Method for preparing synthesis gas and aromatic hydrocarbon

Patent metadata

Field	Value
Publication number	US-12559367-B2
Application number	US-202117799909-A
Country	US
Kind code	B2
Filing date	Dec 11, 2021
Priority date	Jun 24, 2021
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

Provided is a method for preparing synthesis gas and aromatic hydrocarbons, and more particularly, a method for preparing synthesis gas and aromatic hydrocarbons including: supplying a pyrolysis fuel oil (PFO) stream containing PFO and a pyrolysis gas oil (PGO) stream containing PGO to a distillation tower as a feed stream (S 10 ), the PFO stream and the PGO stream being discharged in a naphtha cracking center (NCC) process; and supplying a lower discharge stream from the distillation tower to a combustion chamber for a gasification process and supplying an upper discharge stream from the distillation tower to a BTX preparation process (S 20 ).

First claim

The invention claimed is:

1 . A method for preparing synthesis gas and aromatic hydrocarbons, the method comprising:
supplying a pyrolysis fuel oil (PFO) stream containing PFO and a pyrolysis gas oil (PGO) stream containing PGO to a distillation tower as a feed stream (S 10 ), the PFO stream and the PGO stream being discharged from a naphtha cracking center (NCC) process; and supplying a lower discharge stream from the distillation tower to a combustion chamber for a gasification process to obtain synthesis gas and supplying an upper discharge stream from the distillation tower to a preparation process of one or more of benzene, toluene, and xylene (BTX preparation process) to obtain aromatic hydrocarbons (S 20 ), wherein a ratio of a flow rate of the upper discharge stream from the distillation tower to a flow rate of the feed stream to be supplied to the distillation tower is 0.01 to 0.2.

2 . The method of claim 1 , wherein a kinematic viscosity of the lower discharge stream from the distillation tower at the time of supply to the combustion chamber is 300 cSt or less, and
wherein a flash point of the lower discharge stream from the distillation tower is higher than a temperature of the lower discharge stream from the distillation tower at the time of supply to the combustion chamber by 25° C. or more.

3 . The method of claim 1 , wherein a temperature of the lower discharge stream from the distillation tower at the time of supply to the combustion chamber is 20° C. to 90° C.

4 . The method of claim 1 , wherein the lower discharge stream from the distillation tower passes through a heat exchanger before being supplied to the combustion chamber.

5 . The method of claim 1 , wherein the PGO stream contains 70 wt % or more of hydrocarbons having 10-12 carbon atoms, and
wherein the PFO stream contains 70 wt % or more of hydrocarbons having 13 or more carbon atoms.

6 . The method of claim 1 , wherein a flash point of the PGO stream is 10 to 50° C., and
wherein a flash point of the PFO stream is 70 to 200° C.

7 . The method of claim 1 , wherein a kinematic viscosity of the PGO stream at 40° C. is 1 to 200 cSt, and
wherein a kinematic viscosity of the PFO stream at 40° C. is 400 to 100,000 cSt.

8 . The method of claim 1 , wherein a raw pyrolysis gasoline (RPG) stream containing RPG discharged from the naphtha cracking center (NCC) process is supplied to the BTX preparation process.

9 . The method of claim 1 , wherein the PGO stream is a lower discharge stream discharged from a lower portion of a first stripper after supplying a side discharge stream discharged from a side portion of a gasoline fractionator in the naphtha cracking center (NCC) process to the first stripper, and
wherein the PFO stream is a lower discharge stream discharged from a lower portion of a second stripper after supplying a lower discharge stream discharged from a lower portion of the gasoline fractionator in the naphtha cracking center (NCC) process to the second stripper.

10 . The method of claim 9 , wherein the lower discharge stream from the gasoline fractionator is discharged at a stage of 90% or more of a total number of stages of the gasoline fractionator, and
wherein the side discharge stream from the gasoline fractionator is discharged at a stage of 10% to 70% of the total number of stages of the gasoline fractionator.

11 . The method of claim 1 , wherein a reflux ratio of the distillation tower is 0.01 to 10.

Assignees

• Lg Chemical Ltd

Inventors

• Hwang Sung June
• Kim Tae Woo
• Ki Sik
• Lee Sung Kyu

Classifications

• C10G2400/30

  Aromatics · CPC title

• C10G2300/4006

  Temperature · CPC title

• C10G2300/1037

  Hydrocarbon fractions · CPC title

• C10G7/08

  Azeotropic or extractive distillation (refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents C10G21/00) · CPC title

• C01B2203/169

  Controlling the feed · CPC title