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

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The manufacturing method

of calcium dihydrogen phosphate Calcium dihydrogen phosphate is an important chemical product, which is widely used in food, feed, medicine, agriculture and other fields. Its manufacturing methods mainly include the following:

1. neutralization method

neutralization method is a method of reacting phosphoric acid with limestone or calcium hydroxide to generate calcium dihydrogen phosphate and water. The specific steps are as follows:

1. mix phosphoric acid with limestone or calcium hydroxide according to a certain proportion and add it into the reactor.
2. At a certain temperature, the neutralization reaction is carried out to generate calcium dihydrogen phosphate and water.
3. Through filtration, washing, drying and other processes, the calcium dihydrogen phosphate product is obtained. The advantages of

neutralization method are simple process and convenient operation, but the obtained product has low purity and contains more impurities.

2. crystallization method

crystallization method is by controlling the solution temperature, concentration, pH value and other factors, so that the calcium dihydrogen phosphate from the solution crystallization method. The specific steps are as follows:

1. Mix phosphoric acid with an appropriate amount of water to make a phosphoric acid solution.
2. Add an appropriate amount of calcium hydroxide to the phosphoric acid solution and adjust the pH value to 2.0-2.5 to make the calcium dihydrogen phosphate in the solution reach a saturated state.
3. Control a certain temperature and concentration, so that calcium dihydrogen phosphate crystallization precipitation.
4. Through centrifugal separation, washing, drying and other processes, the calcium dihydrogen phosphate product is obtained. The advantage of

crystallization method is that the purity of the obtained product is higher, but the operation is more complicated and many factors need to be controlled.

3. ion exchange method

ion exchange method is the use of ion exchange resin ions and ions in the solution to obtain calcium dihydrogen phosphate method. The specific steps are as follows:

1. the phosphoric acid solution through a column filled with cation exchange resin, so that the hydrogen ions in the solution and the metal ions in the resin are exchanged to generate the corresponding phosphate.
2. The resulting phosphate solution is mixed with an appropriate amount of calcium hydroxide solution to form a calcium dihydrogen phosphate precipitate.
3. Through filtration, washing, drying and other processes, the calcium dihydrogen phosphate product is obtained. The advantage of

ion exchange method is that it can obtain higher purity products, but the equipment investment is larger and the operating cost is higher.

of the above methods have their own advantages and disadvantages, according to the specific production needs and conditions, select the appropriate method for the manufacture of calcium dihydrogen phosphate. No matter which method is used, it is necessary to strictly control the operating conditions of each process to ensure product quality and output.

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