Acid gelling aluminum phosphate from concentrated mass and catalyst containing same
AssigneePhillips Petroleum Company
InventorsMax P. McDaniel, Marvin M. Johnson
Life of this patent
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Abstract
Aluminum orthophosphate is prepared by combining a source of phosphate ions with an aluminum salt to form a concentrated mass, combining with sufficient neutralizing agent to partially neutralize, and aging until gellation occurs. The resulting aluminum phosphate is particularly suited for use as a base for a chromium olefin polymerization catalyst.
Claims26
A method for producing aluminum orthophosphate comprising combining an aluminum salt with a source of orthophosphate ions in a concentrated mass, combining said concentrated mass with a neutralizing agent, said neutralizing agent being used in an amount insufficient to cause immediate gellation, and aging until gellation occurs to form a hydrogel.
A method for producing a polymerization catalyst comprising combining an aluminum salt with a source of orthophosphate ions in a concentrated mass, combining said concentrated mass with a neutralizing agent, said neutralizing agent being used in an amount insufficient to cause immediate gelation, and aging until gelation occurs to form an aluminum orthophosphate hydrogel, removing water from said hydrogel to produce a xerogel, thereafter activating at an elevated temperature in an oxidizing ambient, and wherein a metal component selected from chromium compounds and vanadium compounds in an amount sufficient to give 0.001 to 10 weight percent chromium or vanadium based on the weight of the xerogel is introduced prior to said activating.
Dependencies are inferred from the claim text.