Patent ID: 11959025
Assignee: CHEVRON U.S.A. INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B  F  Y | IPC C

Claim 0:
1. A continuous process for converting waste plastic into recycle for polypropylene polymerization 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, a naphtha/diesel fraction, a heavy fraction, and char;
(d) passing the naphtha/diesel fraction to a refinery FCC unit along with virgin crude oil with volume flow of the naphtha/diesel fraction comprising about 50 volume % or less of total hydrocarbon flow to the FCC unit;
(e) recovering a liquid petroleum gas C3 olefin/paraffin mixture from the FCC unit;
(f) separating the C3 paraffin and C3 olefin into different fractions;
(g) passing the C3 olefin to a propylene polymerization reactor;
(h) passing the heavy fraction of (c) to an isomerization dewaxing unit to produce a base oil; and
(i) recovering a gasoline and heavy fraction from the FCC unit and further processing in the refinery to gasoline.