Description
Sodium Tripolyphosphate, STPP
MF: Na5P3O*0
Molecular Weight: **7.*6
CAS No.: ********4
Melting Point: **2 °C
Appearance: White crystal powder
Properties: STPP is a colourless salt, which exists both in
anhydrous form and as the hexahydrate. The anion can be
described as the pentanionic chain [O3POP(O)2OPO3]*-. Many
related di-, tri-, and polyphosphates are known including the
cyclic triphosphate P3O**-. It binds strongly to metal cations
as both a bidentate and tridentate chelating agent.
STPP is white powder. The surface density is 0.***0.9/cm3 and the
melting point is **2°c, it is free soluble in water.
The aqueous solution appears acid. It is a kind of inorganic
surface active agent.
Application:
1). It is used as one of the main auxiliaries agent for synthetic
detergent, synergist for soap.
2). Tanning agent for leather leather, auxiliary for
dyeing.
3). Softener for water in industry.
4). An effective dispersion agent for suspension treatment of
painting, kaolin, magnesium oxide, calcium carbonate
and drilling mud etc.
5). It also can be used as resistance agent of the oil
contamination in paper production.
6). In foodstuff industry it is used as quality improver in the
process of canned food, fruit juice drinks. Foodstuffs
from milk or soybeans, it may tender the meat in canned ham
and soften the skin of horse bean in canned horse bean.
