Production of maddrell salt

Details Production of maddrell salt Production of maddrell salt

C - Chemistry, Metallurgy

01

B

23/64

C01B 25/44 (2006.01) C01B 25/445 (2006.01)

Patent

CA 1084237

PRODUCTION OF MADDRELL SALT ABSTRACT OF THE DISCLOSURE: Pure Maddrell salt is produced by heating sodium phosphate to temperatures of 250 to 420°C. The sodium phosphate used as starting material is sodium trimeta- phosphate 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 for- ming polyphosphoric acid at the temperatures speci- fied, The resulting mixture is calcined over the period necessary to transform the starting material to Maddrell salt.

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