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US 2022/0010212 A1Published application
High-temperature pyrolysis of plastics to monomers with high carbon to gas ratio
AssigneeUop LLC
InventorsYili Shi, Paul T. Barger, Hayim Abrevaya
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Abstract
A high-temperature plastic pyrolysis process that can produce high yields of ethylene, propylene and other light olefins from waste plastics is disclosed. The plastic feed is pyrolyzed at a high temperature of about 600 to about 900° C. directly to monomers, such as ethylene and propylene. During pyrolysis, the plastic feed is contacted with a diluent gas stream at a mole ratio of carbon feed to diluent gas of 0.6 to 20.
Claims20
A process for converting plastics to monomers comprising:
- heating a plastic feed stream to an elevated temperature of about 600 to about 1100° C.;
- contacting the plastic feed stream with a diluent gas stream at a carbon feed to diluent gas mole ratio of 0.6 to 20;
- pyrolyzing the plastic to gaseous products including monomers;
- and
- recovering said monomers from said gaseous products.
2 more elements
A process for converting plastics to monomers comprising:
- contacting a plastic feed stream with a stream of hot heat carrier particles at an elevated temperature to heat the plastic feed stream to a temperature of about 600 to about 1100° C. in the presence of a diluent gas stream at a carbon feed to diluent gas mole ratio of 0.6 to 20;
- pyrolyzing the plastic to gaseous products including monomers;
- and
- recovering said monomers from said gaseous products.
1 more element
A process for converting plastics to monomers comprising:
- contacting a plastic feed stream with a stream of hot heat carrier particles in a reactor at an elevated temperature to heat the plastic feed stream to a temperature of about 600 to about 1100° C. in the presence of a diluent gas stream at a carbon feed to diluent gas mole ratio of 0.6 to 20;
- pyrolyzing the plastic to gaseous products including monomers;
- and
- separating the heat carrier particles from the gaseous products;
- recovering said monomers from the gaseous products;
- reheating the separated heat carrier particles in a reheater;
- and
- recycling the stream of hot heat carrier particles from the reheater to the reactor.
5 more elements
Dependencies are inferred from the claim text.