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US 12,454,605 B2Granted
Method for recycling polyvinyl chloride (PVC) to produce high density polyethylene (HDPE)
AssigneeOregon State University
InventorsKonstantinos Goulas, Scott Svadlenak
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Abstract
Disclosed herein is a process to convert PVC plastic into a dechlorinated polymer, such as high density polyethylene, while substantially avoiding carbonization. The process also facilitates Cl recovery and/or reintroducing the dechlorinated plastic into product streams. In some embodiments, the process comprises heating a mixture of PVC and a catalyst and/or a base in a solvent, optionally in the presence of hydrogen gas.
Claims17
A method, comprising:
- mixing polyvinylchloride (PVC) with
- a solvent and
- a catalyst and a base,
- to form a first mixture;
- and
- heating the first mixture in the presence of hydrogen gas, to form a second mixture comprising polyethylene;
- wherein the base is a hydroxide base, an alkylamine, a dialkylamine, a trialkylamine, or a combination thereof.
4 more elements
A method, comprising:
- mixing polyvinylchloride (PVC) with
- an aqueous solvent,
- a catalyst selected from 5 wt % Pd on carbon, 5 wt % Pt on carbon, or dichloro(1,2-bis(diphenylphosphino)ethane)nickel, and
- an amine base, to form a first mixture, the first mixture having a PVC:
- catalyst ratio of from 10:1 to 3:1 wt:wt;
- and
- heating the first mixture in the presence of hydrogen gas at a pressure of from 50 PSI to 150 PSI and at a temperature of from 75° C. to 350° C., to form a second mixture comprising polyethylene.
4 more elements
Dependencies are inferred from the claim text.