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Ammonium Ferric Citrate: Formulas and Manufacturing Process

Introduction
Ammonium ferric citrate (AFC) is a water-soluble iron complex used in pharmaceuticals, food fortification, and industrial applications. Understanding its chemical formulas and manufacturing process is essential for quality production.

Chemical Formulas of Ammonium Ferric Citrate
Ammonium ferric citrate exists in two primary forms:

1. Brown Ammonium Ferric Citrate (C6H8O7·xFe3+·yNH4+) – Contains higher iron content and is used in medical applications.
2. Green Ammonium Ferric Citrate (C6H8O7·xFe3+·yNH4+) – Contains less iron and is commonly used in food additives.

The exact formula varies based on the iron-to-citrate ratio and ammonium content.

Manufacturing Process

1. Raw Material Preparation
– Citric Acid: Sourced from fermentation of sugars.
– Ferric Hydroxide (Fe(OH)3): Derived from iron salts.
– Ammonia Solution (NH4OH): Used for neutralization.

2. Reaction Process
– Citric acid is dissolved in water and mixed with ferric hydroxide under controlled pH.
– Ammonia solution is added to form the ammonium ferric citrate complex.
– The mixture is heated to enhance solubility and reaction efficiency.

3. Crystallization & Drying
– The solution is concentrated under vacuum to initiate crystallization.
– Crystals are separated via centrifugation and dried to obtain the final product.

4. Quality Control
– Iron content, pH, and solubility are tested to ensure compliance with industry standards.

Applications
– Pharmaceuticals: Used in iron supplements.
– Food Industry: Acts as a nutrient fortifier.
– Photography: Serves as a sensitizer in blueprints.

Conclusion
Ammonium ferric citrate production requires precise chemical reactions and quality control. Understanding its formulas and manufacturing ensures high-quality output for diverse applications.