Method for removing chlorine from waste plastic pyrolysis oil

Patent metadata

Field	Value
Publication number	US-2025163332-A1
Application number	US-202318841676-A
Country	US
Kind code	A1
Filing date	Mar 7, 2023
Priority date	Mar 7, 2022
Publication date	May 22, 2025
Grant date	—

Abstract

The present disclosure relates to a method for removing chlorine from waste plastic pyrolysis oil, the method including: (S1) mixing and reacting waste plastic pyrolysis oil with a neutralizing solution that contains a neutralizer containing M-OR 1 and a solvent; and (S2) subjecting a fluid generated in the step (S1) to a water treatment to remove chlorine, wherein M is an alkali metal or an alkaline earth metal, and R 1 is a C 1 to C 10 alkyl group.

First claim

1 . A method for removing chlorine from waste plastic pyrolysis oil, the method comprising:
(S1) mixing and reacting waste plastic pyrolysis oil with a neutralizing solution that contains a neutralizer containing M-OR 1 and a solvent; and (S2) subjecting a fluid generated in the operation (S1) to a water treatment to remove chlorine, wherein M is an alkali metal or an alkaline earth metal, and R 1 is a C 1 to C 10 alkyl group.

2 . The method of claim 1 , wherein the operation (S1) is performed at a temperature of 300 to 500° C.

3 . The method of claim 1 , wherein in the operation (S1), M-OR 1 contains Na—OR 2 , where R 2 is a C 1 to C 4 alkyl group.

4 . The method of claim 1 , wherein in operation (S1), the solvent contains an alcohol.

5 . The method of claim 4 , wherein the alcohol has a molecular weight of 25 to 800 g/mol and a density of 0.5 to 1.1 g/cm 3 .

6 . The method of claim 4 , wherein a difference in density between the waste plastic pyrolysis oil and the alcohol is 0.3 g/cm 3 or less.

7 . The method of claim 4 , wherein the solvent further contains water.

8 . The method of claim 1 , wherein in the operation (S1), an inorganic bead catalyst is added to a batch reactor together with the waste plastic pyrolysis oil and the neutralizing solution to perform a reaction.

9 . The method of claim 1 , wherein the operation (S1) is performed by passing the waste plastic pyrolysis oil and the neutralizing solution through a fixed bed reactor filled with an inorganic bead catalyst.

10 . The method of claim 1 , wherein the operation (S2) is performed at 30 to 250° C. and 2 to 50 bar.

11 . The method of claim 1 , wherein the operation (S2) is performed by supplying washing water to the fluid generated in the operation (S1), washing the fluid with water, and discharging an aqueous solution containing chlorine.

12 . The method of claim 1 , wherein 90% or more of the chlorine in the waste plastic pyrolysis oil is removed through the operation (S1) and (S2).

13 . An apparatus for removing chlorine from waste plastic pyrolysis oil, the apparatus comprising:
a mixer into which a neutralizer containing M-OR 1 and a solvent are introduced and in which the neutralizer containing M-OR 1 and the solvent are mixed with each other to generate a neutralizing solution; a reactor into which the neutralizing solution generated in the mixer and waste plastic pyrolysis oil are introduced and in which the neutralizing solution and the waste plastic pyrolysis oil react with each other; and a desalter into which a fluid generated in the reactor and washing water are introduced, in which impurities in the fluid are washed with water, and from which an aqueous solution containing chlorine is discharged, wherein M is an alkali metal or an alkaline earth metal, and R 1 is a C 1 to C 10 alkyl group.

14 . The apparatus of claim 13 , wherein a temperature of the reactor is 300 to 500° C.

15 . The apparatus of claim 13 , wherein the reactor is a batch reactor, and an inorganic bead catalyst is introduced into the reactor.

16 . The apparatus of claim 13 , wherein the reactor is a fixed bed reactor filled with an inorganic bead catalyst.

17 . The apparatus of claim 13 , wherein the desalter further includes an electric field application unit.

18 . The apparatus of claim 13 , wherein the desalter further includes a plurality of outlets, and the outlet further includes a density profiler.

19 . The apparatus of claim 13 , wherein a temperature of the desalter is 30 to 250° C., and a pressure of the desalter is 2 to 50 bar.

Assignees

• Sk Innovation Co Ltd
• Sk Geo Centric Co Ltd

Inventors

• Jeon Heejung
• Kim Okyoun
• Kim Kayoung
• Park Gyutae
• Park Youngmoo
• Lee Jaehwan

Classifications

• C10G2300/44

  Solvents · CPC title

• C10G2300/4012

  Pressure · CPC title

• C10G2300/4006

  Temperature · CPC title

• C10G2300/202

  Heteroatoms content, i.e. S, N, O, P · CPC title

• C10G2300/1003

  Waste materials · CPC title