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[Chemical Knowledge]：Production and manufacturing method and process flow of sodium dihydrogen phosphate

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Sodium dihydrogen phosphate (NaH2PO4) is an important chemical, widely used in food, medicine, printing and dyeing, metallurgy and other fields. In the field of raw materials for chemical production, the main manufacturing methods of sodium dihydrogen phosphate are as follows:

1. Preparation of

by wet-process phosphoric acid method Preparation of sodium dihydrogen phosphate by wet-process phosphoric acid method is the use of phosphate ore, sulfuric acid and soda ash as raw materials, after reaction to obtain sodium dihydrogen phosphate. The specific steps are as follows:

(1) The phosphate rock is crushed to a certain particle size and reacted with sulfuric acid to generate phosphoric acid.

(2) Soda ash is added to phosphoric acid to react to generate sodium dihydrogen phosphate and sodium sulfate.

(3) filtration, crystallization, centrifugal separation, drying, sodium dihydrogen phosphate product.

this method has the advantages of easy access to raw materials and simple process, a large amount of waste residue and waste gas will be produced in the production process, which will cause certain pollution to the environment.

2. Preparation of

by trisodium phosphate method The preparation of sodium dihydrogen phosphate by trisodium phosphate method uses trisodium phosphate and sulfuric acid as raw materials to obtain sodium dihydrogen phosphate through reaction. The specific steps are as follows:

(1) Trisodium phosphate is added to sulfuric acid to react to generate sodium dihydrogen phosphate and sodium sulfate.

(2) filtration, crystallization, centrifugal separation, and drying to obtain sodium dihydrogen phosphate product.

this method has the advantages of high yield and good product quality, a large amount of sulfuric acid is needed in the production process, and the cost is high.

3. Preparation of
by ion exchange method The preparation of sodium dihydrogen phosphate by
ion exchange method uses ion exchange resin and phosphoric acid as raw materials to obtain sodium dihydrogen phosphate through ion exchange reaction. The specific steps are as follows:

(1) Phosphoric acid is passed through an ion exchange resin, and sodium ions in the resin are exchanged with hydrogen ions in the phosphoric acid to generate sodium dihydrogen phosphate and sodium hydroxide. The resulting sodium dihydrogen phosphate solution is crystallized

(2), centrifuged, and dried to obtain a sodium dihydrogen phosphate product.

this method has the advantages of high product purity and simple operation, the resin needs to be regenerated regularly and the cost is high.

To sum up, the above three methods can be used to prepare sodium dihydrogen phosphate, but each has its own advantages and disadvantages. In actual production, the appropriate preparation method should be selected according to the specific situation. At the same time, in order to reduce production costs and improve product quality, it is necessary to continuously optimize production processes and equipment, improve production automation, strengthen environmental management in the production process, and promote the sustainable development of sodium dihydrogen phosphate manufacturing.

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