Production of aluminum phosphate from concentrated mass
First Claim
1. A method for producing aluminum orthophosphate comprising combining an aluminum salt with a source of added orthophosphate ions in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, combining the resulting composition with a base to form aluminum phosphate hydrogel still in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, and removing water from said hydrogel to produce a xerogel.
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Abstract
Aluminum orthophosphate is prepared by combining a source of orthophosphate ions with an aluminum salt to form a concentrated mass, gelling, and thereafter converting the resulting hydrogel to a xerogel by removing water. The resulting aluminum phosphate is particularly suited for use as a base for a chromium olefin polymerization catalyst.
116 Citations
20 Claims
- 1. A method for producing aluminum orthophosphate comprising combining an aluminum salt with a source of added orthophosphate ions in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, combining the resulting composition with a base to form aluminum phosphate hydrogel still in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, and removing water from said hydrogel to produce a xerogel.
- 17. A catalyst produced by combining an aluminum salt with a source of orthophosphate ions in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, combining the resulting composition with a base to form aluminum phosphate hydrogel still in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, and removing water to form a xerogel, wherein 0.001 to 10 weight percent chromium based on the weight of the xerogel is introduced at or prior to the xerogel stage, and thereafter activating at an elevated temperature in an oxidizing ambient.
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19. An aluminum orthophosphate supported catalyst produced by combining an aluminum salt with a source of phosphate ions in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, combining the resulting composition with a base to form aluminum phosphate hydrogel still in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, and removing water to form a xerogel and activating at an elevated temperature, the thus activated aluminum phosphate containing in addition 0.001 to 10 weight percent vanadium based on the weight of the xerogel.
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20. A catalyst produced by combining an aluminum salt with a source of orthophosphate ions in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, combining the resulting composition with a base to form aluminum phosphate hydrogel still in a concentrated mass containing 40 weight percent or less water based on the weight of said aluminum salt, and removing water to form a xerogel, activating at an elevated temperature and introducing a zerovalent chromium compound under anhydrous conditions.
Specification