and liquid outlet means through said bottom, and said gas pervious wall means having a plurality of discrete confined passages for gas flow through said wall means to direct gas passing therethrough into contact with said liquid flowing in countercurrent thereto and wherein said means to direct comprises a pipe means for conducting liquid from said liquid outlets through said bottom of said sump directly into said inlet of said trough immediately therebelow.

13. An apparatus for catalytic distillation as defined in claim 1 wherein said confined passage includes an infeed section leading from said liquid inlet at its upper end to a bottom of said trough and at least one return section extending from said bottom towards said upper end and through which said liquid must pass to reach said liquid outlet and wherein each said liquid outlet of each said trough is formed by an upper rim on its said trough forming a weir over which said liquid must flow on leaving said trough.

14. An apparatus for catalytic distillation as defined in claim 13 wherein said weir is formed by discrete spaced V-shaped outlets through which liquid flows from said trough.

15. An apparatus for catalytic distillation as defined in claim 1 wherein a packing is provided in said gas flow passages between said troughs.

16. An apparatus for catalytic distillation as defined in claim 1 wherein a packing is provided between bottoms of said troughs and top of said tray immediately therebelow.

17. An apparatus for catalytic distillation as defined in claim 1 wherein flow passage means interconnect said troughs between an said adjacent pair of said trays to ensure liquid levels in all of said troughs between said pair of said trays are substantially the same.