STPP (SODIUM TRIPOLYPHOSPHATE)
Sodium triphosphate (STP), also sodium tripolyphosphate (STPP), or tripolyphosphate (TPP),[1]) is an inorganic compound with formula Na5P3O10. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. It is produced on a large scale as a component of many domestic and industrial products, especially detergents. Environmental problems associated with eutrophication are attributed to its widespread use.
Application
STPP is used in water softening, industrial cleaners, food uses, detergent, emulsifier of oil and grease, peptizing agent, deflocculating agent in oil well, sequester in cotton boiling.
| Chemical formula | Na5P3O10 |
|---|---|
| Solubility in water | 14.5 g/100 mL (25 °C) |
| Molar mass | 367.864 g/mol |
| Appearance | white powder |
| Density | 2.52 g/cm3 |
| Melting point | 622 °C (1,152 °F; 895 K) |
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