Supported metal oxides as depolymerization catalysts
AssigneeBasell Poliolefine Italia S.r.l.
InventorsSandor Nagy, Daniel F. White, Christopher D. Smith, Xueyong Yang, David L. Ramage
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Abstract
Methods of depolymerizing polyolefin-based material into useful petrochemical products using supported metal oxides and heat are described. The supported metal oxides improve the depolymerization reaction by decreasing the half time for the depolymerization, which results in a higher depolymerization rate and a shorter residence time in the depolymerization unit, allowing for a predictable depolymerization reaction, and decreasing the branching or aromatic formations in the product.
Claims20
A method of depolymerizing polyolefins comprising:
- a) adding a polyolefin-based feed stream and at least one supported metal oxide to a reactor heated to a temperature between about 200 and about 600° C.;
- and
- b) reacting said polyolefin-based feed stream with said at least one supported metal oxide to depolymerize said polyolefin-based feed stream;
- wherein the at least one supported metal oxide has a metal oxide loading of 0.1 to 3 mmol/g of support material, and
- wherein the at least one supported metal oxide is present in an amount between greater than 0% and about 20% by weight of the polyolefin-based feed stream.
A method of depolymerizing a polyolefin-based feed stream comprising:
- a) adding a polyolefin-based feed stream and at least one supported metal oxide in a reactor at a predetermined temperature, wherein the at least one supported metal oxide has a metal oxide loading of 0.1 to 3 mmol/g of support material, and wherein the at least one supported metal oxide is present in an amount between greater than 0% and about 20% by weight of the polyolefin-based feed stream;
- and
- b) reacting said polyolefin-based feed stream with said at least one supported metal oxide to depolymerize said polyolefin-based feed stream.
A method of depolymerizing polyolefins comprising:
- a) adding a polyolefin-based feed stream and at least one supported metal oxide to a reactor heated to a temperature between about 200 and about 600° C., wherein the at least one supported metal oxide has a metal oxide loading of 0.1 to 3 mmol/g of support material, wherein the at least one supported metal oxide is present in an amount between greater than 0% and about 20% by weight of the polyolefin-based feed stream, and wherein the polyolefin-based feed stream comprises post-industrial waste, post-consumer waste, or both;
- and
- b) reacting said polyolefin-based feed stream with said at least one supported metal oxide to depolymerize said polyolefin-based feed stream.
Dependencies are inferred from the claim text.