# US 7,745,365 B2 · Bathtub-type spent catalyst distributor for effective counter-current regeneration in fluid catalytic cracking units

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- Number: US 7,745,365 B2
- Document ID: US7745365B2
- Status: Granted
- Kind: B2
- Application number: 11/716,350
- Filed: 2007-03-09
- Published: 2008-09-11
- Granted: 2010-06-29
- Earliest claimed: 2007-03-09
- Assignees: Stone & Webster Process Technology, Inc.
- Inventors: Chris Santner; Eusebius Gbordzoe; Harvey McQuiston
- Web page: https://patentgrep.com/patent/US7745365B2

## CPC

- B01J 8/26: with two or more fluidised beds, e.g. reactor and regeneration installations
- B01J 8/004: {by means of a nozzle}
- B01J 38/30: in gaseous suspension, e.g. fluidised bed
- C10G 11/182: {Regeneration}
- B01J 2208/00752: Feeding
- C10G 2300/70: Catalyst aspects
- Y10T 137/85938: Non-valved flow dividers
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An improved spent catalyst regenerator which contains sub-troughs branching off from the main trough, distribution troughs which extend outward from the sides of the main trough and the sub-troughs, and downflow tubes extending downward from the bottom of the main trough and sub-troughs.

## Claims

### Claim 1

A method of distributing spent catalyst in a spent catalyst regenerator for a fluidized catalytic cracking unit comprising the steps of:
a. collecting spent catalyst in a substantially elongated main trough and, optionally, fluidizing and/or aerating said spent catalyst;
b. passing a percentage of said spent catalyst from said main trough to a plurality of sub-troughs; and
c. feeding said spent catalyst from said plurality of sub-troughs and from said main trough to a catalyst bed surface,
wherein said spent catalyst is fed from said main trough and said plurality of sub-troughs to said catalyst surface bed via a plurality of cutouts located on the walls of said main trough and said plurality of sub-troughs.

### Claim 2 (depends on 1)

The method of claim 1 wherein said spent catalyst is fed from said main trough and said plurality of sub-troughs to said catalyst surface bed via a plurality of distribution troughs located on the sides of said main trough and said plurality of sub-troughs.

### Claim 3 (depends on 2)

The method of claim 2 wherein at least one of said plurality of distribution troughs is angled downward.

### Claim 4 (depends on 1)

The method of claim 1 wherein a plurality of downflow tubes are connected to the bottom of said main trough, and further comprising the steps of
a. passing some of said spent catalyst to said plurality of downflow tubes; and
b. feeding said spent catalyst in said plurality of downflow tubes to said catalyst bed surface.

### Claim 5 (depends on 4)

The method of claim 4 wherein at least one of said plurality of downflow tubes extends below said surface of said catalyst bed and said spent catalyst is deposited below said surface of said catalyst bed.

### Claim 6 (depends on 5)

The method of claim 5 wherein at least one of said plurality of downflow tubes extends below said surface of said catalyst bed and into the upper part of said catalyst bed, and said spent catalyst is deposited into the upper part of said catalyst bed.

### Claim 7 (depends on 2)

The method of claim 2 wherein a plurality of downflow tubes are connected to the bottom of at least one selected from the group consisting of said main trough and said plurality of sub-troughs, and further comprising the steps of:
a. passing some of said spent catalyst to said plurality of downflow tubes; and
b. feeding said spent catalyst in said plurality of downflow tubes to said catalyst bed surface.

### Claim 8 (depends on 7)

The method of claim 7 wherein at least one of said downflow tubes extends below said surface of said catalyst bed and said spent catalyst is deposited below said surface of said catalyst bed.

### Claim 9 (depends on 8)

The method of claim 8 wherein at least one of said downflow tubes extends below said surface of said catalyst bed and into the upper part of said catalyst bed, and said spent catalyst is deposited into the upper part of said catalyst bed.

### Claim 10 (depends on 2)

The method of claim 2 wherein at least one of said plurality of distribution troughs is angled downward.

### Claim 11

A method of distributing spent catalyst in a spent catalyst regenerator for a fluidized catalytic cracking unit comprising the steps of:
a. collecting spent catalyst in a substantially elongated main trough and, optionally, fluidizing and/or aerating said spent catalyst;
b. passing a percentage of said spent catalyst from said main trough to a plurality of downflow tubes located on the bottom of said main trough;
c. feeding said spent catalyst remaining in said main trough to a catalyst bed surface via at least one selected from the group consisting of a plurality of cutouts located along the walls of said main trough and a plurality of distribution troughs located on the sides of said main trough; and
d. feeding said spent catalyst in said plurality of downflow tubes to said catalyst bed surface.

### Claim 12 (depends on 11)

The method of claim 11 wherein at least one of said plurality of distribution troughs is angled downward.

### Claim 13 (depends on 11)

The method of claim 11 wherein at least one of said plurality of downflow tubes extends below said surface of said catalyst bed and said spent catalyst is deposited below said surface of said catalyst bed.

### Claim 14 (depends on 13)

The method of claim 13 wherein at least one of said plurality of downflow tubes extends below said surface of said catalyst bed and into the upper part of said catalyst bed, and said spent catalyst is deposited into the upper part of said catalyst bed.