# US 2020/0399546 A1 · Methods and systems for producing light olefins from naphtha

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- Number: US 2020/0399546 A1
- Document ID: US20200399546A1
- Status: Published application
- Kind: A1
- Application number: 16/767,224
- Filed: 2018-11-15
- Published: 2020-12-24
- Earliest claimed: 2017-12-04
- Assignees: Sabic Global Technologies B.V.
- Applicants: SABIC Global Technologies B.V.
- Inventors: Joris VAN WILLIGENBURG
- Web page: https://patentgrep.com/patent/US20200399546A1

## CPC

- C10G 9/36: with heated gases or vapours
- C10G 47/22: Non-catalytic cracking in the presence of hydrogen
- C10G 1/06: by destructive hydrogenation
- C10G 69/06: including at least one step of thermal cracking in the absence of hydrogen
- C10K 3/04: reducing the carbon monoxide content {, e.g. water-gas shift [WGS]}
- C10G 2300/1044: Heavy gasoline or naphtha having a boiling range of about 100 - 180 °C
- C10G 2400/20: C2-C4 olefins
- C10G 2400/22: Higher olefins
- C10G 2400/30: Aromatics
- 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
- C10K: PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE

## Abstract

Methods and systems for producing olefins from a naphtha feedstock are provided. Methods can include pyrolyzing the naphtha feedstock in the presence of hydrogen gas to produce a first effluent, separating the first effluent into light components, heavy components and one or more olefin product streams, steam cracking the light components to produce a second effluent, and extracting aromatics, if any, from the heavy components to produce a third effluent.

## Claims

### Claim 1

A method for producing olefins and aromatics from a naphtha feedstock, the method comprising the steps of:
(a) pyrolyzing the naphtha feedstock in the presence of hydrogen gas to produce a first effluent comprising first olefins;
(b) separating the first effluent into light components, heavy components, if any, and one or more olefin product streams;
(c) steam cracking the light components to produce a second effluent comprising second olefins; and
(d) extracting aromatics, if any, from the heavy components to produce a third effluent.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first effluent comprises C2 to C4 paraffins and iso-paraffins.

### Claim 3 (depends on 1)

The method of claim 1, wherein after pyrolyzing, the first effluent has a temperature of about 700° C. to about 860° C.

### Claim 4 (depends on 1)

The method of claim 1, wherein after steam cracking, the second effluent has a temperature of about 820° C. to about 880° C.

### Claim 5 (depends on 1)

The method of claim 1, wherein the separating the first effluent comprises compressing the first effluent to pressurize the first effluent and condense the heavy components.

### Claim 6 (depends on 5)

The method of claim 5, further comprising treating the first effluent to remove carbon dioxide and water, if any.

### Claim 7 (depends on 1)

The method of claim 1, further comprising combining the first effluent and the second effluent prior to the separating.

### Claim 8 (depends on 1)

The method of claim 1, further comprising the steps of:
(e) extracting hydrogen, if any, from the light components to produce a hydrocarbon stream and recycling the hydrogen by mixing it with the naphtha feedstock;
(f) extracting methane, if any, from the hydrocarbon stream to produce a C2+ stream;
(g) extracting ethylene and ethane, if any, from the C2+ stream to produce a C3+ stream;
(h) extracting propylene and propane, if any, from the C3+ stream to produce a C4+ stream;
(i) extracting C4 components, if any, from the C4+ stream to produce a C5+ stream; and
(j) extracting benzene, toluene, xylene, ethylbenzene, C9+ aromatics and heavy oil, if any, from the heavy components and the C5+ stream to produce a third effluent.

### Claim 9 (depends on 8)

The method of claim 8, further comprising recycling the third effluent by combining it with the naphtha feedstock.

### Claim 10 (depends on 8)

The method of claim 8, further comprising pyrolyzing the third effluent.

### Claim 11 (depends on 8)

The method of any claim 8, further comprising purifying the hydrogen by removing carbon monoxide and methane, if any.

### Claim 12 (depends on 11)

The method of claim 11, wherein the carbon monoxide is converted to methane and water, wherein the water is removed to produce a hydrogen stream comprising from about 85 vol-% to about 95 vol-% hydrogen.

### Claim 13 (depends on 12)

The method of claim 12, wherein the methane is removed by pressure swing adsorption to produce a purified hydrogen stream comprising greater than about 99 vol-% hydrogen.

### Claim 14 (depends on 8)

The method of claim 8, further comprising recycling the hydrogen by combining it with the naphtha feedstock.

### Claim 15 (depends on 8)

The method of claim 8, further comprising transferring the hydrogen to one or more hydrogenation reactors.

### Claim 16 (depends on 8)

The method of claim 8, further comprising the separating the ethylene and ethane into an ethylene product stream and an ethane stream.

### Claim 17 (depends on 8)

The method of claim 8, further comprising separating the propylene and propane into a propylene product stream and a propane stream.

### Claim 18 (depends on 8)

The method of claim 8, further comprising steam cracking the ethane stream and the propane stream.

### Claim 19 (depends on 8)

The method of claim 8, further comprising the steps of:
(k) extracting C4 and lighter hydrocarbons, if any, from the heavy components and the C5+ stream to produce a C4− stream; and
(l) recycling the C4− stream by combining it with the first effluent and/or the second effluent.

### Claim 20

A method for producing olefins and aromatics from a naphtha feedstock, the method consisting of the steps of:
(a) pyrolyzing the naphtha feedstock in the presence of hydrogen gas to produce a first effluent comprising first olefins;
(b) separating the first effluent into light components and heavy components and an olefin product streams, wherein the heavy components comprise aromatics;
(c) steam cracking the light components to produce a second effluent comprising second olefins; and
(d) extracting aromatics from the heavy components to produce a third effluent, wherein the yield sum of the ethylene and the propylene is greater than about 51%.