# US 11,078,435 B2 · Process for cracking an olefinic feed comprising diolefins and monoolefins

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- Number: US 11,078,435 B2
- Document ID: US11078435B2
- Status: Granted
- Kind: B2
- Application number: 16/403,592
- Filed: 2019-05-05
- Published: 2020-11-05
- Granted: 2021-08-03
- Earliest claimed: 2019-05-05
- Assignees: Uop LLC
- Applicants: Uop LLC
- Inventors: John J. Senetar; Christopher R. Schindlbeck
- Web page: https://patentgrep.com/patent/US11078435B2

## CPC

- C10G 69/08: including at least one step of reforming naphtha
- C07C 4/06: Catalytic processes {(C07C4/025 takes precedence)}
- C07C 5/05: Partial hydrogenation
- C10G 2300/1088: Olefins
- C10G 2400/20: C2-C4 olefins
- 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
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A process for cracking an olefinic feed comprising diolefins and monoolefins is provided. The process comprises selectively hydrogenating the olefinic feed in a hydrogenation reactor to convert the diolefins to monoolefins to provide a hydrogenated effluent stream. The hydrogenated effluent stream is vaporized to provide a vaporized hydrogenated effluent stream. The vaporized hydrogenated effluent stream is passed to an olefin cracking reactor to provide a cracked olefin stream comprising C2 and C3 olefins. The cracked olefin stream is passed to a recycle column to provide one of an overhead vapor stream comprising C5− hydrocarbons or a side draw vapor stream comprising C6+. At least a portion of the overhead vapor stream or the side draw vapor stream is recycled to the olefin cracking reactor.

## Claims

### Claim 1

A process for cracking an olefinic feed comprising diolefins and monoolefins, the process comprising:
a) selectively hydrogenating the olefinic feed in a hydrogenation reactor to convert diolefins to monoolefins and provide a hydrogenated effluent stream;
b) vaporizing the hydrogenated effluent stream in a vaporizer to provide a vaporized hydrogenated effluent stream;
c) passing the vaporized hydrogenated effluent stream to an olefin cracking reactor to provide a cracked olefin stream comprising C2 and C3 olefins;
d) passing the cracked olefin stream to a recycle column to provide an overhead vapor stream; wherein said overhead vapor stream comprises C5− hydrocarbons or said recycle column provides a side draw vapor stream comprising C6+ hydrocarbons;
e) passing a portion of the overhead vapor stream to a depropanizer column to provide C2 and C3 olefins; and
f) recycling a remaining portion of the overhead vapor stream or the side draw vapor stream to the olefin cracking reactor.

### Claim 2 (depends on 1)

The process of claim 1, wherein the recycling step comprises:
combining the remaining portion of the overhead vapor stream or the side draw vapor stream with the vaporized hydrogenated effluent stream to provide a combined vaporized stream; and
passing the combined vaporized stream to the olefin cracking reactor.

### Claim 3 (depends on 1)

The process of claim 1, wherein the recycling step comprises passing the remaining portion of the overhead vapor stream or the side draw vapor stream to the vaporizer along with the hydrogenated effluent stream.

### Claim 4 (depends on 1)

The process of claim 1 further comprising:
passing the cracked olefin stream comprising C2 and C3 olefins to a compressor to provide a compressed cracked olefin stream; and
passing at least a portion of the compressed cracked olefin stream to the recycle column.

### Claim 5 (depends on 4)

The process of claim 4 further comprising passing a remaining portion of the compressed cracked olefin stream to the depropanizer column to provide C2 and C3 olefins.

### Claim 6 (depends on 1)

The process of claim 1 further comprising separating a bottoms liquid stream from the depropanizer column.

### Claim 7 (depends on 6)

The process of claim 6, wherein the bottoms liquid stream comprises C4+ hydrocarbons.

### Claim 8 (depends on 6)

The process of claim 6, wherein the bottoms liquid stream comprises C6+ hydrocarbons.

### Claim 9 (depends on 6)

The process of claim 6 further comprising recycling at least a portion of the bottoms liquid stream to the hydrogenation reactor at a combined feed ratio from about 1:1 to about 5:1.

### Claim 10 (depends on 1)

The process of claim 1 further comprising heating the vaporized hydrogenated effluent stream to a predetermined temperature prior to passing the vaporized hydrogenated effluent stream to the olefin cracking reactor.

### Claim 11 (depends on 1)

The process of claim 1 further comprising at least one of:
sensing at least one parameter of the process for cracking an olefinic feed comprising diolefins and monoolefins and generating a signal or data from the sensing;
generating and transmitting a signal; or
generating and transmitting data.

### Claim 12

A process for cracking an olefinic feed comprising diolefins and monoolefins, the process comprising:
a) selectively hydrogenating the olefinic feed in a hydrogenation reactor to convert diolefins to monoolefins and provide a hydrogenated effluent stream;
b) vaporizing the hydrogenated effluent stream in a vaporizer to provide a vaporized hydrogenated effluent stream;
c) passing the vaporized hydrogenated effluent stream to an olefin cracking reactor to provide a cracked olefin stream comprising C2 and C3 olefins;
d) passing the cracked olefin stream to a recycle column to provide a first vapor stream comprising C6+ hydrocarbons, and a second vapor stream comprising C5− hydrocarbons; and
e) recycling the first vapor stream to the olefin cracking reactor; and
f) passing the second vapor stream to a depropanizer column to provide C2 and C3 olefins.

### Claim 13 (depends on 12)

The process of claim 12 further comprising withdrawing the first vapor stream comprising C6+ hydrocarbons as a side draw stream from the recycle column.

### Claim 14

A process for cracking an olefinic feed comprising diolefins and monoolefins, the process comprising:
a) selectively hydrogenating the olefinic feed in a hydrogenation reactor to convert diolefins to monoolefins and provide a hydrogenated effluent stream;
b) vaporizing the hydrogenated effluent stream in a vaporizer to provide a vaporized hydrogenated effluent stream;
c) passing the vaporized hydrogenated effluent stream to an olefin cracking reactor to provide a cracked olefin stream comprising C2 and C3 olefins;
d) passing the cracked olefin stream to a recycle column to provide an overhead vapor stream comprising C5− hydrocarbons and a bottoms liquid stream comprising C6+ hydrocarbons;
e) passing a portion of the overhead vapor stream to a depropanizer column to provide C2 and C3 olefins; and
f) recycling a remaining portion of the overhead vapor stream to the olefin cracking reactor.

### Claim 15 (depends on 14)

The process of claim 14, wherein the recycling step comprises:
passing the overhead vapor stream to an overhead receiver of the recycle column to provide an overhead receiver vapor stream, and an overhead receiver liquid stream;
combining a portion of the overhead receiver vapor stream with the hydrogenated effluent stream; and
passing a portion of the overhead receiver liquid stream and a remaining portion of the overhead receiver vapor stream to the depropanizer column to provide C2 and C3 olefins.

### Claim 16 (depends on 14)

The process of claim 14 further comprising:
passing the cracked olefin stream to a compressor to provide a compressed cracked olefin stream;
passing at least a portion of the compressed cracked olefin stream to the recycle column; and
passing a remaining portion of the compressed cracked olefin stream to the depropanizer column to provide C2 and C3 olefins.

### Claim 17 (depends on 14)

The process of claim 14 further comprising separating a bottoms liquid stream comprising C4+ from the depropanizer column.

### Claim 18 (depends on 17)

The process of claim 17 further comprising recycling at least a portion of the bottoms liquid stream to the hydrogenation reactor at a combined feed ratio from about 1:1 to about 5:1.