Method for processing plastic waste pyrolysis gas

Patent metadata

Field	Value
Publication number	US-11471817-B2
Application number	US-202017596358-A
Country	US
Kind code	B2
Filing date	Jun 1, 2020
Priority date	Jun 10, 2019
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

The present disclosure relates to methods for processing plastic waste pyrolysis gas, such as methods wherein clogging of the systems used in the method is avoided or at least alleviated.

First claim

What is claimed is:

1. A method for processing plastic waste pyrolysis gas, the method comprising:
a) providing:
a plastic waste pyrolysis gas stream wherein a temperature of the plastic waste pyrolysis gas stream is 300-650° C.; and
a hydrocarbonaceous liquid stream wherein a temperature of the hydrocarbonaceous liquid stream is below temperature of the plastic waste pyrolysis gas stream;
b) admixing in an ejecting means the plastic waste pyrolysis gas stream and the hydrocarbonaceous liquid stream to form an admixture;
c) spraying the admixture to a separation chamber to produce a condensed fraction and a gaseous fraction; and
d) separating the gaseous fraction and the condensed fraction to yield a first liquid product stream and a gaseous product stream.

2. The method according to claim 1 , wherein a temperature of the hydrocarbonaceous liquid stream of step a) is 100-300° C.

3. The method according to claim 1 , wherein a mass ratio of the hydrocarbonaceous liquid stream and the plastic waste pyrolysis gas stream in the admixture is 1-100.

4. The method according to claim 1 , comprising:
recycling a first part of first liquid product stream to the hydrocarbonaceous liquid stream of step a) and collecting a second part of the first liquid product stream.

5. The method according to claim 4 , wherein a temperature of the first part of first liquid product stream is above 100° C.

6. The method according to claim 4 , wherein the hydrocarbonaceous liquid stream of step a) contains the first part of first liquid product stream.

7. The method according to claim 1 , comprising:
cooling the gaseous product stream of step d) to 10-50° C. to yield a second liquid product stream and a gaseous stream.

8. The method according to claim 7 , comprising:
separating the second liquid product stream and the gaseous stream.

9. The method according to claim 1 , comprising:
providing:
a plastic waste pyrolysis gas stream wherein a temperature of the plastic waste pyrolysis gas stream is 450-500° C.

10. The method according to claim 9 , wherein a temperature of the hydrocarbonaceous liquid stream of step a) is 175-225° C.

11. The method according to claim 10 , wherein a mass ratio of the hydrocarbonaceous liquid stream and the plastic waste pyrolysis gas stream in the admixture is 5-25.

12. The method according to claim 11 , wherein a temperature of the first part of first liquid product stream is between 150-250° C.

13. The method according to claim 12 , comprising:
cooling the gaseous product stream of step d) to 20-40° C. to yield the second liquid product stream and the gaseous stream.

14. The method according to claim 2 wherein a mass ratio of the hydrocarbonaceous liquid stream and the plastic waste pyrolysis gas stream in the admixture is 1-100.

15. The method according to claim 14 , comprising:
recycling a first part of first liquid product stream to the hydrocarbonaceous liquid stream of step a) and collecting a second part of the first liquid product stream.

16. The method according to claim 15 , wherein the hydrocarbonaceous liquid stream of step a) contains the first part of first liquid product stream.

17. The method according to claim 16 , comprising:
cooling the gaseous product stream of step d) to 10-50° C. to yield the second liquid product stream and the gaseous stream.

18. The method according to claim 17 , comprising:
separating the second liquid product stream and the gaseous stream.

Assignees

• Neste Oyj

Inventors

• Kurkijärvi Antti
• Lehtinen Hannu
• Korhonen Esa
• Matilainen Mikko
• Nyström Max

Classifications

• B01D53/002 Primary

  by condensation · CPC title

• C10G75/00

  Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general (C10G7/10, C10G9/16 take precedence) · CPC title

• C10B53/07

  {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) · CPC title

• B01D5/0036

  Multiple-effect condensation; Fractional condensation · CPC title

• B01D3/00 Primary

  Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping ({evaporation in general, e.g. of liquids for gas phase reactions B01B1/005;} gas chromatography B01D15/08; destructive distillation C10B; preparation of alcoholic beverages by distillation C12H6/02) · CPC title