CIRCULAR ECONOMY FOR PLASTIC WASTE TO POLYPROPYLENE VIA REFINERY FCC UNIT

摘要

Provided is a continuous process for converting waste plastic into recycle for polypropylene polymerization. The process comprises selecting waste plastics containing polyethylene and/or polypropylene, and passing the waste plastics through a pyrolysis reactor to thermally crack at least a portion of the polyolefin waste and produce a pyrolyzed effluent. The pyrolyzed effluent is separated into offgas, a naphtha/diesel fraction, a heavy fraction, and char. Pyrolysis oil and wax, comprising naphtha/diesel and heavy fractions, is passed to a refinery FCC unit. A liquid petroleum gas C₃ olefin/paraffin mixture is recovered from the FCC unit. The C₃ paraffins and C₃ olefins are separated into different fractions with the C₃ olefin fraction passed to a propylene polymerization reactor, and the C₃ paraffin fraction passed optionally to a dehydrogenation unit to produce additional propylene.