Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1982-01-20
1983-09-20
Dees, Carl F.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252458, B01J 2108, B01J 2326
Patent
active
044055013
ABSTRACT:
A silica hydrogel containing chromium is aged under conditions such that at least a portion of the aging is carried out at a pH within the range of 7 to 9. The resulting hydrogel is converted to a xerogel by treating with a volatile organic liquid. The desired pH can be obtained either by adding a basic material such as ammonia to the hydrogel prior to or during the aging process or by using a chromium component which inherently gives a higher pH and/or resists the natural tendency for the pH to decrease during aging. An example of such a chromium compound is chloropentammine chromium(III)chloride. The resulting catalyst on activation is particularly suitable for olefin polymerization under conditions where higher melt flow polymer is desire
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Dees Carl F.
Phillips Petroleum Company
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