Sodium Triphosphate, STPP 90%, 94%, 95%, Food Grade, Tech Grade, in Detergents, Food Applications

CAS No.: 7758-29-4
Type: Sodium Tripolyphosphate
Grade Standard: Industrial Grade
CAS No: 7758-29-4
Mf: Na5p3o10
Appearance: White Powder or White Granular
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Basic Info.

Model NO.
90%, 94%, 95%
Transport Package
Plastic Bag
Specification
SGS ISO
Trademark
LY
Origin
Shandong
HS Code
28353190
Production Capacity
60000tons/Month

Product Description

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Sodium triphosphate

Sodium triphosphate (STP, sometimes STPP or sodium tripolyphosphate or TPP, )
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 widespreaduse.

Preparation and properties

Sodium tripolyphosphate is produced by heating a stoichiometric mixture of disodium phosphate, Na2HPO4, and monosodium phosphate, NaH2PO4, under carefully controlled conditions.

2 Na2HPO4 + NaH2PO4 Na5P3O10 + 2 H2O

In this way, approximately 2 million tons are produced annually.

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]5-. Many related di-, tri-, and polyphosphates are known including the cyclic triphosphate P3O93-. It binds strongly to metal cations as both a bidentate and tridentate chelating agent.

Uses

In detergents
The majority of STPP is consumed as a component of commercial detergents. It serves as a "builder, " industrial jargon for a water softener. In hard water (water that contains high concentrations of Mg2+ and Ca2+), detergents are deactivated. Being a highly chargedchelating agent, TPP5- binds to dications tightly and prevents them from interfering with the sulfonate detergent.

Food applications
STPP is a preservative for seafood, meats, poultry, and animal feeds. It is common in food production as E number E451. In foods, STPP is used as an emulsifier and to retain moisture. Many governments regulate the quantities allowed in foods, as it can substantially increase the sale weight of seafood in particular. The United States Food and Drug Administration lists STPP as "generally recognized as safe. ".

Other uses
Other uses (hundreds of thousands of tons/year) include "ceramics, leather tanning(as masking agent and synthetic tanning agent - SYNTAN), anticaking, setting retarders, flame retardants, paper, anticorrosion pigments, textiles, rubber manufacture, fermentation, antifreeze.
NO.IndexesIndustrial Grade          Food Grade
1Assay Na5P3O10 % ≥94.0                      95.0
2P2O5 % ≥57.0            57.0
3Water Insoluble Matter %≤0.1            0.05
4Iron(Fe) %≤0.007             0.01
5PH value(1%water solution)9.2-10.0            9.5-10.0
6Heavy Metal (as Pb) %≤              0.001
7Arsenic (As) %≤              0.0003
8Fluoride (F) %≤              0.003
9Whiteness %≥90.0             90.0

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