Sodium tripoly phosphate (STPP)

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Introduction

• Sodium tripolyphosphate (STPP) is a sodium salt of triphosphoric acid that has the appearance of white crystal powder. It is odorless and is water soluble.

• In a highly controlled environment, it is made by combining monosodium phosphate and disodium phosphate.

• Sodium tripolyphosphate is a strong cleaning ingredient that typically can rid dishes and fabrics of soil and spots.

• Its key function is that it allows surfactants to work at their full potential. Also, it prevents deposition of soil and acts as a pH buffer.

• It softens detergent water and can be used as a water treatment, as well. Many household cleaning products, including surface and toilet cleaners, contain STPP due to its cleaning component. 

Uses

• 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.

• STPP is a preservative for seafood, meats, poultry, and animal feeds.

• In foods, STPP is used to retain moisture.

• Other uses (hundreds of thousands of tons/year) include "ceramics, leather (as Synthetic Tanning Agent), anticaking, setting retarders, flame retardants, paper, anticorrosion pigments, textiles, rubber manufacture, fermentation, antifreeze."

Application

• Used as one of the main auxiliaries for synthetic detergent, synergist for soap, water softener, tanning agent for leather making, auxiliary for dyeing.

• As an effective dispersion agent for suspension solutions of coatings, kaolin, magnesium oxide, calcium carbonate and drilling mud etc.

• As an oil contamination resistance agent in paper production.

• 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.

• It may also serves as a softener or densifier in foodstuff industry.

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