Production of Maddrell salt

Details Production of Maddrell salt Production of Maddrell salt

1978-09-25

1979-07-24

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 1516, C01B 2526

Patent

active

041623002

ABSTRACT:
Pure Maddrell salt is produced by heating sodium phosphate to temperatures of 250.degree. to 420.degree. C. The sodium phospate used as starting material is sodium trimetaphosphate or a mixture of sodium trimetaphosphate with Maddrell salt, monosodium orthophosphate or disodium pyrophosphate, the mixture containing Na and P in a molar ratio of 1:1. Prior to heating the starting material, it is admixed with 0.5 to 5 weight% of orthophosphoric acid, polyphosphoric acid, phosphorus pentoxide or at least one salt of a volatile base forming polyphosphoric acid at the temperatures specified. The resulting mixture is calcined over the period necessary to transform the starting material to Maddrell salt.

REFERENCES:
patent: 3230039 (1966-01-01), Metcalf et al.
patent: 3367737 (1968-02-01), Moore et al.
patent: 3393974 (1968-07-01), Rohlfs et al.
patent: 4029742 (1977-06-01), Sommer et al.

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