1111216-A is referenced by 3 patents.

Alkali metal hemiphosphates, MH2PO4.H3 PO4, and mixtures with a mono alkali metal orthophosphate MH2PO4 having an M: P ratio in the mixture of between 0.5:1 and 0.75:1, are prepared by mixing anhydrous MH2PO4 with anhydrous H3PO4 in a molar proportion of MH2PO4:H3PO4 of from 1:1 to 3:1. The MH2PO4 is preferably the sodium salt, though the potassium and lithium salts may be used. The acid which has a phosphorus pentoxide content of from 70 to 76% by weight is preferably added to the phosphate which may be in the form of a spray dried powder, and the reaction may be carried out in the presence of a heel of previously prepared hemiphosphate. The temperature of the reaction mixture is preferably below 40 DEG C., but the mixture may be heated to a temperature within the range 50-70 DEG C. and then cast, by cooling the slurry.

Title
Production of alkali metal phosphates
Application Number
GB19660005058 19660204
Publication Number
1111216 (A)
Application Date
February 4, 1966
Publication Date
April 24, 1968
Inventor
Smith Raymond Anthony
Assignee
Albright & Wilson Mfg
IPC
C01B 25/00
C01B 25/30
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