Application scope and application of sodium tripolyphosphate Manufacturing technology

December 09, 2020

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Sodium Tripolyphosphate is mainly used as the auxiliary agent of synthetic Detergent in industry. It is an excellent auxiliary agent of detergent. It not only strengthens the detergency 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 has the properties of chelating hard metal ions: in the washing water we usually use, there are hard metal ions, which will react with the active substances in 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 these adverse effects caused by metal salts.

2. Gelatinization, emulsification and dispersion: sodium tripolyphosphate has a gelatinization effect on protein in secretion, and can reduce emulsification of fatty substances, and disperse and suspend solid particles such as sand and dust.

3. It has great alkaline buffering effect: as the auxiliary agent of synthetic detergent, sodium tripolyphosphate can keep the pH value of detergent at about 8.4, which can clean ACID dirt.

4. Keep dry: in the environment with high humidity, powdery synthetic detergent is easy to appear one by one, which brings inconvenience in the use process. After absorbing water, sodium tripolyphosphate can form a dry and flowing water compound, which can reduce the caking phenomenon, so as to keep the powder synthetic detergent dry.

Manufacturing process:

Sodium tripolyphosphate is formed by neutralization of phosphoric acid with soda ash and condensation. There are two methods of producing phosphoric acid: wet process and thermal method. Phosphoric acid is obtained by the reaction of phosphate rock with inorganic acid (usually sulfuric acid, recently used acid salt), extraction and purification. The thermal method is to calcine phosphate rock together with coke and silica in an electric furnace. The phosphate rock is reduced to phosphorus, and then oxidized and hydrated to obtain phosphoric acid.

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