Disodium Phosphate
Anhydrous, Dihydrate, Dodecahydrate
Food Grade & Technical Grade
Manufacturer: Jiangsu Khonor Chemicals Co., Limited
CAS Numbers:
Specifications
1. Anhydrous Disodium Phosphate
| Parameter | Food Grade Specification | Technical Grade Specification |
|---|
| Assay (Na₂HPO₄, % min) | 98.0 – 100.5 | ≥97.0 |
| pH (1% solution) | 8.8 – 9.2 | 8.5 – 9.5 |
| Water Insoluble (%) | ≤0.2 | ≤0.5 |
| Heavy Metals (Pb, ppm) | ≤10 | ≤20 |
| Arsenic (As, ppm) | ≤1.0 | ≤5.0 |
| Fluoride (ppm) | ≤10 | ≤50 |
| Loss on Ignition (%) | ≤1.0 | ≤2.0 |
2. Disodium Phosphate Dihydrate
| Parameter | Food Grade Specification | Technical Grade Specification |
|---|
| Assay (Na₂HPO₄·2H₂O, %) | 98.0 – 100.5 | ≥97.0 |
| pH (1% solution) | 8.6 – 9.2 | 8.0 – 9.5 |
| Water Insoluble (%) | ≤0.2 | ≤0.5 |
| Heavy Metals (Pb, ppm) | ≤10 | ≤20 |
| Arsenic (As, ppm) | ≤1.0 | ≤5.0 |
| Fluoride (ppm) | ≤10 | ≤50 |
| Loss on Ignition (%) | 20.0 – 21.0 | ≤22.0 |
3. Disodium Phosphate Dodecahydrate
| Parameter | Food Grade Specification | Technical Grade Specification |
|---|
| Assay (Na₂HPO₄·12H₂O, %) | 98.0 – 101.0 | ≥97.0 |
| pH (1% solution) | 8.5 – 9.2 | 8.0 – 9.5 |
| Water Insoluble (%) | ≤0.2 | ≤0.5 |
| Heavy Metals (Pb, ppm) | ≤10 | ≤20 |
| Arsenic (As, ppm) | ≤1.0 | ≤5.0 |
| Fluoride (ppm) | ≤10 | ≤50 |
| Loss on Ignition (%) | 61.0 – 63.5 | ≤64.0 |
Production Process
Disodium phosphate is manufactured through the neutralization reaction of phosphoric acid with sodium carbonate or sodium hydroxide, followed by crystallization and drying:
Reaction:
H₃PO₄ + Na₂CO₃ → Na₂HPO₄ + CO₂ + H₂O
or
H₃PO₄ + 2NaOH → Na₂HPO₄ + 2H₂O
Crystallization: Cooling and controlled crystallization for dihydrate or dodecahydrate forms.
Drying: To obtain anhydrous form by heat treatment.
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 Treatment:
● Textile and Dyeing:
Water conditioning
Dye fixation aid
● Pharmaceuticals and Nutraceuticals:
● Ceramics & Electroplating:
Electrolyte additive
Flux agent
Packaging
| Packaging Type | Weight |
|---|
| Kraft Paper Bag with PE Liner | 25 kg / 50 lb |
| Jumbo Bags (optional) | 500 kg / 1000 kg |
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
China
