C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/67
C01B 25/30 (2006.01)
Patent
CA 2038586
HOE 90/H 013 Process for the preparation of alkali metal phosphate solutions Abstract of the disclosure: Alkali metal phosphate solutions having a fluorine content of less than 20 ppm, based on P2O5, are prepared by first digesting crude phosphate using sulfuric acid, and separating the calcium sulfate from the crude phosphoric acid. An alkali metal compound is then added to the crude phosphoric acid, and the precipitated solid is filtered off. The prepurified crude phosphoric acid is neutralized to a pH of at least 7, and the solid produced during this operation is separated off. The resultant alkali metal phosphate solutions having a P2O5 content of from 10 to 30% by weight are adjusted to a pH of between 4.8 and 6.0 using phosphoric acid. The solutions are heated to from 60 to 120°C, and from 1 to 6% by weight, based on the weight of the solution, of an alkaline earth metal oxygen compound are added to the alkali metal phosphate solutions with stirring. Finally, the precipitated solid is filtered off from the alkali metal phosphate solutions after a residence time of from 0.5 to 4 hours.
Gradl Reinhard
Schimmel Gunther
Staffel Thomas
Fetherstonhaugh & Co.
Gradl Reinhard
Hoechst Aktiengesellschaft
Schimmel Gunther
Staffel Thomas
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