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The polyphosphoric acids (PPA) were synthesized in a cascade reactors system from P 2 O 5  obtained from the burning of Kazakh phosphorus. Presented system provides guidelines for the PPA production process using phosphoric acids only at concentrations above 100% (in conversion to H 3 PO 4 ). Polyphosphoric acids are processed in a cascade reactors system, where the in 1 st  concentration of PPA is increased by addition of P2O 5 , while in the 2 nd  reactor PPA is diluted with the use of 85% phosphoric acid. Produced PPA can be obtained in the 100–118% range and is characterized by high chemical purity due to the reduction of the corrosivity of the reaction, which results in very low content of iron (below 2 ppm Fe).

Phosphorus pentoxide from Kazakhstan phosphorus as a base for production of polyphosphoric acids (PPA) in the cascade reactors system