Process for the preparation of crystalline calcium sodium metaphosphate
AssigneeMonsanto Company
InventorsEdward J. Griffith, John R. Jany, Vaidy R. Nathan, Toan M. Ngo
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Abstract
Crystalline calcium sodium metaphosphate is prepared by (a) forming a wet mix slurry having a composition on a dry basis equivalent to a CaO/Na.sub.2 O/P.sub.2 O.sub.5 mol percent ratio of about 24.0-34.0/12.0-18.0/50.0-60.0, with the proviso that the CaO/Na.sub.2 O mol ratio is from about 1.60 to about 2.00, (b) forming and growing product crystals of calcium sodium metaphosphate under crystal formation and growth conditions between the solid phase of the wet mix slurry and substrate crystals of calcium sodium metaphosphate.
Claims14
A process for the preparation of crystalline calcium sodium metaphosphate, which process comprises:
- (a) bringing together in aqueous media source materials for CaO, Na.sub.2 O, and P.sub.2 O.sub.5 in proportions sufficient to provide a CaO/Na.sub.2 O/P.sub.2 O.sub.5 mol percent ratio on a dry basis of about 24.0-34.0/12.0-18.0/50.0-60.0, with the proviso that the CaO/Na.sub.2 O mol ratio is from about 1.60 to about 2.00, and form a wet mix slurry containing a solid phase and an aqueous liquid phase;
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- (b) dispersing the wet mix slurry onto substrate calcium sodium metaphosphate crystals in a crystal formation and growth zone under conditions sufficient to remove the aqueous liquid phase and deposit the solid phase onto the substrate crystals and cause identically oriented continuous crystal formation and growth between the solid phase deposit and the substrate crystals to thereby form product crystals of calcium sodium metaphosphate.
Dependencies are inferred from the claim text.