Process for making condensed aluminum phosphates
AssigneeHoechst Aktiengesellschaft
InventorsHorst-Dieter Wasel-Nielen, Gero Heymer, Peter Wirtz
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Abstract
The invention provides condensed aluminum phosphates which contain P.sub.2 O.sub.5 and Al.sub.2 O.sub.3 in a molar ratio equal to or greater than 1.5:1, are X-ray amorphous and have an apparent density between 50 and 200 grams/liter. They are made by spray-drying an aluminum orthophosphate solution or suspension containing P.sub.2 O.sub.5 and Al.sub.2 O.sub.3 in the molar ratio desired in the final product, in a spray tower at temperatures higher thana 250.degree.C to effect direct transformation into condensed aluminum phosphates.
Claims4
A process for spray-drying solutions or suspensions of aluminium orthophosphates containing P.sub.2 O.sub.5 and Al.sub.2 O.sub.3 in a molar ratio equal to or greater than 1.5:1 in a spraying tower at elevated temperatures which comprises spraying the said solutions or suspensions through a flame zone, the temperatures within the said spraying tower being between 300.degree. and 600.degree.C and off-gases escaping from the said tower having temperatures between 100.degree. and 500.degree.C with the resultant formation of condensed aluminium phosphates containing P.sub.2 O.sub.5 and Al.sub.2 O.sub.3 in a molar ratio equal to or greater than 1.5:1, being X-ray amorphous and having an apparent density between 50 and 200 grams/liter.
Dependencies are inferred from the claim text.