Separation process and apparatus

Patent metadata

Field	Value
Publication number	US-2016045922-A1
Application number	US-201414458418-A
Country	US
Kind code	A1
Filing date	Aug 13, 2014
Priority date	Aug 13, 2014
Publication date	Feb 18, 2016
Grant date	—

Abstract

An apparatus and process is disclosed for mitigating coking in an FCC reactor plenum. The apparatus and process utilize a baffle to create a inner volume for the product vapors to prevent contact with a relatively cool plenum. The baffle also limits the amount of the time the product vapors spend in the plenum minimizing time for coke formation and limit product vapors from entering low fluidization zones.

First claim

1 . An apparatus for separating catalyst from gas comprising:
a vessel containing cyclones for separating catalyst from gas, said cyclones including a gas conduit for removing separated gas from the cyclone; a plenum at the top of the vessel with a plenum outlet for discharging gas from the plenum, said gas conduits extending into said plenum; a baffle in said plenum that defines an inner volume within the plenum, said gas conduit extending to said inner volume; a purge gas inlet in said plenum outside of said inner volume.

2 . The apparatus of claim 1 wherein said plenum outlet is contiguous with said inner volume.

3 . The apparatus of claim 1 further comprising a purge gas conduit extending through the vessel to said purge gas inlet.

4 . The apparatus of claim 3 wherein said cyclones include dip legs for dispensing catalyst from said cyclone and said purge gas conduit enters said vessel below a top of said dip legs.

5 . The apparatus of claim 1 wherein edges of said baffle does not extend all the way to walls of the plenum to provide purge gaps for purge gas to enter the inner volume.

6 . The apparatus of claim 1 further comprising a purge gas distributor in said plenum for providing a plurality of purge gas inlets.

7 . The apparatus of claim 1 further comprising openings in a bottom wall of the plenum outside of the inner volume to provide said purge gas inlets for purge gas from said vessel to enter said plenum.

8 . The apparatus of claim 1 wherein said baffle has an inverted frustoconical configuration.

9 . The apparatus of claim 1 wherein said gas conduit extends to said inner volume and edges of the baffle do not extend all the way to the gas conduit to provide a purge gap for purge gas to enter the inner volume.

10 . The apparatus of claim 1 further comprising shields on an outlet of said gas conduit to prevent large solids from entering the gas conduit from the plenum but including openings for allowing gas to escape from said gas conduit into said plenum.

11 . The apparatus of claim 1 further comprising an unobstructed path between an outlet of said gas conduit and said plenum outlet.

12 . An apparatus for separating catalyst from gas comprising:
a vessel containing cyclones for separating catalyst from gas, said cyclones including a gas conduit for removing separated gas from the cyclone; a plenum at the top of the vessel with a plenum outlet for discharging gas from the plenum, said gas conduits extending into said plenum; a baffle in said plenum that defines an outer volume and an inner volume within the plenum, said gas conduit extending to said inner volume; a purge gas inlet in said outer volume.

13 . The apparatus of claim 12 wherein said plenum outlet is contiguous with said inner volume.

14 . The apparatus of claim 12 further comprising a purge gas conduit extending through the vessel to said purge gas inlet and said cyclones include dip legs for dispensing catalyst from said cyclone and said purge gas conduit enters said vessel below a top of said dip legs.

15 . The apparatus of claim 12 wherein edges of said baffle do not extend all the way to walls of the plenum to provide purge gaps for purge gas to enter the inner volume from said outer volume.

16 . The apparatus of claim 12 further comprising a purge gas distributor in said plenum for providing a plurality of purge gas inlets.

17 . The apparatus of claim 12 further comprising openings in a bottom wall of the plenum in the outer volume to provide said purge gas inlets for purge gas from said vessel to enter said plenum.

18 . An apparatus for separating catalyst from gas comprising:
a vessel containing cyclones for separating catalyst from gas, said cyclones including a gas conduit for removing separated gas from the cyclone; a plenum at the top of the vessel with a plenum outlet for discharging gas from the plenum, said gas conduits extending into said plenum; a baffle in said plenum that defines an outer volume and an inner volume within the plenum, said gas conduit extending to said inner volume and edges of said baffle do not extend all the way to walls of the plenum to provide purge gaps for purge gas to enter the inner volume from said outer volume; and a purge gas inlet in said outer volume.

19 . The apparatus of claim 18 further comprising a purge gas conduit extending through the vessel to said purge gas inlet and said cyclones include dip legs for dispensing catalyst from said cyclone and said purge gas conduit enters said vessel below a top of said dip legs.

20 . The apparatus of claim 18 wherein said baffle has an inverted frustoconical configuration.

Assignees

• Uop Llc

Inventors

• Umar Syed Basheer
• Zavala Raul
• Palmas Paolo
• Johnson Ii Richard A

Classifications

• B04C3/04 Primary

  Multiple arrangement thereof {(combined with types according to other groups, B04C7/00)} · CPC title

• B04C5/26

  for series flow · CPC title

• B01D45/08

  by impingement against baffle separators · CPC title

• C10G11/18

  according to the "fluidised-bed" technique · CPC title

• B01D45/16

  generated by the winding course of the gas stream {, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes} · CPC title