Back to results
US 12,161,997 B2Granted
Aqueous methods for titanating a chromium/silica catalyst
AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Kathy S. Clear, Eric D. Schwerdtfeger, Jeremy M. Praetorius
Life of this patent
Estimating the term…
Abstract
Methods for synthesizing a water-soluble titanium-silicon complex are disclosed herein. The titanium-silicon complex can be utilized to produce titanated solid oxide supports and titanated chromium supported catalysts. The titanated chromium supported catalysts subsequently can be used to polymerize olefins to produce, for example, ethylene based homopolymer and copolymers.
Claims20
An olefin polymerization process, the process comprising:
- thermally treating a titanated chromium supported catalyst to form an activated titanated chromium supported catalyst;
- and
- contacting the activated titanated chromium supported catalyst and an optional co-catalyst with an olefin monomer and an optional olefin comonomer in a polymerization reactor system under polymerization conditions to produce an olefin polymer;
- wherein the titanated chromium supported catalyst comprises:
- a solid support;
- and
- from about 0.5 to about 15 wt. % chromium, from about 1 to about 10 wt. % titanium on a surface of the solid support, and less than or equal to about 1 wt. % carbon, based on the total weight of the catalyst;
- wherein at least about 90 wt. % of the chromium is present in an oxidation state of three or less;
- and
- wherein the titanated chromium supported catalyst is characterized by:
- a total pore volume from about 0.5 to about 5 mL/g;
- a BET surface area from about 200 to about 700 m2/g;
- and
- a d50 average particle size from about 10 to about 500 microns.
11 more elements
An olefin polymerization process, the process comprising:
- thermally treating a titanated chromium supported catalyst to form an activated titanated chromium supported catalyst;
- and
- contacting the activated titanated chromium supported catalyst and an optional co-catalyst with an olefin monomer and an optional olefin comonomer in a polymerization reactor system under polymerization conditions to produce an olefin polymer;
- wherein the titanated chromium supported catalyst comprises:
- a solid support;
- and
- from about 0.1 to about 15 wt. % chromium, from about 1 to about 10 wt. % titanium on a surface of the solid support, and less than or equal to about 1 wt. % carbon, based on the total weight of the catalyst;
- wherein at least about 80 wt. % of the chromium is present in an oxidation state of three or less.
5 more elements
Dependencies are inferred from the claim text.