Sodium pyrophosphate anhydrous, also called sodium pyrophosphate, tetrasodium phosphate or TSPP, is a colorless transparent crystalline chemical compound with the formula Na4P2O7. It is a salt composed of pyrophosphate and sodium ions. Toxicity is approximately twice that of table salt when ingested orally. There is also a hydrated form, Na4P2O7 · 10(H2O).
Sodium pyrophosphate anhydrous is White powder or crystal. Melting point 880℃. Density 2.534g/cm3. Soluble in water and insoluble in alcohol. It’s aqueous solution is alkaline and stable below 70℃, hydrolyzes into sodium hydrogen phosphate after boiling. Can form complex with alkaline earth metal ion, liable to deliquesce.
It is applied in industries of detergents as detergent auxiliary, paper production to bleach electroplating; In food industry it is used as buffering agent, emulsifier, nutrition ingredients quality improver
Name:Sodium pyrophosphate anhydrous
CAS Registry Number:7722-88-5
Synonyms:Sodium pyrophosphate; Tetrasodium pyrophosphate; TSPP; Tetra Sodium Pyrophosphate; Tetrasodium Diphosohate
Appearance:white crystalline powder or colourless crystals
Boiling Point:93.8 °C
Storage Temperature:Keep tightly closed in a cool place in a tightly closed container.
Solubility:H2O: 0.1 M at 20 °C, clear, colorless
Usage:The active ingredient is no longer contained in any registered products.
Chemical Properties: white crystalline powder or colourless crystals
General Description: Odorless, white powder or granules. Mp: 995°C. Density: 2.53 g cm-3. Solubility in water: 3.16 g / 100 mL (cold water); 40.26 g / 100 mL boiling water. Used as a wool de-fatting agent, in bleaching operations, as a food additive. The related substance Tetrasodium pyrophosphate decahydrate (Na4P2O7 0H2O) occurs as colorless transparent crystals. Loses its water when heated to 93.8°C.
Reactivity Profile: Tetrasodium pyrophosphate is basic. Reacts exothermically with acids. Incompatible with strong oxidizing agents. Decomposes in ethyl alcohol.