The Role Of Sodium Pyrophosphate

Electroplating industry is used to prepare electroplating solution, which can form complex with iron. It is used as degreasing agent and bleaching agent in wool spinning industry. The paper industry is used for bleaching paper and plant fibers. Printing and dyeing industry is used as auxiliaries in printing and dyeing and fine bleaching. It can be used as toothpaste additive in daily chemical industry. It can form colloid with calcium hydrogen phosphate and play a stabilizing role. It can also be used in synthetic detergent and shampoo production. As a water softener in water treatment. As rust remover in machining. It is used as dispersant and emulsifier in chemical production. It can also be used in water treatment agent, oil drilling and other aspects, as quality improver, emulsifier, buffer, chelating agent in food industry.

Sodium pyrophosphate not only has the function of softening water, but also can dissolve insoluble salts of calcium and magnesium. For example, the dirt formed by insoluble calcium soap or other metal soap is mixed in the clothing fiber. It can make it dissolve again and improve the decontamination ability. In addition, sodium pyrophosphate has the function of anti flocculation, which makes the oil emulsify. This is called the gelling property. It can also make the surfactant solution further reduce the surface tension and interfacial tension, and play the role of washing aid.

Sodium pyrophosphate, molecular formula Na4P2O7 · 10h2o, relative molecular weight 446.07. Also known as tetrasodium diphosphate, there are anhydrous and decahydrate. Decahydrate is colorless or white crystalline or crystalline powder, anhydrous substance is white powder, soluble in water, insoluble in ethanol and other organic solvents. It has strong complexation ability with Cu2 +, Fe +, Mn2 + and other metal ions. The aqueous solution is stable below 70 ℃, and hydrolyzes to disodium hydrogen phosphate after boiling.