Process for the preparation of substantially crystalline...

Details Process for the preparation of substantially crystalline... Process for the preparation of substantially crystalline...

C - Chemistry, Metallurgy

01

B

23/64

C01B 25/445 (2006.01) C01B 25/45 (2006.01)

Patent

CA 1262028

PROCESS FOR THE PREPARATION OF SUBSTANTIALLY CRYSTALLINE CALCIUM SODIUM METAPHOSPHATE ABSTRACT OF THE INVENTION 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) forming a dry mixture of source materials for CaO, Na2O, and P2O5 in proportions sufficient to provide a CaO/Na2O/P2O5 mol percent ratio on a dry basis of about 29.0-34.0/16.0-18.0/50.0-53.0 and (b) heating the mixture at a temperature and for a time sufficient devolatilize the mixture and calcine the resulting mixture to form the substantially crystal- line calcium sodium metaphosphate.

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