Use of blend of polystyrene with hydrocarbon feedstock for gasoline and chemicals preparation
AssigneeChevron U.S.A. Inc.
InventorsTengfei LIU, Joel E. SCHMIDT, Hye-Kyung Cho TIMKEN
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Abstract
Provided is a continuous process for converting waste polystyrene plastic into recycle for chemical and gasoline production. The process comprises selecting waste polystyrene and preparing a stable blend of a hydrocarbon feedstock and the polystyrene. The amount of plastic in the blend comprises no more than 20 wt. % of the blend. The blend is passed to a conversion unit. Useful chemicals can be recovered, including C3 and C4 olefins and aromatics, as well as high octane gasoline.
Claims23
A continuous process for converting polystyrene plastic into recycle for chemicals and fuel products comprising:
- (a) selecting waste plastics comprising polystyrene;
- (b) preparing a blend of hydrocarbon feedstock and the polystyrene plastic with the blend comprising about 20 wt. % or less of the polystyrene plastic;
- (c) passing the blend at a temperature above the melting point of the polystyrene in the blend to a refinery FCC unit;
- (d) recovering a naphtha mixture from the FCC unit;
- and
- (e) passing the naphtha mixture to an aromatics separation unit.
A continuous process for converting polystyrene plastic into recycle for chemicals and gasoline comprising:
- (a) selecting waste plastics containing polystyrene;
- (b) preparing a blend of hydrocarbon feedstock and the polystyrene plastic, with the blend comprising about 20 wt. % or less of the polystyrene plastic;
- (c) passing the blend to a hydrocracking unit;
- (d) recovering C3 paraffin and naphtha from the hydrocracking unit;
- and
- (e) passing the C3 paraffin and naphtha recovered from the hydrocracking unit to a chemicals production unit.
Dependencies are inferred from the claim text.