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US 11,865,505 B2Granted
Aqueous methods for titanating a chromium/silica catalyst
AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Kathy S. Clear, Jeremy M. Praetorius
Life of this patent
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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.
Claims21
A process for preparing a titanium-silicon complex, the process comprising:
- (1) contacting a silicon compound with water and an acid or a base in a solvent to form a first solution containing a partially-hydrolyzed silicon material, wherein a molar ratio of water to silicon is in a range from about 0.2:1 to about 0.8:1, a weight ratio of the acid or the base to the solvent is from about 1:2000 to about 1:20, and the silicon compound comprises a silicon alkoxide;
- and
- (2) contacting a titanium compound with the first solution containing the partially-hydrolyzed silicon material at a molar ratio of titanium to silicon from about 0.3:1 to about 0.9:1 to form a second solution containing the titanium-silicon complex.
A process for preparing a titanium-silicon complex, the process comprising:
- (1) contacting a silicon compound with water and an acid or a base in a solvent to form a first solution containing a partially-hydrolyzed silicon material, wherein a molar ratio of water to silicon is in a range from about 0.2:1 to about 0.8:1, a weight ratio of the acid or the base to the solvent is from about 1:2000 to about 1:20, the silicon compound comprises a silicon alkoxide, and the solvent comprises a ketone, an alcohol, a glycol, an ester, an ether, acetonitrile, or any combination thereof;
- and
- (2) contacting a titanium compound with the first solution containing the partially-hydrolyzed silicon material at a molar ratio of titanium to silicon from about 0.3:1 to about 0.9:1 to form a second solution containing the titanium-silicon complex.
Dependencies are inferred from the claim text.