Product Description
Sodium Tripolyphosphate (STPP, CAS: 7758-29-4), also called Pentasodium Tripolyphosphate, is an inorganic polyphosphate with the formula Na?P?O??. It is a white crystalline powder/granular solid, odorless, with good chelating and dispersing properties, widely used in multiple industries.
Uses
Detergent Industry: Core auxiliary in synthetic detergents, softens water and enhances decontamination.
Food Industry: Food additive (INS 451(i)) as water-retaining agent and quality improver for various foods.
Water Treatment Industry: Scale inhibitor and water softener for boiler and circulating cooling water systems.
Other Industries: Slurry adjuster in ceramics, dispersant in textile/papermaking, and feed additive.
Molecular Formula & Structure
- Molecular Formula: Na?P?O??
- Molecular Weight: 367.86 g/mol
- CAS Number: 7758-29-4
- Synonyms: STPP; Pentasodium Tripolyphosphate
- Chemical Structure: Composed of five sodium ions and one tripolyphosphate anion, with good water solubility.
Physical & Chemical Properties
- Appearance: White crystalline powder/granular solid, odorless, good fluidity.
- Density: 2.52 g/cm3; Melting Point: 622°C (dec.); pH: 9.2-10.0 (1% aqueous solution).
- Solubility: Easily soluble in water, insoluble in non-polar organic solvents.
- Stability: Stable at room temperature, slightly hygroscopic, incompatible with strong acids.
Synthesis & Storage
- Synthesis: Produced by thermal condensation of neutralized phosphates (sodium dihydrogen phosphate and disodium hydrogen phosphate).
- Storage: Store in a cool, dry, well-ventilated area at 15–25°C, keep tightly sealed to prevent moisture absorption.
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