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US 7,803,736 B2Granted
Supported chromium catalyst and its use for preparing homopolymers and copolymers of ethylene
AssigneeBasell Polyolefine GmbH
InventorsWolfgang Rohde, Guido Funk, Andreas Haufe, Anke Bold, Neil Nadalin
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Abstract
A process for preparing supported, titanized chromium catalysts is disclosed. The process comprises A) bringing a support material into contact with a protic medium comprising a titanium compound and a chromium compound; B) optionally removing the solvent; C) optionally calcining the precatalyst obtained after step B); and D) optionally activating the precatalyst obtained after step B) or C) in an oxygen-containing atmosphere at from 400° C. to 1100° C.
Claims7
A process for preparing supported, titanized chromium catalysts, which comprises the following steps:
- A) in a single step, bringing a support material into contact with a protic medium having a water content less than 20% by weight and comprising a titanium compound and a chromium compound, wherein the protic medium comprises an alcohol selected from the group consisting of methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, and 2-ethylhexanol;
- B) optionally, removing the protic medium, thereby forming a precatalyst;
- C) optionally, calcining the precatalyst obtained after step B);
- and
- D) optionally, activating the precatalyst obtained after step B) or C) in an oxygen-containing atmosphere at from 400° C. to 1100° C.
2 more elements
Dependencies are inferred from the claim text.