CAS 7320 34 5 Tetrapotassium Pyrophosphate TKPP For Buffering Reagent Food Additive

White powder or block. 534. The melting point is 1109 ℃. Soluble in water, insoluble in ethanol. The aqueous solution is alkaline. The solubility of 100g water is 187 g at 25 ℃. The pH of 1% aqueous solution is 10.2. Potassium pyrophosphate has all the properties of other condensed phosphates.

Application:

Potassium pyrophosphate is mainly used to replace potassium cyanide for cyanide free electroplating. With the development of national industrial modernization, the demand for potassium pyrophosphate is increasing. In industry, it is also used for surface treatment, high-grade detergent, paint, detergent, dispersant, buffer, etc; In food industry, it is used as emulsifier, tissue modifier, chelating agent and quality improver. Potassium pyrophosphate can also be prepared from dipotassium hydrogen phosphate.

Production method:

In the neutralization calcination method, 30% food grade phosphoric acid is added into the neutralizer, and food grade caustic potash solution is slowly added under stirring for neutralization reaction. The pH value should be controlled at 8.4. After the reaction, the solution is heated, and activated carbon is added for decolorization. The insoluble matter is removed by filtration. The clarified filtrate is heated to 120-124 ℃ for evaporation concentration and cooled to below 20 ℃ for crystallization, Potassium dihydrogen phosphate trihydrate is obtained by centrifugation. It is heated to 120-130 ℃ to remove the crystal water and turn into anhydrous potassium dihydrogen phosphate. It is added to the calciner for calcination polymerization at 500-600 ℃ and cooled to produce edible potassium pyrophosphate products.

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