Stripping vessel for removing hydrocarbons entrained in catalyst particles

Patent metadata

Field	Value
Publication number	US-2016158741-A1
Application number	US-201414561781-A
Country	US
Kind code	A1
Filing date	Dec 5, 2014
Priority date	Dec 5, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

A stripping vessel for removing hydrocarbons from a catalyst and a process for removing hydrocarbons from a catalyst. In an FCC unit, the stripping vessel includes first and second stripping sections. The first stripping section includes at least one grid having a plurality of interesting members and openings therebetween. The second stripping section includes structured packing such as a plurality of ribbons. The one or more grids are spaced from the structured packing, and from each other, so as to minimize the accumulation of catalyst within the stripping vessel, preferably between about 0.91 m (3 ft) to about 1.5 m (5 ft).

First claim

What is claimed is:

1 . A stripping vessel for removing hydrocarbons from catalyst, the stripping vessel comprising:
an inlet configured to receive a stream of spent catalyst particles, at least some of the spent catalyst particles comprise entrained hydrocarbons; a first stripping section, the first stripping section including at least one grid, each grid including at least one opening to allow catalyst to pass there through; a second stripping section, the second stripping section including a structured packing comprised of a plurality of ribbons, the at least one grid in the first stripping section being spaced from the structured packing of the second stripping section; and, an outlet configured to pass catalyst particles from the stripping vessel.

2 . The stripping vessel of claim 1 further comprising:
at least one inlet for a stripping fluid.

3 . The stripping vessel of claim 2 wherein the inlet for stripping fluid is disposed below the second stripping section.

4 . The stripping vessel of claim 1 further comprising:
an internal riser.

5 . The stripping vessel of claim 1 wherein the at least one grid in the first stripping section includes a plurality of openings to allow catalyst there through.

6 . The stripping vessel of the claim 1 , wherein a spacing between the at least one grid in the first stripping section and the structured packing in the second stripping section is between approximately about 0.91 m (3 ft) to about 1.5 m (5 ft).

7 . The stripping vessel of claim 6 further comprising:
a second grid in the first stripping section, the second grid being disposed above the first grid,
wherein a spacing between the at least one grid and the second grid in the first stripping section is between approximately about 0.91 m (3 ft) to about 1.5 m (5 ft).

8 . The stripping vessel of claim 1 wherein the first stripping section comprises a plurality of grids spaced apart from each other.

9 . The stripping vessel of claim 8 where the spacing between adjacent grids in the first stripping section is at least about 0.91 m (3 ft).

10 . The stripping vessel of claim 9 wherein a number of grids in the first stripping section is dependent on a distance between a top of the first stripping section and a top of the second stripping section, such that the grids in the first stripping section are spaced apart at least about 0.91 m (3 ft) and no more than about 1.5 m (5 ft).

11 . A process for stripping hydrocarbons from a catalyst comprising:
passing a stream of catalyst particles to a stripping vessel, wherein at least some of the catalyst particles comprise entrained hydrocarbons; passing catalyst particles through a first stripping section of the stripping vessel, the first stripping section including at least one grid; passing catalyst particles through a second stripping section of the stripping vessel, the second stripping section comprising structured packing; and, stripping hydrocarbons from the catalyst particles in at least one of the first stripping section and the second stripping section with a stripping fluid, wherein the at least one of the grid in the first section comprises a plurality of openings for allowing catalyst to pass through the at least one grid.

12 . The process of claim 11 wherein the at least one grid in the first section extends across an entire horizontal cross section of the first stripping section.

13 . The process of claim 11 wherein the at least one grid comprises plurality of generally sector shaped sections.

14 . The process of claim 13 wherein the generally sector shaped sections are separated from adjacent sections by a gap.

15 . The process of claim 11 further comprising:
passing a stripping fluid into the stripping vessel.

16 . The process of claim 11 further comprising:
recovering catalyst particles from the stripping vessel after the catalyst particles have passed through the second stripping section of the stripping vessel.

17 . The process of claim 11 wherein the at least one grid in the first section is spaced from the structured packing in the second stripping section by a distance of at least about 0.91 m (3 ft).

18 . The process of claim 11 wherein each grid in the first section are spaced apart from each other by a distance between about 0.91 m (3 ft) to about 1.5 m (5 ft).

19 . The process of claim 11 wherein the stripping vessel includes a riser configured to transport catalyst particles through the stripping vessel.

20 . The process of claim 19 wherein the riser is disposed within the vessel so as to create an annulus and wherein the first stripping second and the second stripping section are disposed with the annulus.

Assignees

• Uop Llc

Inventors

• Palmas Paolo
• Craig Andrew Jonathan

Classifications

• B01J38/06 Primary

  using steam · CPC title

• B01J2208/00752

  Feeding · CPC title

• B01J2208/00761

  Discharging · CPC title

• B01J8/34

  with stationary packing material in the fluidised bed, e.g. bricks, wire rings, baffles · CPC title

• B01J2219/3221

  Corrugated sheets · CPC title