# US 7,744,744 B1 · Converted FCC bubbling bed regenerator

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- Number: US 7,744,744 B1
- Document ID: US7744744B1
- Status: Granted
- Kind: B1
- Application number: 11/322,755
- Filed: 2005-12-30
- Granted: 2010-06-29
- Earliest claimed: 2005-12-30
- Assignees: Uop LLC
- Inventors: Paolo Palmas; Frank S. Rosser, Jr.; Patrick D. Walker
- Web page: https://patentgrep.com/patent/US7744744B1

## CPC

- C10G 11/182: {Regeneration}
- B01J 38/36: and with substantially complete oxidation of carbon monoxide to carbon dioxide within regeneration zone
- B01J 29/06: Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 37/04: Mixing {(B01J37/0009, B01J37/0018 take precedence)}
- 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
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

An apparatus and process for regenerating cracking catalyst may include a regenerator, a distributor penetrating the bottom of the regenerator, a spent catalyst conduit, a return standpipe, and a recirculating standpipe, wherein the return standpipe and the recirculating standpipe are connected to the upper half of the regenerator. An apparatus for regenerating cracking catalyst may include a spent catalyst standpipe and a recirculation standpipe positioned on an inner side of the regenerator vessel.

## Claims

### Claim 1

A fluidized catalytic cracking process, comprising:
cracking hydrocarbon feed in a riser with regenerated catalyst to form cracked stream and spent catalyst;
combining said regenerated catalyst, and said spent catalyst into a mixture in a mixing zone;
adding lift gas to the mixing zone;
transporting said mixture upwardly into a regenerator vessel having a dense bed;
adding combustion gas to the regenerator vessel, said combustion gas being the majority of the gas added to the process;
regenerating said spent catalyst into said regenerated catalyst in said dense bed;
withdrawing regenerated catalyst from near a top half of said dense bed;
returning a first portion of said regenerated catalyst into said riser; and
recirculating a second portion of said regenerated catalyst to said mixing zone.

### Claim 2 (depends on 1)

The process according to claim 1, wherein said combining step comprises mixing said combustion gas, said regenerated catalyst, and said spent catalyst in a distributor below said regenerator vessel.

### Claim 3 (depends on 1)

The process according to claim 1, wherein said withdrawing step comprises withdrawing regenerated catalyst from a top third of said dense bed.

### Claim 4 (depends on 1)

The process according to claim 1, wherein said returning step further comprises fluidizing said first portion.

### Claim 5 (depends on 1)

The process according to claim 1, wherein said first portion is smaller than said second portion.

### Claim 6 (depends on 5)

The process according to claim 5, wherein said second portion is between 100 wt-% and about 300 wt-% greater than said first portion.

### Claim 7 (depends on 1)

The process according to claim 1, wherein said transporting step comprises adding lift gas into a distributor.

### Claim 8 (depends on 7)

The process according to claim 7, wherein said regenerating step comprises adding combustion gas to said dense bed.

### Claim 9 (depends on 8)

The process according to claim 8, wherein said lift gas comprises between about 10 wt-% and about 30 wt-% of said combustion gas.

### Claim 10

An apparatus for regenerating cracking catalyst, comprising:
a regenerator vessel having a bottom and a side, wherein said side has an upper half;
a distributor penetrating through said bottom;
a spent catalyst conduit flowably connected to said distributor;
a return standpipe flowably connected to said upper half; and
a recirculating standpipe flowably connected between a bottom of said upper half and said distributor.

### Claim 11 (depends on 10)

The apparatus according to claim 10, further comprising combustion gas distributors penetrating said bottom, said combustion gas distributors having combustion gas inlets.

### Claim 12 (depends on 11)

The apparatus according to claim 11, wherein said distributor has a distributor inlet and said combustion gas inlets are located higher than said distributor inlet.

### Claim 13 (depends on 10)

The apparatus according to claim 10, wherein said return standpipe further comprises a fluidizing gas source.

### Claim 14 (depends on 10)

The apparatus according to claim 10, wherein said distributor further comprises a lift gas inlet.

### Claim 15 (depends on 10)

The apparatus according to claim 10, wherein said return standpipe and said recirculating standpipe each have a diameter, and wherein said return standpipe diameter is greater than said recirculating standpipe diameter.

### Claim 16

An apparatus for regenerating cracking catalyst, comprising:
a regenerator vessel having a bottom and a side and a dense bed of catalyst in said vessel;
a distributor penetrating through said bottom and in fluid communication with said regenerator vessel;
a spent catalyst conduit with an outlet in fluid communication with said distributor;
a return standpipe with an inlet in fluid communication with said regenerator vessel in the top third of said dense bed of catalyst; and
a recirculating standpipe with an outlet in fluid communication with said distributor.

### Claim 17 (depends on 16)

The apparatus according to claim 16, further comprising combustion gas distributors penetrating said bottom, said combustion gas distributors having combustion gas inlets.

### Claim 18 (depends on 17)

The apparatus according to claim 17, wherein said distributor has a distributor inlet and said combustion gas inlets are located higher than said distributor inlet.

### Claim 19 (depends on 16)

The apparatus according to claim 16, wherein said distributor further comprises a lift gas inlet.

### Claim 20 (depends on 16)

The apparatus according to claim 16, wherein said return standpipe and said recirculating standpipe each have a diameter, and wherein said return standpipe diameter is greater than said recirculating standpipe diameter.

### Claim 21

An apparatus for regenerating cracking catalyst, comprising:
a generally cylindrical regenerator vessel having a lower portion, with an inner side, a bottom and a dense bed of catalyst contained therein;
a distributor penetrating through said bottom and in fluid communication with said regenerator vessel;
a spent catalyst standpipe positioned on said inner side and in fluid communication with said distributor;
a recirculation standpipe positioned on said inner side and in fluid communication with said distributor;
a spent catalyst conduit in fluid communication with said regenerator vessel; and
a return catalyst conduit penetrating said lower portion and in fluid communication with said regenerator vessel.

### Claim 22 (depends on 21)

The apparatus for regenerating cracking catalyst according to claim 21, further comprising a spent catalyst hopper in fluid communication with said spent catalyst standpipe, wherein said spent catalyst conduit is in fluid communication with said spent catalyst hopper.

### Claim 23 (depends on 21)

The apparatus for regenerating cracking catalyst according to claim 21, further comprising a recirculation hopper in fluid communication with said recirculation standpipe.

### Claim 24 (depends on 21)

The apparatus for regenerating cracking catalyst according to claim 21, further comprising a return catalyst hopper in fluid communication with said return catalyst conduit.

### Claim 25 (depends on 21)

The apparatus for regenerating cracking catalyst according to claim 21, wherein said spent catalyst hopper is positioned in a first location and said recirculation hopper is positioned in a second location, and wherein said first location and said second location are diametrically opposite in said regenerator vessel.

### Claim 26 (depends on 21)

The apparatus for regenerating cracking catalyst according to claim 21, further comprising an air distributor below and in fluid communication with said distributor.