Patent ID: 11905466
Assignee: CHEVRON U.S.A. INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A continuous process for converting waste plastic into polyethylene recycle comprising:
(a) selecting waste plastics containing polyethylene and/or polypropylene;
(b) passing the waste plastics from (a) through a pyrolysis reactor to thermally crack at least a portion of the waste plastics and produce a pyrolyzed effluent;
(c) separating the pyrolyzed effluent into offgas, char and a pyrolysis oil comprising a naphtha/diesel fraction and a heavy fraction;
(d) passing the pyrolyzed oil from (c) to a refinery FCC unit along with virgin crude oil with volume flow of the pyrolysis oil comprising about 50 volume % or less of total hydrocarbon flow to the FCC unit;
(e) recovering a liquid petroleum gas C3 olefin/paraffin mixture fraction from the FCC unit; and
(f) passing the C3 olefin/paraffin fraction to a steam cracker for ethylene production.