Therefore, by applying pressure to the reaction system, the temperature of the ammonium phosphate solution can be elevated above its atmospheric boiling point. In this way, a pressure reactor can be operated at much lower water contents relative to atmospheric reactors because solubilities can be achieved that are not possible under atmospheric conditions. Figure 12.12 shows the Norsk Hydro fertilizer draft tube reactor used as a pressure reactor in a slurry granulation process for manufacturing a wide range of formulas such as 18-46-0 (DAP); 16-20-0 (MAP + AS); 8-26-26 and 11-33-22 (NPK).
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