METHOD OF PREPARING SODIUM TRIPOLYPHOSPHATE Russian patent published in 2000 - IPC

FIELD: chemical industry. SUBSTANCE: method comprises neutralizing phosphoric acid with calcined soda to Na₂O:P₂O₅ molar ratio of 1.63-1.71, adding condionaling sodium pyrophosphate in amount of 0.5-4 parts per 100 parts of final product, spraying the resulting solution into particles of mixture of sodium orthophosphates or tripolyphosphate, drying and calcination of granules in rotary furnaces at 100-450 C and grinding the product. Sodium pyrophosphate is added in admixture with potassium pyrophosphate (5-10% of K₄P₂O₇ calculated for main additive Na₄P₂O₇). Method makes it possible to prepare product which has higher bulk density (1.1-1.3 g/cubic cm) and higher dissolution rate, and consumer qualities of the final product are thus improved. EFFECT: more efficient preparation method. 2 cl, 1 ex, 1 tbl