FERRIC AMMONIUM CITRATE 

Ferric Ammonium Citrate is a coordination compound comprising ferric ions complexed with ammonium citrate. 
It exists in both green and brown forms and serves diverse roles across industries including pharmaceuticals, photography, food, and water treatment.

Synonyms:,Ammonium iron(III) citrate,Iron(III) ammonium citrate,Ammonium ferric citrate
Iron ammonium citrate,Brown ferric ammonium citrate (brown form),Green ferric ammonium citrate (green form)

CAS Numbers:
Brown form: 1185-57-5
Green form: 1332-05-2

Synthesis and Production Methods
General Synthesis
Ferric ammonium citrate is synthesized through the neutralization of citric acid with ammonium hydroxide, followed by reaction with ferric chloride or ferric sulfate.

Industrial Process:
Citric acid is dissolved in water.
Ammonium hydroxide is added to neutralize the acid.
Ferric salt solution is added dropwise under controlled pH and temperature.
The resulting solution is concentrated and spray-dried or crystallized.

Reaction Equation (Simplified):
FeCl3+