FIELD: food industry, medicine; production of detergents and cleansing agents. SUBSTANCE: initially treatment of carbonates with phosphoric acid, is carried out at room temperature. Then monosubstituted potassium phosphate is separated against filtrate by centrifugation and potassium hydroxide or thermochemical phosphoric acid is added into filtrate till its pH is 7.9-8.3. Mixture is then affected by dehydration to prepare potassium tripolyphosphate, the process takes place at 420-500 C. EFFECT: improved efficiency. 2 cl
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