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US 2010/0075840 A1Published application
Methods of Activating Chromium Catalysts
AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Elizabeth A. Benham
Life of this patent
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Abstract
New methods for activating chromium catalysts for polymerization processes decrease the amount of time required for activation and increase catalyst activity. Rapid heating to a first temperature is followed by a first hold period before heating to a higher second temperature and maintaining the second temperature for a second hold period. In one aspect, the overall activation process takes less than 10 hours.
Claims22
A chromium catalyst activation process comprising:
- subjecting the catalyst to at least two activation stages,
- wherein a first activation stage comprises an environment previously heated to a first temperature for a first hold time in a range of from about 1 minute to about 30 hours, and
- wherein a second activation stage comprises an environment heated to a second temperature for a second hold time in a range of from about 1 minute to about 30 hours.
A chromium catalyst activation process comprising:
- introducing a chromium catalyst to a heating zone preheated to a first temperature;
- holding the heating zone at the first temperature for a first hold time in a range of from about 1 minute to about 30 hours;
- increasing the heating zone to a second temperature greater than the first temperature;
- and
- holding the heating zone at second temperature for a second hold time in a range of from about 1 hour to about 30 hours.
2 more elements
A chromium catalyst activation process comprising:
- introducing a chromium catalyst to a first heating zone preheated to a first temperature;
- holding the catalyst within the first heating zone for a first hold time in a range of from about 1 minute to about 30 hours;
- introducing the chromium catalyst to a second heating zone preheated to a second temperature, wherein the second temperature is greater than the first temperature;
- and
- holding the catalyst within the second heating zone for a second hold time in a range of from about 1 minute to about 30 hours.
2 more elements
Dependencies are inferred from the claim text.