How is Di-Ammonium Phosphate prepared?

Answer 1

manufacturing procedure of di ammonium phosphate (FOOD GRADE)

raw materials :

pure phosphoric acid (85%)

ammonia gas cylinder

water with nil calcium content

procedure :

in SS vessel

take pure phosphoric acid in a measured quantity (Sp. gravity - 1.67)

add water under stirring to reduce the Sp. gravity up to 1.35 ,

then purging the ammonia gas directly into bottom of the vessel

consistently measure the pH of the liquid

once the pH raise upto 8.00

stop the purging

and allow to cool for room temperature.

(exothermic reaction)

give some more time to form crystals

then centrifuge the material

crystal to be pack

and the mother liquor reuse for next batch to reduce the acid quantity

while making the batch pl. use the ammonia mask/ suitable and take follow safety aspects.