Mixed acid

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Mixed acid is a mixture of sulphuric acid (61 %) and nitric acid (36 %) used for nitration. Mixed acid process for nitrophosphate production There are two processes used for making nitrophosphate fertilizers - the Odda process and the mixed acid process. Ammonium phosphate nitrate (APN), nitric phosphates and ammonium nitrophosphates are nitrophosphate fertilizers produced by reacting phosphate rock with nitric acid. In the mixed acid process, calcium nitrate does not precipitate and separate. The water-solubility of phosphate is increased by adding phosphoric acid to decrease the CaO:P2O5 ratio. The mixed acid route covers a range of formulations with the nitrogen to phosphorus (N:P2O5) ratio ranging between0.5 and 2.0.