- Patent Number:
12122,960
- Appl. No:
18/753666
- Application Filed:
June 25, 2024
- نبذة مختصرة :
A method of converting a polymer including contacting a catalyst with a low-density polyethylene polymer to form a mixture and heating the mixture to a temperature of 200 degrees Celsius (° C.) to 600° C. in a microwave reactor to form a product. The catalyst includes an HZSM-5 zeolite, and 1 weight percent (wt. %) to 10 wt. % gallium and 0.1% to 5 wt. % copper, based on the total weight of the catalyst.
- Inventors:
KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS (Dhahran, SA)
- Assignees:
KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS (Dhahran, SA)
- Claim:
1. A method of converting a polymer, comprising: contacting a catalyst with a low-density polyethylene polymer to form a mixture; and heating the mixture to a temperature of 200-600° C. in a microwave reactor to form a product, wherein the product comprises 20-99 weight % gas and 1-30 weight % liquid based on a total weight of the gas, the liquid and coke in the product, wherein the catalyst comprises an HZSM-5 zeolite, comprising: 1-10 wt. % gallium, and 0.1-5 wt. % copper, based on a total weight of the catalyst.
- Claim:
2. The method of claim 1 , wherein the catalyst has a BET surface area of 250-350 m 2 /g.
- Claim:
3. The method of claim 1 , wherein the catalyst has a pore volume of 0.01-0.1 cm 3 /g.
- Claim:
4. The method of claim 1 , wherein the catalyst is crystalline.
- Claim:
5. The method of claim 1 , wherein the gallium and the copper are present in pores of the HZSM-5 zeolite.
- Claim:
6. The method of claim 1 , wherein the catalyst comprises 50-60 wt. % O, 30-40 wt. % Si, 1-5 wt. % Al, 1-10 wt. % Ga and 0.1-5 wt. % Cu, based on a total weight of the catalyst.
- Claim:
7. The method of claim 1 , wherein particles of the catalyst have an average size of 1-100 μm.
- Claim:
8. The method of claim 1 , wherein the catalyst is in the form of aggregated particles.
- Claim:
9. The method of claim 1 , wherein the mixture comprises a weight ratio of the catalyst to the low-density polyethylene polymer of 1-15 to 1-15.
- Claim:
10. The method of claim 1 , wherein the heating is conducted in an absence of oxygen.
- Claim:
11. The method of claim 1 , wherein the heating is conducted for 1-60 minutes.
- Claim:
12. The method of claim 1 , wherein the mixture further comprises at least one selected from the group consisting of silicon carbide, activated carbon, graphite, and alumina.
- Claim:
13. The method of claim 1 , wherein the product comprises less than 1 weight % coke.
- Claim:
14. The method of claim 1 , wherein the gas is at least one selected from the group consisting of hydrogen, an alkane having 1-5 carbons, and an olefin having 2-4 carbons.
- Claim:
15. The method of claim 1 , wherein the liquid is at least one selected from the group consisting of aromatic compounds having 9-12 carbons, aromatic compounds having 13-17 carbons, olefins having greater than 9 carbons, paraffins having greater than 9 carbons, and other aliphatics.
- Claim:
16. The method of claim 1 , wherein the liquid comprises about 90 weight % aromatic compounds having 9-12 carbons.
- Claim:
17. The method of claim 1 , wherein the gas is 15-20 vol. % hydrogen, based on a total volume of the gas.
- Claim:
18. The method of claim 17 , wherein the hydrogen is collected and used to power the microwave reactor.
- Claim:
19. The method of claim 1 , wherein the low-density polyethylene polymer is a waste product.
- Claim:
20. The method of claim 1 , wherein the low-density polyethylene polymer has a density of from 0.91-0.93 g/cm 3 , and wherein during the heating, the microwave reactor contains only the catalyst, a silicon carbide microwave adsorbent, the low-density polyethylene polymer and the product.
- Patent References Cited:
9200207 December 2015 Huang et al.
10421062 September 2019 Gaffney
20210347960 November 2021 Hu et al.
20240131503 April 2024 Chareonpanich
20240182790 June 2024 Cheng
117563661 February 2024
2024/015567 January 2024
- Other References:
Zhang et al. (Production of monocyclic aromatics and light olefins through ex-situ catalytic pyrolysis of low-density polyethylene over Ga/P/ZSM-5 catalyst, 2023, Journal of the Energy Institute 108, 01235) (Year: 2023). cited by examiner
Zhang et al. (Gasoline-range hydrocarbons produced from microwave-induced pyrolysis of low-density polyethylene over ZSM-5, 2015, Fuel, 144, 33-42) (Year: 2015). cited by examiner
Hong et al. (Microwave heating performances of low density polyethylene (LDPE) plastic particles, 2021, Journal of Analytical and Applied Pyrolysis 160, 105356) (Year: 2021). cited by examiner
Zhang et al. ; Production of monocyclic aromatics and light olefins through ex-situ catalytic pyrolysis of low-density polyethylene over Ga/P/ZSM-5 catalyst ; Journal of the Energy Institute, vol. 108 ; Jun. 2023 ; 6 Pages. cited by applicant
- Primary Examiner:
Jeong, Youngsul
- Attorney, Agent or Firm:
Oblon, McClelland, Maier & Neustadt, L.L.P.
- الرقم المعرف:
edspgr.12122960
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