Sodium tripolyphosphate (STPP) is mainly used as the auxiliary of synthetic detergent in industry. It is an excellent auxiliary of detergent. It not only strengthens the decontamination ability of detergent and cleans our living environment, but also can be used in mining, petroleum, papermaking, metallurgy and water treatment.
Its main functions are as follows:
1. It can chelate hard metal ion: In the washing water that is usually used, hard metal ions are included , and they will react with the active substances in the detergent to form metal salts. This not only increases the use of detergent, but also darkens the color of the washed items. This property of sodium tripolyphosphate can reduce the adverse effects of metal salts.
2. Gelatinization, emulsification and dispersion: sodium tripolyphosphate has gelatinization effect on protein in secretion, emulsification effect on reducing fat substances, and dispersion and suspension effect on sand, dust and other solid particles outside.
3. It has great alkaline buffering effect: as the auxiliary of synthetic detergent, sodium tripolyphosphate can keep the pH value of detergent at about 8.4, which can clean up acidic dirt.
4. Keep dry: in the environment of high humidity, powdery synthetic detergent is easy to appear block by block, which brings inconvenience in the process of use. Sodium tripolyphosphate can form a dry flowing water compound after absorbing water, which can reduce the blocking phenomenon, so as to keep the dry of powdery synthetic detergent.
Sodium tripolyphosphate (STPP) is formed by neutralization of phosphoric acid with soda ash and condensation.
There are 2 ways to produce phosphoric acid: wet method and hot method.
Wet process is the reaction of phosphate rock with inorganic acid (sulfuric acid is usually used, acid salt has been used recently), then phosphoric acid is obtained by extraction and purification.
In the thermal method, phosphate rock is roasted together with coke and silica in an electric furnace. Phosphate rock is reduced to phosphorus, and then oxidized, hydrated to obtain phosphoric acid.
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1. Phosphoric Acid
2. Ammonium Phosphates
3. Potassium Phosphates
4. Sodium Phosphates
5. Calcium Phosphates
6. Urea Phosphate