US Patent Issued to Chevron U.S.A. on June 3 for "Circular economy for plastic waste to polypropylene and lubricating oil via refinery FCC and isomerization dewaxing units" (California Inventor)

ALEXANDRIA, Va., June 4 -- United States Patent no. 12,319,877, issued on June 3, was assigned to Chevron U.S.A. Inc. (San Ramon, Calif.).

"Circular economy for plastic waste to polypropylene and lubricating oil via refinery FCC and isomerization dewaxing units" was invented by Hye-Kyung Timken (Albany, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A continuous process for converting waste plastic into recycle for polypropylene polymerization is provided. The process integrates refinery operations to provide an effective and efficient recycle process. The process comprises selecting waste plastics containing polyethylene and polypropylene and then passing the waste plastics through a pyrolysis reacto...