Recycling method for styrene-containing plastic waste
US-2021277202-A1 · Sep 9, 2021 · US
Styrene-assisted depolymerization of polyolefins
US12173124B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12173124-B2 |
| Application number | US-202117450234-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 7, 2021 |
| Priority date | Oct 9, 2020 |
| Publication date | Dec 24, 2024 |
| Grant date | Dec 24, 2024 |
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Abstract
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Methods of depolymerizing polyolefin-based material into useful petrochemical products using styrene oligomers or polymers, and heat are described. The styrene oligomers or polymers improve the depolymerization reaction by decreasing the halftime for the depolymerization, which results in a higher depolymerization rate and a shorter residence time in the depolymerization unit, allowing for a predictable depolymerization reaction, and decreasing the branching or aromatic formations in the product.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of depolymerizing polyolefins comprising: a) adding a polyolefin-based feed stream and a styrene oligomer or a styrene polymer to a depolymerization unit heated to a temperature between about 200° C. and about 600° C.; and b) reacting said polyolefin-based feed stream with said styrene oligomer or said styrene polymer to depolymerize said polyolefin-based feed stream. 2. The method of claim 1 , wherein said polyolefin-based feed stream is combined with said styrene oligomer. 3. The method of claim 2 , wherein said styrene oligomer is an oligostyrene. 4. The method of claim 1 , wherein said polyolefin-based feed stream is combined with said styrene polymer. 5. The method of claim 4 , wherein said styrene polymer is a polystyrene. 6. The method of claim 1 , wherein said polyolefin-based feed stream is a low-density polyethylene, a high density polyethylene, a polypropylene, or a combination thereof. 7. The method of claim 1 , wherein said polyolefin-based feed stream is post-consumer waste. 8. The method of claim 1 , wherein said polyolefin-based feed stream is post-industrial waste. 9. The method of claim 1 , wherein said polyolefin-based feed stream comprises both post-industrial waste and post-consumer waste. 10. The method of claim 1 , wherein the polystyrene is post-consumer waste, post-industrial waste, or a combination thereof. 11. The method of claim 1 , wherein the concentration of said styrene oligomer or said styrene polymer is between greater than 0 to about 20 weight percent. 12. The method of claim 11 , wherein the concentration of said styrene oligomer or said styrene polymer is between about 2.5 and about 5 weight percent.
Assignees
Inventors
Classifications
Polystyrene · CPC title
Polypropene · CPC title
Polyethene · CPC title
Plastics recycling; Rubber recycling · CPC title
Homopolymers or copolymers of ethene · CPC title
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- What does patent US12173124B2 cover?
- Methods of depolymerizing polyolefin-based material into useful petrochemical products using styrene oligomers or polymers, and heat are described. The styrene oligomers or polymers improve the depolymerization reaction by decreasing the halftime for the depolymerization, which results in a higher depolymerization rate and a shorter residence time in the depolymerization unit, allowing for a pr…
- Who is the assignee on this patent?
- Basell Poliolefine Italia Srl
- What technology area does this patent fall under?
- Primary CPC classification C10G1/10. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 24 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).