Catalytic oxidative depolymerization process
AssigneeBasell Poliolefine Italia S.r.l.
InventorsDaniel F. White, Sandor Nagy, Christopher D. Smith, David L. Ramage, 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 catalytic compositions are mixed metal oxides demonstrating equal or higher conversion than noncatalytic pyrolysis. These mixed metal oxide catalysts and a polyolefin-based material are heated in the presence of oxygen to form a product comprising one or more olefin monomers.
Claims20
A catalyst composition for depolymerizing polymers, comprising a mixed metal oxide,
- M
- x
- 1
-
- M
- y
- 2
-
- O
- z
- ,
- wherein:
- M1 comprises a molecule of barium titanate, strontium, lanthanum, iron, molybdenum, manganese, bismuth, yttrium, or scandium;
- x is the number of molecules of M1;
- M2 comprises a molecule of strontium, lanthanum, copper, barium, manganese, or magnesium;
- y is the number of molecules of M2;
- z is the number of oxygen molecules to charge balance x molecules of M1 and y molecules of M2 in the mixed metal oxide;
- and
- M1 is different than M2.
A process comprising:
- a) adding a polyolefin-based feed stream and a reaction medium comprising nitrogen and oxygen to a first pyrolysis reaction zone to form a first reaction mixture;
- b) reacting the first reaction mixture under depolymerization conditions to form a first depolymerization product, wherein the first depolymerization product comprises a first content of one or more olefin monomers;
- and
- c) withdrawing the first depolymerization product from the first pyrolysis reaction zone.
A depolymerization system comprising a first pyrolysis reaction zone to heat a mixture of a polyolefin-based waste material, nitrogen, oxygen, and optionally a first catalyst composition and to form a first product and optionally a first spent catalyst, wherein the first product comprises a first content of one or more olefin monomers.
Dependencies are inferred from the claim text.