Sodium tripolyphosphate is an inorganic compound with the chemical formula Na5P3O10. It is an amorphous water-soluble linear polyphosphate, commonly used in food as a moisture retainer, quality improver, pH regulator, and metal chelator.
Sodium tripolyphosphate has two crystalline states: type I (high temperature type) and type II (low temperature type). The difference is that the bond length and bond angle of the two are different. The two have the same chemical properties, but the thermal stability and hygroscopicity of type I are higher than those of type II.
Sodium tripolyphosphate has the functions of chelation, suspension, dispersion, peptization, emulsification, pH buffering, etc. It can be used as the main auxiliary agent of synthetic detergents, industrial water softener, leather pretanning agent, dyeing auxiliary, organic synthesis catalyst, pharmaceutical industry dispersant and food additive, etc. In addition to exporting STPP, domestic STPP consumption is mainly concentrated in the detergent industry, food, ceramics, etc.
