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[Chemical Knowledge]：Manufacturing method and process of ammonium chloride

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Manufacturing method
of ammonium chloride
Ammonium chloride is an inorganic compound, which is widely used in chemical industry, medicine, agriculture and other fields. In the field of chemical production raw materials, the manufacturing methods of ammonium chloride mainly include the following:

1. ammonia method

ammonia method is to react ammonia water with hydrochloric acid to generate ammonium chloride crystals, after centrifugal separation, drying and other processes to produce ammonium chloride products. The specific steps are as follows:

1. mixing ammonia water and hydrochloric acid according to a certain proportion, and controlling the pH value in an appropriate range to generate a saturated solution of ammonium chloride.
2. The saturated solution is sent into a crystallizer, and ammonium chloride is crystallized and precipitated by cooling and stirring.
3. The crystallized material is centrifuged to obtain ammonium chloride crystals and mother liquor.
4. The ammonium chloride crystals are dried to obtain the final ammonium chloride product.

2. ammonium chloride mother liquor circulation method

ammonium chloride mother liquor circulation method is to recycle the mother liquor in the process of ammonium chloride production to reduce waste liquid discharge and reduce production costs. The specific steps are as follows:

1. Ammonia and hydrochloric acid are mixed according to a certain proportion to generate a saturated solution of ammonium chloride.
2. The saturated solution is sent into a crystallizer, and ammonium chloride is crystallized and precipitated by cooling and stirring.
3. The crystallized material is centrifuged to obtain ammonium chloride crystals and mother liquor.
4. Return the mother liquor to the mixing step and continue to react with fresh starting material to form ammonium chloride crystals.
5. The ammonium chloride crystals are dried to obtain the final ammonium chloride product.

3. double decomposition method

double decomposition method is the reaction of ammonium carbonate and hydrochloric acid to produce ammonium chloride and carbon dioxide gas, after filtration, drying and other processes to produce ammonium chloride products. The specific steps are as follows:

1. Ammonium carbonate and hydrochloric acid are mixed according to a certain proportion to react to generate ammonium chloride and carbon dioxide gas.
2. The solution after the reaction is filtered to remove unreacted ammonium carbonate and impurities.
3. The filtrate is concentrated by evaporation to give a saturated solution of ammonium chloride.
4. The saturated solution is sent into a crystallizer, and ammonium chloride is crystallized and precipitated by cooling and stirring.
5. The crystallized material is centrifuged to obtain ammonium chloride crystals and mother liquor.
6. The ammonium chloride crystals are dried to obtain the final ammonium chloride product.

The above are several main manufacturing methods of ammonium chloride, and different methods have different advantages and disadvantages and scope of application. In actual production, the appropriate manufacturing method can be selected according to the specific situation to maximize product quality and production efficiency. At the same time, in order to ensure product quality and environmental protection requirements, it is also necessary to comprehensively monitor and manage the production process to ensure the stability and reliability of the production process.

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