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Content available Phosphorus pentoxide from Kazakhstan phosphorus as a base for production of polyphosphoric acids (PPA) in the cascade reactors system
Milde Damian, Urbańczyk Leszek, Figura Marcin, Piś Wojciech
Polish Journal of Chemical Technology
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2019
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Vol. 21, nr 1
24--26
EN
The polyphosphoric acids (PPA) were synthesized in a cascade reactors system from P2O5  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 H3PO4 ). Polyphosphoric acids are processed in a cascade reactors system, where the in 1st  concentration of PPA is increased by addition of P2O5, while in the 2nd 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).
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