Monsanto Company

John R Jany

Vaidy R Nathan

Edward J Griffith

Toan M Ngo

James E Downes

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.

Process for the preparation of crystalline calcium sodium metaphosphate

Substantially crystalline calcium sodium metaphosphate having a degree of crystallinity from about 60% to about 75% as determined from density and differential thermal analysis measurements is prepared by (a) bringing together in water 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 29.0-34.0/16.0-18.0/50.0-53.0 and form a wet mix slurry containing a solid phase and an aqueous liquid phase and (b) heating the wet mix slurry at a temperature and for a time sufficient to remove the aqueous liquid phase and calcine the resulting solid phase to form the substantially crystalline calcium sodium metaphosphate.

Process for the preparation of substantially crystalline calcium sodium

Asbestiform crystalline calcium sodium metaphosphate fiber 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, and (c) fiberizing the product crystals of calcium sodium metaphosphate.

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Ellisville, MO, United States of America

John R Jany