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Trisodium Phosphate
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Product Introduction
Product Description
Trisodium phosphate, chemical formula Na₃PO₄, typically exists as the dodecahydrate (Na₃PO₄·12H₂O) in the form of colorless or white crystals. Industrial grades are available in various crystalline forms including anhydrous, monohydrate, and dodecahydrate. It serves as an important alkaline cleaner, water softener, metal corrosion inhibitor, and food additive, widely used in metal cleaning, food processing, textile treatment, boiler water treatment, and detergent formulations.
Working Principle
Its core functionality is based on the multivalent anionic characteristics of the phosphate ion and its alkalinity:
Saponification & Emulsification: Saponifies oils and disperses solid soils under alkaline conditions, enhancing cleaning efficacy.
Water Softening: Forms insoluble phosphate precipitates with calcium and magnesium ions in water, preventing soap scum formation.
Metal Passivation: Creates a protective iron phosphate film on metal surfaces, providing short-term corrosion protection.
pH Buffering: Maintains stable pH in the alkaline range, ensuring effective cleaning processes.
Dispersion & Suspension: Prevents soil redeposition through charge repulsion.
Specification
Trisodium Phosphate Dodecahydrate
Main Content: Trisodium phosphate dodecahydrate (Na₃PO₄·12H₂O) content is typically not less than 98.0%.
Key Parameters: pH (1% aqueous solution) is approximately 11.5-12.5; arsenic (As) content ≤0.0003%.
Appearance: Colorless or white transparent crystals, prone to efflorescence.
Product Features
Strong Alkalinity: A 1% aqueous solution has a pH of approximately 12, providing excellent saponification and cleaning power.
Good Water Solubility: Solubility increases significantly with temperature; dodecahydrate solubility can reach 28g/100mL water at 80°C.
Water Softening Capacity: Effectively sequesters calcium and magnesium ions, enhancing cleaner performance in hard water.
Metal Protection: Forms a passivation film on steel surfaces, providing inter-process rust protection.
Thermal Stability: The anhydrous form is stable at high temperatures; the dodecahydrate loses water of crystallization upon heating.
Good Compatibility: Compatible with most anionic and non-ionic surfactants as well as alkaline builders.
Environmental Considerations: Phosphate discharge must comply with local environmental regulations; may contribute to eutrophication.
Product Parameters
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