Production of Potassium Nitrate by Double Decomposition Air Cooling and Crystallization
A technology of cooling crystallization and production process, which is applied in the preparation of alkali metal nitrates, etc., can solve the problems of large consumption of cooling water and steam, poor quality of ammonium chloride products, and low output of potassium nitrate, etc. Conversion rate, the effect of improving product purity
Inactive Publication Date: 2016-08-24
YUEYANG SYLVITE SCI INST
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[0003] In the process of producing potassium nitrate in Chinese invention patent 200910115890X and Chinese invention patent 200910044146.5, there are two deficiencies: one is that the obtained semi-finished potassium nitrate product needs to use clear water to wash the potassium nitrate crystals to dissolve and wash away the entrained ammonium chloride crystals. A part of potassium nitrate crystal has been removed, resulting in a low output of potassium nitrate produced in a single cycle; the 2nd, the gained ammonium chloride product crystallizes out in potassium nitrate and ammonium chloride co-saturated solution, and the ammonium chloride product is easy to entrain potassium nitrate crystal, not only Poor quality of ammonium chloride product also causes low recovery rate of potassium in potassium nitrate product
In the process of producing potassium nitrate in Chinese invention patent 200510094223.X, due to the use of vacuum crystallization equipment, steam needs to be used to vacuumize the vacuum crystallizer, which has the disadvantage of consuming a large amount of cooling water and steam, resulting in high energy consumption.
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[0025] Such as figure 1 , figure 2 Shown, the present invention's metathesis air-cooled crystallization method produces potassium nitrate technique, and it is to take Repone K and ammonium nitrate as raw material, produces potassium nitrate and ammonium chloride by metathesis reaction and air-cooled crystallization, the present invention implements by following way :
[0026] (1) Mix potassium chloride, ammonium nitrate and water in a certain proportion and add them to the ingredients dissolving tank, feed steam to heat directly, stir to dissolve potassium chloride and ammonium nitrate, and prepare nitric acid at a temperature of 70-100°C The molar ratio of ammonium to potassium chloride is (1.35-1.8): 1, and the mixed solution of Baume concentration is 35-44°Bé.
[0027] (2), after the prepared solution is sent to the filter to filter and remove impurities, the filtrate is sent to the crude potassium cooling crystallization system and the air cooling crystallization proces...
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The invention discloses a process for producing potassium nitrate by double decomposition air-cooling crystallization method, which uses ammonium nitrate and potassium chloride as raw materials, adopts double decomposition reaction to produce potassium nitrate and ammonium chloride, and during the process of producing potassium nitrate and ammonium chloride, The air cooling crystallization process is adopted, the air is used as the cooling medium and the solution is directly mixed and contacted, convective heat transfer and diffusion heat transfer occur, and the cooling crystallization of potassium nitrate and ammonium chloride is realized. The product quality is good, the ammonium chloride product is of good quality, and large-scale continuous production has been realized.
Description
1. Technical field [0001] The invention relates to a production process for producing potassium nitrate and ammonium chloride by metathesis reaction of ammonium nitrate and potassium chloride, in particular to a production process using an air cooling crystallization process in the process for producing potassium nitrate and ammonium chloride by metathesis . 2. Background technology [0002] Potassium nitrate is an important inorganic chemical product. According to its use, potassium nitrate is mainly divided into industrial potassium nitrate and agricultural potassium nitrate. Potassium nitrate is mainly produced by the conversion method of nitrate and potassium chloride. The typical production process is as follows: Sodium nitrate and potassium chloride double decomposition method, nitric acid and potassium chloride conversion method, ammonium nitrate and potassium chloride ion exchange method, and ammonium nitrate and potassium chloride double decomposition method, due to...
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IPC IPC(8): C01D9/10
Inventor 张罡
Owner YUEYANG SYLVITE SCI INST