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US 12,716,031 B2Granted
Separation and processing of recycled content pyrolysis gas
AssigneeExxonMobil Product Solutions Company
InventorsXianchun Wu, Daryl Bitting, Michael Gary Polasek, David Eugene Slivensky
Life of this patent
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Abstract
Processes and facilities for providing recycled content hydrocarbon products (r-products) from separation of pyrolysis gas formed by pyrolyzing waste plastic are provided. Various separation schemes may be employed to process the recycled content pyrolysis gas (r-pygas) into one or more recycled content hydrocarbon streams, which can be used in forming a variety of recycled content products.
Claims16
A chemical recycling process, the process comprising:
- (a) pyrolyzing waste plastic to thereby provide a recycled content pyrolysis gas (r-pygas);
- (b) separating the r-pygas into a first recycled content portion (r-first portion) and a recycled content second portion (r-second portion);
- (c) introducing at least a portion of the r-first portion into a cracking furnace of a cracker facility and combining the r-first portion with a hydrocarbon feed stream introduced into the cracker furnace and cracking the combined stream to produce a furnace effluent, wherein the hydrocarbon feed stream includes non-recycled content, and wherein the hydrocarbon feed stream includes predominantly C3 to C22 hydrocarbons;
- and
- (d) introducing at least a portion of the r-second portion into at least one location in the cracker facility downstream of the cracking furnace, wherein pyrolyzing comprises forming a pyrolysis effluent vapor, separating at least a portion of the pyrolysis effluent vapor to form the r-pygas and a recycled content pyrolysis oil (r-pyoil), and introducing at least a portion of the r-pyoil into the cracker furnace.
2 more elements
A chemical recycling process, the process comprising:
- (a) pyrolyzing waste plastic to thereby provide a recycled content pyrolysis gas (r-pygas), wherein pyrolyzing further comprises forming a pyrolysis effluent vapor, separating at least a portion of the pyrolysis effluent vapor to form the r-pygas and a recycled content pyrolysis oil (r-pyoil), and introducing at least a portion of the r-pyoil into the cracker furnace;
- (b) separating at least a portion of the r-pyrolysis gas in at least one separation vessel to provide a recycled content overhead vapor (r-overhead) comprising predominantly Cn and lighter hydrocarbons and a recycled content bottoms liquid (r-bottoms) comprising predominantly C(n+1) and heavier hydrocarbons, wherein n is an integer between 1 and 5, inclusive;
- and
- (c) performing at least one of the following steps (i) and (ii)—
- (i) introducing at least a portion of the r-bottoms into a furnace of a cracking facility;
- and
- (ii) introducing at least a portion of the r-overhead into a location downstream of the furnace in the cracking facility.
4 more elements
Dependencies are inferred from the claim text.