Name: Sodium Tripolyphosphate

English name: Sodium Tripolyphosphate

Other names: pentasodium triphosphate, pentasodium phosphate, sodium pyrometaphosphate, STPP, pentasodium tripolyphosphate

Chemical formula: Na5P3O10

Molecular weight: 367.86

CAS Registry Number: 7758-29-4

Melting point: 622°C

Water solubility: easily soluble in water

Density: 0.35～0.90g/cm3

External view: white powder

Application: main auxiliaries, water softeners, leather pre-tanning agents, dyeing auxiliaries, dispersants, food additives, etc.

Application direction

Sodium tripolyphosphate has the functions of chelating, suspending, dispersing, peptizing, emulsifying, pH buffering, etc. It can be used as the main auxiliary agent of synthetic detergent, industrial water softener, leather pretanning agent, dyeing auxiliary agent, organic synthesis catalyst , Pharmaceutical industry dispersant and food additives, etc. In addition to exporting STPP, domestic STPP consumption is mainly concentrated in the detergent industry, food, ceramics, etc.

In water treatment, it is mainly used as a water softener. Sodium tripolyphosphate has the performance of an ion exchanger. It can form a soluble complex Na3MP3O10 (M is a metal ion) with calcium, magnesium and iron ions in the water, which can shield calcium, Magnesium hard salt prevents the formation of calcium and magnesium deposits. In addition, because of its surface activity and strong buffering effect (the best buffering effect in the pH range of 4-14), it can also be used as a corrosion inhibitor.