FCC counter-current regenerator with a regenerator riser

Patent metadata

Field	Value
Publication number	US-10239054-B2
Application number	US-201715828186-A
Country	US
Kind code	B2
Filing date	Nov 30, 2017
Priority date	Dec 27, 2016
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A counter-current catalyst regenerator with at least two stages of counter-current contact along with a regenerator riser is proposed. Each stage may comprise a permeable barrier that allows upward passage of oxygen-containing gas and downward passage of coked catalyst into each stage, but inhibits upward movement of catalyst to mitigate back mixing and approximate true counter-current contact and efficient combustion of coke from catalyst. The regenerator riser may provide a passage to transport the catalyst and may serve as a secondary stage for coke combustion to provide the regenerated catalyst.

First claim

The invention claimed is:

1. A process for combusting coke from coked catalyst in a regenerator vessel comprising a separation section and a regeneration section located below the separation section, the process comprising:
providing a coked catalyst to the regeneration section through a catalyst inlet in the regeneration section;
passing the coked catalyst downwardly through a one or more stages, each of the one or more stages comprising a permeable barrier;
passing a primary stream of oxygen-containing gas upwardly through the one or more stages in counter-current contact with the coked catalyst to combust coke from the coked catalyst to provide a regenerated catalyst and a flue gas;
passing the regenerated catalyst from the regeneration section to a bottom of the regenerator riser;
propelling the regenerated catalyst via a secondary stream of gas to move the regenerated catalyst from the bottom of the regenerator riser to an outlet located in the separation section;
discharging the regenerated catalyst to the separation section from the outlet of the regenerator riser; and
passing the regenerated catalyst from a regenerated catalyst outlet in the separation section to a riser reactor through a regenerated catalyst standpipe.

2. The process of claim 1 , wherein the step of passing the primary stream of oxygen-gas containing gas in counter-current contact with the coked catalyst provides a partially regenerated catalyst.

3. The process of claim 2 , wherein the step of propelling the regenerated catalyst through the regenerator riser provides a completely regenerated catalyst via combustion of coke from the partially regenerated catalyst.

4. The process of claim 1 , wherein the bottom of the regenerator riser is located below the regeneration section and in is communication via a regenerator riser conduit extending from a regeneration bottoms outlet to an inlet of the regenerator riser.

5. The process of claim 1 further comprising delivering the coked catalyst above the one or more stages and distributing the primary stream of oxygen-containing gas below the one or more stages.

6. The process of claim 1 , wherein a top of the regenerator riser comprises a disengaging zone comprising the outlet for discharging the regenerated catalyst.

7. The process of claim 1 wherein the permeable barrier inhibits upward movement of the coked catalyst.

8. The process of claim 1 , wherein the regenerated catalyst outlet is located above the catalyst inlet.

9. The process of claim 1 , wherein passing the coked catalyst downwardly through the one or more stages comprises:
passing a first stream of coked catalyst downwardly through a first permeable barrier into a first stage;
passing a first stream of oxygen-containing gas upwardly through the first stage in counter-current contact with the first stream of coked catalyst to combust coke from the first stream of coked catalyst to provide a second stream of coked catalyst including regenerated catalyst and a stream of flue gas;
passing the stream of flue gas upwardly from the first stage;
inhibiting upward movement of the first stream of coked catalyst in the first stage by the first permeable barrier;
passing the second stream of coked catalyst downwardly from the first stage to a second stage below the first stage;
passing a second stream of oxygen-containing gas upwardly through the second stage in counter-current contact with the second stream of coked catalyst to combust coke from the second stream of coked catalyst to provide a third stream of coked catalyst including regenerated catalyst and the first stream of oxygen-containing gas including flue gas;
passing the first stream of oxygen-containing gas from the second stage to the first stage; and
inhibiting upward movement of the second stream of coked catalyst in the second stage via a second permeable barrier.

10. The process of claim 9 further comprising:
passing the third stream of coked catalyst downwardly from the second stage to a third stage below the second stage;
passing a third stream of oxygen-containing gas upwardly through the third stage in counter-current contact with the stream of coked catalyst to combust coke from the coked catalyst to provide a fourth stream of coked catalyst comprising regenerated catalyst and the second stream of oxygen-containing gas including flue gas; and
inhibiting upward movement of the third stream of coked catalyst in the third stage.

11. A process for combusting coke from coked catalyst in a regenerator vessel comprising a separation section and a regeneration section located below the separation section, the process comprising:
providing a coked catalyst to the regeneration section through a catalyst inlet in the regeneration section;
passing the coked catalyst downwardly through a one or more stages, each of the one or more stages comprising a permeable barrier;
passing a primary stream of oxygen-containing gas upwardly through the one or more stages in counter-current contact with the coked catalyst to combust coke from the coked catalyst to provide a partially regenerated catalyst and a flue gas;
passing the partially regenerated catalyst from the regeneration section to a bottom of the regenerator riser;
propelling the partially regenerated catalyst via a secondary stream of oxygen-containing gas to move the regenerated catalyst from the bottom of the regenerator riser to an outlet located in the separation section while combusting coke from the partially regenerated catalyst to provide a completely regenerated catalyst;
discharging the completely regenerated catalyst to the separation section from the outlet of the regenerator riser; and
passing the completely regenerated catalyst from a regenerated catalyst outlet in the separation section to a riser reactor through a regenerated catalyst standpipe.

12. A regenerator vessel for combusting carbonaceous deposits from catalyst comprising:
(a) a regeneration section comprising:
(i) a catalyst inlet for feeding coked catalyst;
(ii) a one or more stages located below the catalyst inlet, each of the one or more stages comprising a permeable barrier comprising openings sized to permit the coked catalyst to pass through downwardly, the permeable barrier extending laterally across the regenerator vessel; and
(ii) a combustion gas distributor for passing a primary stream of oxygen-containing gas upwardly through the one or more stages in counter-current contact with the coked catalyst to combust coke from the coked catalyst to provide a regenerated catalyst and a flue gas;

(b) a regenerator riser comprising:
(i) an inlet in a bottom of the regenerator riser in downstream communication with regeneration section via a regeneration section outlet for receiving the regenerated catalyst; and
(ii) an outlet of the regenerator riser for discharging the regenerated catalyst; and

(c) a separation section above the regeneration section, the separation section comprising:
(i) one or more cyclone separators for separating catalyst from the flue gas;
(ii) a regenerated catalyst outlet;
(iii) the outlet of the regenerator riser; and
(iv) a flue gas outlet in the regenerator vessel.

13. The regenerator vessel of claim 12 , wherein the bottom of the regenerator riser is located below the regeneration section and in is communication via a regenerator riser conduit extending from a regeneration section outlet to the inlet in the bottom of the regenerator riser.

14. The regenerator vessel of claim 12 , wherein the regenerated catalyst outlet is located above the catalyst inlet.

15. The regenerator vessel o

Assignees

• Uop Llc
• Upo Llc

Inventors

• Davydov Lev
• Sandacz Michael S
• Palmas Paolo
• Fei Zhihao
• Lippmann Matthew

Classifications

• B01J2208/00938

  Flow distribution elements · CPC title

• C10G11/182

  Regeneration · CPC title

• F27B15/09

  Arrangements of devices for discharging · CPC title

• B01J38/70

  Wet oxidation of material submerged in liquid · CPC title

• B01J8/1872

  Details of the fluidised bed reactor (B01J8/1836 takes precedence) · CPC title