# US 12,767,893 B2 · Method for producing raw material of naphtha cracking center

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- Number: US 12,767,893 B2
- Document ID: US12767893B2
- Status: Granted
- Kind: B2
- Application number: 18/853,086
- Filed: 2024-01-03
- Published: 2025-07-03
- Granted: 2026-10-20
- Earliest claimed: 2023-01-27
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Sung Ho Lee; Sang Beom Lee; Jun Kyo Jeong
- Web page: https://patentgrep.com/patent/US12767893B2

## CPC

- C10G 1/02: by distillation
- C10B 53/07: {of solid raw materials consisting} of synthetic polymeric materials, e.g. tyres (recovery or working-up of waste materials of organic macromolecular compounds or compositions based thereon by dry-heat treatment for obtaining partially depolymerised materials C08J11/10; production of liquid hydrocarbon mixtures from rubber or rubber waste C10G1/10)
- C10B 57/06: containing additives
- C10G 2300/1003: Waste materials
- C10G 2400/02: Gasoline
- C10G 2400/04: Diesel oil
- 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
- C10B: DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS (cracking oils C10G; underground gasification of minerals E21B43/295)

## Abstract

A method for producing a raw material of a naphtha cracking process, the method including: preparing a pyrolysis composition including a polyolefin or a blend including the polyolefin and a hydrogen donor; and pyrolyzing the pyrolysis composition to obtain pyrolysis products. The method results in an increase in the amount of gasoline included in the pyrolysis product, while significantly decreasing the amount of a heavy hydrocarbon having 23 or more carbon atoms, which is not appropriate as the raw material of a naphtha cracking center. Thus, a yield of the pyrolysis fraction can be further increased while obtaining a high-quality pyrolysis fraction.

## Claims

### Claim 1

A method for producing a raw material of a naphtha cracking center, comprising:
preparing a pyrolysis composition including a polyolefin and a hydrogen donor; and
pyrolyzing the pyrolysis composition to obtain a pyrolysis product,
wherein the hydrogen donor includes one or more of formic acid, benzoic acid, ethylene glycol, and phenol,
wherein an amount of the hydrogen donor in the pyrolysis composition is 5 to 20 wt %.

### Claim 2 (depends on 1)

The method of claim 1, further comprising separating a heavy hydrocarbon compound having 23 or more carbon atoms from the pyrolysis product to obtain a pyrolysis fraction.

### Claim 3 (depends on 1)

The method of claim 1, wherein the polyolefin includes one or more of polyethylene and polypropylene.

### Claim 4 (depends on 1)

The method of claim 1, wherein the pyrolysis is performed at a temperature of 380 to 520° C.

### Claim 5 (depends on 1)

The method of claim 1,
wherein the pyrolysis product includes gasoline, diesel, and a heavy hydrocarbon compound having 23 or more carbon atoms, and
an amount of the gasoline, the diesel, and the heavy hydrocarbon compound having 23 or more carbon atoms in the pyrolysis product is 50 to 90 wt %.

### Claim 6 (depends on 5)

The method of claim 5, wherein the gasoline is a mixture including 95 wt % or more of a hydrocarbon compound having 5 to 12 carbon atoms.

### Claim 7 (depends on 5)

The method of claim 5,
wherein a gas chromatography area of the gasoline included in the pyrolysis product is 65 to 90% with respect to a total of 100% of gas chromatography areas of the gasoline, the diesel, and the heavy hydrocarbon compound having 23 or more carbon atoms included in the pyrolysis product, and
the gas chromatography area is measured from a gas chromatography graph obtained by gas chromatography analysis.

### Claim 8 (depends on 2)

The method of claim 2, wherein the pyrolysis fraction is a raw material feed of the naphtha cracking center.