Potassium nitrate production process by double decomposition-air cooling crystallization method

Abstract

A potassium nitrate production process by a double decomposition-air cooling crystallization method is disclosed. Ammonium nitrate and potassium chloride are adopted as raw materials. A double decomposition reaction is adopted to produce the potassium nitrate and ammonium chloride. In a process of producing the potassium nitrate and the ammonium chloride, an air cooling crystallization process is adopted, air is adopted as a cooling medium and is directly mixed with and in contact with a solution and convective heat transfer and diffusion heat transfer occur, thus achieving cooling crystallization of the potassium nitrate and the ammonium chloride. The potassium nitrate production process has characteristics of high raw material utilization rate, significant energy conservation and consumption reduction, good potassium nitrate product quality and good ammonium chloride product quality, and achieves large-scale continuous production.

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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Problems solved by technology

[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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