Abstract
A pilot plant for producing nitrogen-phosphorus solutions is created. Polyphosphoric acid (85 %) and ammonia hydrate (25 %) are used as the original substance. The methodology of the experiment and reagents input sequence are developed, the analysis of the resulting solution composition is carried out. The effect of phosphoric acid concentration and temperature on the conversion coefficient P2O5of the interaction with ammonia hydrate is determined, the maximum value and rational set of parameters are determined.. The reactions that occur during the interaction of reagents are determined, the mechanism and composition of the solution, which includes NH4H2PO4, (NH4)2HPO4, (NH4)2H2P2O7, (NH4)3HP2O7, (NH4)4P2O7 and H2O, is defined. In the solid phase ~ 40 % of (NH4)2HPO4 and (NH4)3xPO4 x H2O are also formed as total amount. The following rational technological parameters of the interaction process are determined: temperature, 293– 308 K; reaction time –1–4 s, mixing intensity Re = 120–200; relation NH3 x H2O to H3PO4 – 40:60; 50:50; 60:40, concentration H3PO4 – 70–85 %.
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Schedule a callMore From: Bulletin of the National Technical University "KhPI". Series: Chemistry, Chemical Technology and Ecology
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