Ammonia → Ammonia

Participants

Reaction Steps

A process for producing solid ammonium phosphates which process comprises reacting in the liquid phase and at a pressure of from -0.1 to +1.5 kg/cm2 in a first stage phosphoric acid containing from 35 to 60% by weight of P2O5 and up to 20% by weight of H2SO4 with gaseous ammonia, the major part of said ammonium gas having been obtained from a source outside the process, so as to produce a fluid ammonium phosphate having an NH3 :H3PO4 molar ratio which varies from 0.1:1 to 1.45:1 and a water content of from 10 to 45% by weight, passing this reaction product from the first stage to a second stage where it is reacted with gaseous ammonia at a pressure of from 0.5 to 3.5 kg/cm2 to form a fluid ammonium phosphate having an NH3 :H3PO4 molar ratio of from 0.95:1 to 1.85:1 and containing from 4 to 20% by weight of water; and discharging this fluid ammonium phosphate into a zone of lower pressure to form a solid ammonium phosphate containing from 2 to 11% by weight of water.

Provenance & Evidence