Disodium phosphate - Sodium hydrogen phosphate NEW

Disodium Phosphate
Anhydrous, Dihydrate, Dodecahydrate
Food Grade & Technical Grade

Manufacturer: Jiangsu Khonor Chemicals Co., Limited
CAS Numbers:

• Anhydrous: 7558-79-4

• Dihydrate: 10028-24-7

• Dodecahydrate: 13573-18-7
  EC Numbers:

• Anhydrous: 231-448-7

• Dihydrate: 231-448-7

• Dodecahydrate: 236-879-6
  E Numbers (Food Grade): E339(ii)

Specifications

1. Anhydrous Disodium Phosphate

2. Disodium Phosphate Dihydrate

3. Disodium Phosphate Dodecahydrate

Production Process

Disodium phosphate is manufactured through the neutralization reaction of phosphoric acid with sodium carbonate or sodium hydroxide, followed by crystallization and drying:

1. Reaction:
   H₃PO₄ + Na₂CO₃ → Na₂HPO₄ + CO₂ + H₂O
   or
   H₃PO₄ + 2NaOH → Na₂HPO₄ + 2H₂O

2. Crystallization: Cooling and controlled crystallization for dihydrate or dodecahydrate forms.

3. Drying: To obtain anhydrous form by heat treatment.

4. Purification & Quality Control

Mechanism of Action

Disodium phosphate acts as a pH buffer, emulsifier, chelating agent, and reactive intermediate. It maintains the alkalinity of a solution and regulates acidity in foods or chemical reactions. In water treatment, it softens water by binding to calcium and magnesium ions.

Applications

● Food Industry (E339(ii)):

• Buffering agent in cheese, milk, beverages

• Emulsifier in processed meats

• Preservative and pH control in baked goods and sauces

● Detergent Industry:

• Water softening agent

• Alkalinity booster

• Builder in phosphate-based formulations

● Water Treatment:

• Scale inhibition in boilers

• Corrosion control

• Chelation of metal ions

● Textile and Dyeing:

• Water conditioning

• Dye fixation aid

● Pharmaceuticals and Nutraceuticals:

• Buffer in oral rehydration salts

• Stabilizer in medicinal formulations

● Ceramics & Electroplating:

• Electrolyte additive

• Flux agent

Packaging

Storage & Handling

• Store in a cool, dry, and well-ventilated area

• Avoid moisture and direct sunlight

• Keep away from incompatible substances such as strong acids

Safety & Transport

• Non-hazardous material under transport regulations (UN/IMDG/IATA)

• Avoid inhalation or contact with eyes and skin

• Wear appropriate protective equipment during handling

• In case of contact: rinse thoroughly with water

Shelf Life: 2 years under proper storage conditions