Explain the manufacturing process of Di-Ammonium Phosphate.

Explain the manufacturing process of Di-Ammonium Phosphate. 
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Answer :

Di Ammonium Phosphate 

Anhydrous and dry ammonia and phosphoric acid are charged into the first reactor. About 80% neutralization is done in the first reactor. Further ammonia is added to second reactor. So conversion to the di-ammonium salt is obtained. The reaction is exothermic and hence due to heat of reaction the excess ammonia vapors are given out this are collected at the top of the tank and recharged. This cuts ammonia losses. The slurry obtained in second reactor is allowed to pass to a rotary adiabatic dryer in which moisture is reduced to less than 1%. The bed of dry particles is recycled by moving them through rotating drum granulator. The particles are screamed and dried further white crystalline solid material is obtained. 

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Reaction

NH3 + H3PO4 NH4H2PO4

NH3 + NH4H2PO (NH4)2HPO4

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