Composite catalyst for polyolefin depolymerization
AssigneeBasell Poliolefine Italia S.r.l.
InventorsSandor Nagy, Daniel F. White, Christopher D. Smith, David L. Ramage, Diego Brita, Noel C. Hallinan
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Abstract
Catalytic compositions for depolymerizing polyolefin-based waste material into useful petrochemical products and methods of use are described. The compositions are a composite of at least one zeolite catalyst with one or more co-catalyst(s) that is a solid inorganic material. These composite catalysts, along with heat, are used to both increase the depolymerization reaction rate of the feed streams and suppress poisoning effects of non-polyolefin polymers that may be present. This results in a shorter residence time in the depolymerization unit and more efficient process.
Claims20
A composite catalyst for depolymerizing polymers, comprising
- a) at least one zeolite;
- and,
- b) at least one solid inorganic co-catalyst.
A method of depolymerizing polymers comprising:
- a) adding a polyolefin-based feed stream and a composite catalyst to a reactor heated to a temperature between about 200 and about 600° C., wherein said composite catalyst comprises at least one zeolite and at least one solid inorganic co-catalyst;
- and
- b) reacting said polyolefin-based feed stream with said composite catalyst to depolymerize said polyolefin-based feed stream.
A method of depolymerizing polymers comprising:
- a) adding a polyolefin-based feed stream and a composite catalyst to a reactor heated to a temperature between about 200 and about 600° C., wherein said composite catalyst comprises at least one zeolite and at least one solid inorganic co-catalyst, wherein said polyolefin-based feed stream has up to 10 wt. % of a non-polyolefin component;
- and
- b) reacting said polyolefin-based feed stream with said composite catalyst to depolymerize said polyolefin-based feed stream.
Dependencies are inferred from the claim text.