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

Claim 6:
7. A process for converting waste plastic into useful chemicals comprising:
(a) selecting waste plastics containing polyethylene and/or polypropylene;
(b) pyrolyzing the waste plastics and recovering a pyrolysis oil and optionally wax comprising a naphtha/diesel fraction and a heavy fraction;
(c) passing the pyrolysis oil and wax from (b) 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;
(d) recovering a C3-C5 olefin/paraffin mixture from the FCC unit; and
(e) passing the C3-C5 olefin/paraffin mixture to a refinery alkylation unit.