Refining method of waste plastic pyrolysis oil using sulfur source and molybdenum-based hydrogenation catalyst, and continuous operation method thereof

Patent metadata

Field	Value
Publication number	US-2025019599-A1
Application number	US-202218708596-A
Country	US
Kind code	A1
Filing date	Nov 16, 2022
Priority date	Nov 16, 2021
Publication date	Jan 16, 2025
Grant date	—

Abstract

Provided is a refining method of a waste plastic pyrolysis oil including: (S1) mixing a waste plastic pyrolysis oil and a sulfur source to prepare a mixed oil fraction; (S2) hydrotreating the mixed oil fraction with a reaction gas including a hydrogen gas (H 2 ) in the presence of a molybdenum-based hydrogenation catalyst; and (S3) removing by-products of the hydrotreating from the product of (S2) to obtain a refined oil.

First claim

1 . A refining method of a waste plastic pyrolysis oil, the method comprising:
(S1) mixing a waste plastic pyrolysis oil and a sulfur source to prepare a mixed oil fraction; (S2) hydrotreating the mixed oil fraction with a reaction gas including a hydrogen gas (H 2 ) in the presence of a molybdenum-based hydrogenation catalyst; and (S3) removing by-products of the hydrotreating from a product of (S2) to obtain a refined oil.

2 . The refining method of a waste plastic pyrolysis oil of claim 1 , wherein the sulfur source includes a sulfur-containing oil fraction.

3 . The refining method of a waste plastic pyrolysis oil of claim 1 , wherein the mixed oil fraction includes 100 ppm or more of sulfur.

4 . The refining method of a waste plastic pyrolysis oil of claim 2 , wherein the sulfur-containing oil fraction is included at less than 100 parts by weight based on 100 parts by weight of the waste plastic pyrolysis oil.

5 . The refining method of a waste plastic pyrolysis oil of claim 2 , wherein the sulfur-containing oil fraction is included at less than 50 parts by weight based on 100 parts by weight of the waste plastic pyrolysis oil.

6 . The refining method of a waste plastic pyrolysis oil of claim 1 , wherein the sulfur source includes one or two or more sulfur-containing organic compounds selected from disulfide-based compounds, sulfide-based compounds, sulfonate-based compounds, and sulfate-based compounds.

7 . The refining method of a waste plastic pyrolysis oil of claim 1 , wherein the reaction gas of (S2) includes a hydrogen sulfide gas (H 2 S).

8 . The refining method of a waste plastic pyrolysis oil of claim 7 , wherein the hydrogen sulfide gas (H 2 S) is separated from the by-products of the hydrotreating which has been removed in (S3) and then supplied again.

9 . The refining method of a waste plastic pyrolysis oil of claim 1 , wherein the molybdenum-based hydrogenation catalyst is a catalyst in which a molybdenum-based metal, or a metal including any one or two or more selected from nickel, cobalt, and tungsten and a molybdenum-based metal are supported on a support.

10 . The refining method of a waste plastic pyrolysis oil of claim 1 , wherein the molybdenum-based hydrogenation catalyst includes a molybdenum-based sulfide hydrogenation catalyst.

11 . The refining method of a waste plastic pyrolysis oil of claim 1 , wherein (S2) is performed at a pressure of 200 bar or less.

12 . The refining method of a waste plastic pyrolysis oil of claim 1 , wherein (S2) is performed at a temperature of 300° C. or higher and lower than 450° C.

13 . The refining method of a waste plastic pyrolysis oil of claim 1 , wherein (S2) is performed at a liquid hourly space velocity (LHSV) of 0.1 to 5 h −1 .

14 . A continuous operation method of waste plastic pyrolysis oil refining equipment, the method comprising:
(S1) mixing a waste plastic pyrolysis oil and a sulfur source to prepare a mixed oil fraction; (S2) hydrotreating the mixed oil fraction with a reaction gas including a hydrogen gas (H 2 ) and a hydrogen sulfide gas (H 2 S) at a pressure of 200 bar or less in the presence of a molybdenum-based sulfide hydrogenation catalyst; and (S3) removing by-products of the hydrotreating from a product of (S2) to obtain a refined oil, wherein the hydrogen sulfide gas (H 2 S) of (S2) is separated from the by-products of the hydrotreating of (S3) and supplied again.

15 . The continuous operation method of waste plastic pyrolysis oil refining equipment of claim 14 , wherein sulfur is continuously supplied from the sulfur source to maintain an activity of the molybdenum-based sulfide hydrogenation catalyst.

16 . The continuous operation method of waste plastic pyrolysis oil refining equipment of claim 14 , wherein the mixed oil fraction includes 100 ppm or more of sulfur.

17 . The continuous operation method of waste plastic pyrolysis oil refining equipment of claim 14 , wherein the sulfur source includes a sulfur-containing oil fraction.

18 . The continuous operation method of waste plastic pyrolysis oil refining equipment of claim 17 , wherein the sulfur-containing oil fraction is included at less than 100 parts by weight based on 100 parts by weight of the waste plastic pyrolysis oil.

19 . The continuous operation method of waste plastic pyrolysis oil refining equipment of claim 14 , wherein the sulfur source includes one or two or more sulfur-containing organic compounds selected from disulfide-based compounds, sulfide-based compounds, sulfonate-based compounds, and sulfate-based compounds.

Assignees

• Sk Innovation Co Ltd
• Sk Geo Centric Co Ltd

Inventors

• Kim Kayoung
• Kim Okyoun
• Park Youngmoo
• Jeon Heejung

Classifications

• C10G2300/4018

  Spatial velocity, e.g. LHSV, WHSV · CPC title

• C10G2300/4012

  Pressure · CPC title

• C10G2300/4006

  Temperature · CPC title

• C10G2300/1003

  Waste materials · CPC title

• C10G1/002

  in combination with oil conversion- or refining processes · CPC title