Preparation of granular sodium tripolyphosphate hexahydrate with

Details Preparation of granular sodium tripolyphosphate hexahydrate with Preparation of granular sodium tripolyphosphate hexahydrate with

1980-06-30

1982-02-16

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2530

Patent

active

043158986

ABSTRACT:
Screen undersize anhydrous sodium tripolyphosphate particles, containing at least 2 weight percent of an alkali metal pyrophosphate, preferably sodium pyrophosphate, are moisturized with from about 145% to about 185% by weight of the theoretical amount of water to convert the anhydrous sodium tripolyphosphate into the hexahydrate form. The material is agitated during moisturization to keep the temperature below about 80.degree. C., and the moisturized material is dried at a temperature below 80.degree. C. to remove most of the free moisture. The product recovered from the drying step is a granular sodium tripolyphosphate hexahydrate product having a bulk density within the range of 0.59 g/cc to 0.64 g/cc and a friability of no higher than 30%.

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U.S. Patent Application Ser. No. 609, filed Jan. 2, 1979

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