Carbon fiber materials from waste polyethylene and polyethylene oil

Patent metadata

Field	Value
Publication number	US-12577112-B2
Application number	US-202318187493-A
Country	US
Kind code	B2
Filing date	Mar 21, 2023
Priority date	Mar 21, 2022
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

In one aspect, manufacturing carbon fiber materials includes combining waste plastic with waste polyethylene oil to yield infused waste plastic, combining the infused waste plastic with sulfuric acid to yield a mixture, irradiating the mixture with microwave radiation to yield sulfonated waste plastic, and carbonizing the sulfonated waste plastic to yield the carbon fiber materials. In another aspect, manufacturing carbon fiber materials includes combining waste polyethylene oil with sulfuric acid to yield a mixture, combining the mixture with waste plastic to yield infused waste plastic, irradiating the infused waste plastic with microwave radiation to yield sulfonated waste plastic, and carbonizing the sulfonated waste plastic to yield the carbon fiber materials.

First claim

What is claimed is:

1 . A method of manufacturing carbon fiber materials, the method comprising:
combining waste plastic with waste polyethylene oil to yield infused waste plastic; combining the infused waste plastic with sulfuric acid to yield a mixture; irradiating the mixture with microwave radiation to yield sulfonated waste plastic; and carbonizing the sulfonated waste plastic to yield the carbon fiber materials.

2 . The method of claim 1 , wherein the waste polyethylene oil is chemically heterogeneous.

3 . The method of claim 1 , wherein the waste polyethylene oil is prepared by solvothermal liquefaction.

4 . The method of claim 3 , wherein the solvothermal liquefaction comprises:
combining waste plastic with a solvent to form a mixture; and heating the mixture.

5 . The method of claim 4 , further comprising heating the mixture under pressure in range of about 20 MPa to about 25 MPa.

6 . The method of claim 4 , wherein the solvent comprises one or more of acetone, alcohol, nitric acid, and water.

7 . The method of claim 1 , wherein the waste plastic comprises polyolefins.

8 . The method of claim 7 , wherein the polyolefins comprise high density polyethylene, low density polyethylene, polypropylene, or a combination thereof.

9 . The method of claim 1 , wherein irradiating the mixture with the microwave radiation comprises heating the mixture to a temperature of at least 100° C.

10 . The method of claim 9 , wherein irradiating the mixture with the microwave radiation comprises heating the mixture to a temperature in a range between 100° C. and 200° C.

11 . The method of claim 10 , wherein irradiating the mixture with the microwave radiation comprises heating the mixture to a temperature in a range between 150° C. and 200° C.

12 . The method of claim 1 , wherein the infused waste plastic comprises between 5 wt % and 15 wt % of the waste polyethylene oil.

13 . The method of claim 1 , wherein carbonizing the sulfonated waste plastic comprises heating the sulfonated waste plastic to a temperature of at least 750° C.

14 . A method of manufacturing carbon fiber materials, the method comprising:
combining waste polyethylene oil with sulfuric acid to yield a mixture; combining the mixture with waste plastic to yield infused waste plastic; irradiating the infused waste plastic with microwave radiation to yield sulfonated waste plastic; and carbonizing the sulfonated waste plastic to yield the carbon fiber materials.

15 . The method of claim 14 , wherein the waste polyethylene oil is chemically heterogeneous.

16 . The method of claim 14 , wherein the waste polyethylene oil is made by solvothermal liquefaction of waste plastic.

17 . The method of claim 14 , wherein the waste plastic comprises polyolefins.

18 . The method of claim 17 , wherein the polyolefins comprise high density polyethylene, low density polyethylene, polypropylene, or a combination thereof.

19 . The method of claim 14 , wherein irradiating the infused waste plastic with the microwave radiation comprises heating the infused waste plastic to a temperature of at least 100° C.

20 . The method of claim 19 , wherein irradiating the infused waste plastic with the microwave radiation comprises heating the infused waste plastic to a temperature in a range between 100° C. and 200° C.

21 . The method of claim 20 , wherein irradiating the infused waste plastic with the microwave radiation comprises heating the infused waste plastic to a temperature in a range between 150° C. and 200° C.

22 . The method of claim 14 , wherein the infused waste plastic comprises between 5 wt % and 15 wt % of the waste polyethylene oil.

23 . The method of claim 14 , wherein carbonizing the sulfonated waste plastic comprises heating the sulfonated waste plastic to a temperature of at least 750° C.

Assignees

• Fini Elham
• Hung Albert
• Univ Arizona State

Inventors

• Fini Elham
• Hung Albert

Classifications

• C01B32/382

  Making shaped products, e.g. fibres, spheres, membranes or foam · CPC title

• C08J11/16

  by treatment with inorganic material (C08J11/14 takes precedence) · CPC title

• C01B32/324 Primary

  from waste materials, e.g. tyres or spent sulfite pulp liquor · CPC title

• D01F9/21 Primary

  from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title