IP Library › Granted Patent US 12,312,540
Granted Patent B2
US 12,312,540 · App. 17/755,327 · Granted May 27, 2025

Pyrolysis method and system for recycled waste

Inventors: Xianchun Wu (Longview, TX); Daryl Bitting (Longview, TX); Kenny Randolph Parker (Afton, TN); Michael Gary Polasek (Longview, TX); David Eugene Slivensky (Tatum, TX); Carey Dan Ashcroft (Longview, TX); Damon Ray Billodeaux (Longview, TX)
Assignee: Eastman Chemical Company
C10G1/08C10G1/10C10G2300/1003
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Quick Facts
Patent No.
US 12,312,540
App. No.
17/755,327
Filed
Apr 27, 2022
Granted
May 27, 2025
Kind
B2
Art Unit
1772
USPC
208/419
Abstract

A pyrolysis method and system are provided that enhances the production of C3 and C4 alkanes in the resulting pyrolysis effluent. More particularly, the disclosed pyrolysis method and system may be configured to enhance the production of C3 and C4 alkanes due to the use of certain pyrolysis catalysts and more intense pyrolysis conditions.

Claims (17)

1. A method of making a pyrolysis effluent, said method

(a) introducing a pyrolysis feed into a pyrolysis unit, wherein said pyrolysis feed comprises at least one recycled waste; and

(b) pyrolyzing at least a portion of said pyrolysis feed in the absence of a catalyst to thereby form a pyrolysis effluent comprising at least 20 weight percent of a pyrolysis gas and a pyrolysis oil, wherein said pyrolysis gas comprises a combined C3/C4 hydrocarbon content of at least 25 weight percent; and wherein said pyrolysis oil is sent to a steam cracker that produces r-ethylene and r-propylene; and wherein said pyrolysis gas is sent to a fractionator downstream of said steam cracker.

2. The method according to claim 1 , wherein said recycled waste comprises post-consumer waste and/or post-industrial waste.

3. The method according to claim 2 , wherein said post-consumer waste comprises a waste plastic, a waste rubber, a textile, modified cellulose, wet-laid products, or combinations thereof.

4. The method according to claim 2 , wherein said pyrolysis feed comprises at least 30 weight percent of at least one of four post-consumer wastes.

5. The method according to claim 4 , wherein said recycled waste comprises at least one recycled waste plastic.

6. The method according to claim 5 , wherein said pyrolysis feed comprises at least 30 weight percent of at least one recycled waste plastic.

7. The method according to claim 5 , wherein said pyrolysis feed comprises at least 30 weight percent of polyethylene and/or polypropylene.

8. The method according to claim 1 , wherein said pyrolysis effluent comprises at least 40 weight percent of a pyrolysis oil.

9. The method according to claim 8 , wherein said pyrolysis oil comprises an aromatic content of less than 15 weight percent.

10. The method according to claim 1 , wherein said pyrolysis gas comprises a C3 hydrocarbon content of at least 1 weight percent.

11. The method according to claim 10 , wherein said pyrolysis gas comprises a C4 hydrocarbon content of at least 1 weight percent.

12. The method according to claim 1 , wherein said pyrolyzing of step (b) occurs at a temperature of at least 550° C. and/or not more than 1,100° C.

13. The method according to claim 12 , wherein said pyrolyzing of step (b) occurs in a pyrolysis unit, wherein said pyrolysis unit comprises a fluidized bed reactor, a transported bed reactor, an ablative (vortex) reactor, an extruder reactor, a microwave reactor, a fixed bed reactor, a vacuum reactor, an autoclave reactor, a rotary kiln, or a tubular reactor.

14. The method according to claim 13 , wherein said pyrolyzing of step (b) occurs at a residence of at least 0.1 seconds and less than 10 seconds.

15. The method according to claim 14 , wherein said pyrolyzing of step (b) occurs in the presence of a pyrolysis catalyst.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 20, 2025
From: EASTMAN CHEMICAL COMPANY
To: EXXONMOBIL PRODUCT SOLUTIONS COMPANY
Reel/Frame 073142/0954 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 19, 2022
From: WU, XIANCHUN; BITTING, DARYL; PARKER, KENNY RANDOLPH; POLASEK, MICHAEL GARY; SLIVENSKY, DAVID EUGENE; ASHCROFT, CAREY DAN; BILLODEAUX, DAMON RAY
To: EASTMAN CHEMICAL COMPANY
Reel/Frame 060548/0433 →
Continuity (2)
Provisional Application 62928441 · Oct 31, 2019
Related Publication 20220363996A1 · Nov 17, 2022
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