TSPP can be produced by the neutralization of phosphoric acid with sodium hydroxide with mol proportions of 2:1.
Food grade TSPP exists as two forms, and follows the corresponding chemical formula:
TSPP Anhydrous: Na4P2O7
TSPP Decahydrate: Na4P2O7 · 10H2O
Specification
Other names
Tetrasodium disphosphate
Tetrasodium phosphate
Sodium pyrophosphate
CAS number 7722-88-5
Appearance white powder or granular powder
Solubility Soluble in water, insoluble in ethanol