Methods for producing fluorided-chlorided silica-coated alumina activator-supports and catalyst systems containing the same
AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Uriah Kilgore, Qing Yang, Kathy S. Collins
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Abstract
Methods for the preparation of fluorided-chlorided silica-coated alumina activator-supports are disclosed. These activator-supports can be used in catalyst systems for the production of olefin-based polymers, such as polyethylene and polypropylene.
Claims20
A catalyst composition comprising:
- an activator-support comprising a fluorided-chlorided silica-coated alumina;
- a metallocene compound;
- and
- optionally, a co-catalyst;
- wherein:
- a catalyst activity of the catalyst composition is greater than that of a catalyst system containing a fluorided silica-coated alumina, under the same polymerization conditions.
An olefin polymerization process, the process comprising contacting a catalyst composition with an olefin monomer and an optional olefin comonomer in a polymerization reactor system under polymerization conditions to produce an olefin polymer, wherein the catalyst composition comprises an activator-support comprising a fluorided-chlorided silica-coated alumina, a metallocene compound, and an optional co-catalyst;
- wherein:
- a catalyst activity of the catalyst composition is greater than that of a catalyst system containing a fluorided silica-coated alumina, under the same polymerization conditions.
A process to produce a fluorided-chlorided silica-coated alumina, the process comprising:
- (a) calcining a silica-coated alumina at a peak calcining temperature to produce a calcined silica-coated alumina;
- (b) contacting the calcined silica-coated alumina with a chlorine-containing compound and calcining at a peak chloriding temperature to produce a chlorided silica-coated alumina;
- and
- (c) contacting the chlorided silica-coated alumina with a fluorine-containing compound and calcining at a peak fluoriding temperature to produce the fluorided-chlorided silica-coated alumina;
- wherein:
- an activity of a catalyst composition containing the fluorided-chlorided silica-coated alumina is greater than that of a catalyst system containing a chlorided-fluorided silica-coated alumina, under the same polymerization conditions.
Dependencies are inferred from the claim text.