# US 10,308,567 B2 · Processes and systems for obtaining aromatics from catalytic cracking hydrocarbons

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- Number: US 10,308,567 B2
- Document ID: US10308567B2
- Status: Granted
- Kind: B2
- Application number: 13/830,189
- Filed: 2013-03-14
- Published: 2014-04-10
- Granted: 2019-06-04
- Earliest claimed: 2012-10-10
- Assignees: GTC Technology US LLC
- Applicants: GTC Technology US LLC
- Inventors: Weihua Jin; Zhongyi Ding; Mircea Cretoiu; Joseph C. Gentry; Mark Lockhart; Calambur Shyamkumar; Pinti Wang
- Web page: https://patentgrep.com/patent/US10308567B2

## CPC

- C07C 5/2729: {Changing the branching point of an open chain or the point of substitution on a ring}
- C07C 2/76: by condensation of hydrocarbons with partial elimination of hydrogen
- C07C 5/2732: {Catalytic processes}
- C10G 11/18: according to the "fluidised-bed" technique
- C10G 35/04: Catalytic reforming
- C10G 55/06: including at least one catalytic cracking step
- C10G 2300/1074: Vacuum distillates
- C10G 2300/1077: Vacuum residues
- Y02P 20/52: using catalysts, e.g. selective catalysts
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Methods and processes for producing paraxylene from catalytic cracking hydrocarbons, particularly C4 and C5+ streams, are disclosed. Each of the processing steps may be tailored to the overall objective of high paraxylene yield from a relative inexpensive feedstock.

## Claims

### Claim 1

A process for producing paraxylene from a C4 stream and a C5+ catalytic naphtha stream from catalytic cracking unit, said process comprising:
a) separating, in a first separation section, a C5-C9 non-aromatics stream and a first C6-C10 aromatics stream from the C5+ catalytic naphtha stream;
b) forming, in an aromatization section, a second C6-C10 aromatics stream from the C4 stream, the C5-C9 non-aromatics stream, and an olefin rich feedstock;
c) removing, via an impurity removal section, impurities from the first and second C6-C10 aromatics streams to create a purified C6-C10 aromatics stream;
d) providing a reformate and pygas feedstock to a second separation section;
e) separating, in the second separation section, a C6-C7 stream, a first C8 stream, a C9-C10 stream, a C11+ stream, and non-aromatics from the C6-C7 stream and the first C8 stream from the purified C6-C10 aromatics streams and the reformate and pygas feedstock;
f) feeding the C6-C7 stream and the C9-C10 stream into a xylene formation section to form a second C8 stream; and
g) feeding the first and second C8 streams into a paraxylene production section to produce a high-purity paraxylene product, the paraxylene production section comprising a paraxylene recovery zone and a xylene isomerization zone; and
wherein the second separation section comprises a distillation zone that includes a benzene column and a toluene column, and wherein the xylene formation section of step f) shares the benzene column and the toluene column of the second separation section.

### Claim 2 (depends on 1)

The process of claim 1, wherein step a) includes a distillation step and an extraction step.

### Claim 3 (depends on 2)

The process of claim 2, wherein said extraction step is carried out by using extractive distillation method or liquid-liquid extraction method.

### Claim 4 (depends on 1)

The process of claim 1, wherein step b) is carried out in a single reactor or multiple reactors that are fixed bed reactors or continuous regeneration (CCR) type reactor systems.

### Claim 5 (depends on 1)

The process of claim 1, wherein said C5-C9 non-aromatics in step b) contains 15-85 wt % olefins.

### Claim 6 (depends on 1)

The process of claim 1, wherein the removing of impurities in step c) is carried out using hydrogenation, adsorption, absorption, or solvent extraction, or a combination thereof.

### Claim 7 (depends on 1)

The process of claim 1, wherein step e) includes a distillation step and an extraction step.

### Claim 8 (depends on 7)

The process of claim 7, wherein said extraction step is carried out by using an extractive distillation or liquid-liquid extraction.

### Claim 9 (depends on 1)

The process of claim 1, wherein xylene isomerization uses an EB-isomerization catalyst or an EB-dealkylation catalyst.

### Claim 10 (depends on 1)

The process of claim 1, wherein the paraxylene recovery zone comprises crystallization and adsorption.

### Claim 11

A process for producing paraxylene from a C4 stream and a C5+ naphtha stream from catalytic cracking unit, said process comprising:
a) separating a feed stream into C4+ and C5-C10+ streams;
b) distilling a C5-C9 non-aromatics stream and a C6-C10 aromatics stream from the C5-C10+ stream;
c) feeding the C4+ stream, the C5-C9 non-aromatics stream, and a feed stream rich in olefins into a reactor to form aromatics from the C4+ stream and the C5-C9 non-aromatics stream;
d) feeding an output stream from the reactor and the C6-C10 aromatics stream to an impurity removal section to remove impurities from the output stream and the C6-C10 aromatics stream;
e) providing a reformate and pygas feedstock to a separation section;
f) feeding an output stream from the impurities removal section into the separation section to separate the output stream and the reformate and pygas feedstock into a C6-C7 stream, a first C8 stream, a C9-C10 stream, a C11+ stream, and non-aromatics from the C6-C7 stream and the first C8 stream; and
g) feeding the C6-C7 and the C9-C10 stream into a xylene formation section to form a second C8 stream; and
h) feeding the first and second C8 streams into a paraxylene production section to produce paraxylene, the paraxylene production section comprising a paraxylene recovery zone and a xylene isomerization zone; and
wherein the separation section comprises a distillation zone that includes a benzene column and a toluene column, and wherein the xylene formation section of step g) shares the benzene column and the toluene column of the separation section.

### Claim 12 (depends on 11)

The process of claim 11, wherein step c) is carried out in a single reactor or multiple reactors that are fixed bed reactors or continuous regeneration (CCR) type reactor systems.

### Claim 13 (depends on 11)

The process of claim 11, wherein said C5-C9 non-aromatics in step b) contains 15-85 wt % olefins.

### Claim 14 (depends on 11)

The process of claim 11, wherein the removing of impurities in step d) is carried out using hydrogenation, adsorption, absorption, or solvent extraction, or a combination thereof.

### Claim 15 (depends on 11)

The process of claim 11, wherein the separation section comprises a distillation step and an extraction step.

### Claim 16 (depends on 15)

The process of claim 15, wherein said extraction step is carried out by using an extractive distillation method or a liquid-liquid extraction.

### Claim 17 (depends on 11)

The process of claim 11, wherein paraxylene recovery is carried out by using crystallization or adsorption or a combination thereof.

### Claim 18 (depends on 11)

The process of claim 11, wherein xylene isomerization uses an EB-isomerization catalyst or an EB-dealkylation catalyst.

### Claim 19 (depends on 11)

The process of claim 11, wherein the production of xylenes uses benzene methylation, toluene methylation, benzene/toluene methylation, benzene/C9-C10 transalkylation, toluene/C9-C10 transalkylation, benzene/toluene/C9-C10 transalkylation, toluene disproportionation (TDP), selective toluene disproportionation (STDP) or a combination thereof.

### Claim 20 (depends on 11)

The process of claim 11, wherein the paraxylene recovery zone comprises crystallization and adsorption.