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

Read： 1979 Time：20months ago Source：Transform the World with Simplicity

Ammonium bicarbonate (NH4HCO3) is an important inorganic chemical product, which is widely used in chemical fertilizer, food, medicine and other fields. In the field of raw materials for chemical production, the manufacturing methods of ammonium bicarbonate mainly include the following:

1. ammonia water absorption carbon dioxide
method This method is to react ammonia water with carbon dioxide gas under certain conditions to generate ammonium bicarbonate crystals. The specific steps are as follows:
ammonia water is added into the reaction kettle, and the temperature is controlled within a suitable range.
(2) carbon dioxide gas is introduced to fully react ammonia water with carbon dioxide to generate ammonium bicarbonate solution.
(3) The ammonium bicarbonate solution is cooled and crystallized to obtain ammonium bicarbonate crystals.
(4) The crystals are centrifuged and dried to obtain a finished product of ammonium bicarbonate.

the advantages of this method are simple process and convenient operation, it should be noted that the appropriate temperature and pH value need to be controlled during the reaction process to ensure that the generated ammonium bicarbonate crystal has high purity and good quality.

2. ammonium bicarbonate crystallization method
this method is through a certain concentration of ammonia and bicarbonate solution mixed, under suitable conditions reaction to generate ammonium bicarbonate crystal. The specific steps are as follows:
ammonia and bicarbonate solution of a certain concentration are mixed according to a certain proportion.
(2) Controlling the temperature and pH of the mixed liquid to precipitate ammonium bicarbonate.
(3) The crystals are centrifuged and dried to obtain finished ammonium bicarbonate.

The advantage of this method is that the size and purity of crystals can be controlled by adjusting the concentration, temperature and pH value of the solution, which is suitable for large-scale production.

3. Ion exchange method
This method is to exchange ammonium ions in ammonia water and bicarbonate ions in carbonate solution through ion exchange resin to generate ammonium bicarbonate solution. The specific steps are as follows:
ammonia water passes through an ion exchange resin column to exchange ammonium ions with hydrogen ions on the resin to generate ammonium hydroxide solution.
(2) The carbonate solution is passed through the same ion exchange resin column to exchange bicarbonate ions with hydroxide ions on the resin to generate a sodium bicarbonate solution.
(3) Ammonium hydroxide solution and sodium bicarbonate solution are mixed and reacted to generate ammonium bicarbonate solution.
(4) The ammonium bicarbonate solution is cooled and crystallized to obtain ammonium bicarbonate crystals.
(5) The crystals are centrifuged and dried to obtain a finished product of ammonium bicarbonate.

The advantage of this method is that it can realize the production of high purity and high yield of ammonium bicarbonate by selecting ion exchange resin and controlling the concentration and flow rate of solution, but the equipment investment is large and the operation is complicated.

To sum up, there are many manufacturing methods of ammonium bicarbonate, and different methods have their own advantages and disadvantages. They should be selected according to specific production conditions and needs. No matter which method is used, it is necessary to control the appropriate process parameters to ensure product quality and production efficiency.

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