Continuous triple-effect falling-film concentration and vacuum crystallization system and method in potassium nitrate production through double-decomposition method

A metathesis method and vacuum crystallization technology, applied in the field of chemical production, can solve problems such as viscosity and low efficiency of secondary effect materials that are difficult to overcome, and achieve the effects of saving steam consumption, improving efficiency, and saving production time

Active Publication Date: 2015-01-07
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the mother liquor after primary crystallization and separation is mixed with ammonium nitrate, and concentrated by co-current double-effect evaporation, but it is difficult to overcome the problem that the production capacity of the evaporation device is reduced due to the high viscosity of the second-effect material and the reduced heat transfer coefficient.
This method also adopts heat exchange and cooling crystallization, which is an intermittent operation mode and has low efficiency.

Method used

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  • Continuous triple-effect falling-film concentration and vacuum crystallization system and method in potassium nitrate production through double-decomposition method
  • Continuous triple-effect falling-film concentration and vacuum crystallization system and method in potassium nitrate production through double-decomposition method
  • Continuous triple-effect falling-film concentration and vacuum crystallization system and method in potassium nitrate production through double-decomposition method

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Experimental program
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Embodiment 1

[0042] A continuous three-effect falling film concentration and vacuum crystallization system for ammonium chloride in the production of potassium nitrate by the double decomposition method, the system includes a sequentially connected mixing tank 17, a concentration preheater 15, a countercurrent three-effect concentration device, and ammonium chloride crystallization Device 16, thickener 18 and centrifuge 19;

[0043] The countercurrent three-effect concentration device comprises a first-effect heater 7, a first-effect separation chamber 6, a second-effect heater 5, a second-effect separation chamber 4, a three-effect heater 3 and a three-effect separation chamber 2, and the first-effect The lower end of the heater 7 communicates with the first-effect separation chamber 6, and an effective circulation pump 12 is connected between the top and the bottom of the first-effect heater 7, and the bottom end of the first-effect heater 7 passes through an effect Discharging pump 13 i...

Embodiment 2

[0049] Ammonium chloride continuous three-effect falling film concentration and vacuum crystallization system in the production of potassium nitrate by double decomposition method as described in embodiment 1, the difference is that described ammonium chloride crystallizer 16 is an OSLO type continuous crystallizer.

Embodiment 3

[0051] A kind of method that utilizes the system described in embodiment 1 to ammonium chloride continuous three-effect falling film concentration, vacuum crystallization in the double decomposition potassium nitrate production, step is as follows:

[0052] Add the potassium nitrate mother liquor and ammonium nitrate into the mixing tank 17 and mix evenly, keep the temperature at 20-45°C, so that the ammonium chloride of the mixed material reaches saturation after mixing; transport the mixed material to the concentrated preheater 15 Preheat at 50-80°C, and then enter the countercurrent three-effect concentration device to concentrate the material, so that the water content of the concentrated material is controlled at 50-70%; the concentrated material enters the ammonium chloride crystallizer 16 Ammonium chloride is crystallized at 45°C, and then the material enters the thickener 18 and the centrifugal pump 19 in turn, and the water content of the material coming out of the thi...

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Abstract

The invention relates to a continuous triple-effect falling-film concentration and vacuum crystallization system and method in potassium nitrate production through a double-decomposition method. The continuous triple-effect falling-film concentration and vacuum crystallization system comprises a mixing tank, a concentration preheater, a backflow triple-effect concentration device, an ammonium chloride crystallizer, a thickener and a centrifuge, which are sequentially connected. The continuous triple-effect falling-film concentration and vacuum crystallization method comprises the following steps: adding potassium nitrate mother liquid and ammonium nitrate into the mixing tank for uniformly mixing, subsequently conveying to the mixture to the concentration preheater for preheating, feeding into the backflow triple-effect concentration device for concentration, feeding into the ammonium chloride crystallizer for crystallization after concentration, further sequentially feeding into the thickener and the centrifuge, separating a solid ammonium chloride product from the centrifuge, and returning the separated solution as a circulating mother liquid to a potassium nitrate production process through the double-decomposition method for circulation. Under the condition that the number of concentration equipment is not increased, the continuous triple-effect falling-film concentration and vacuum crystallization system and method in potassium nitrate production through double-decomposition method, provided by the invention, can achieve large-scale and continuous production, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a continuous three-effect falling film concentration and vacuum crystallization system and method of ammonium chloride in the production of potassium nitrate by double decomposition method, belonging to the technical field of chemical production. Background technique [0002] Domestic double decomposition method to produce potassium nitrate mainly adopts sodium nitrate-potassium chloride method and ammonium nitrate-potassium chloride method. The raw material price of the former is higher, and the economic value of the by-product sodium chloride is lower. The ammonium nitrate-potassium chloride double decomposition process is widely used, and the four-step circulation method is the main method: add water and potassium chloride to the circulating mother liquor, and when the temperature drops, potassium nitrate crystallizes out. Add ammonium nitrate to the mother liquor, and then evaporate and concentrate, then cool and crystalli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16C01D9/10B01D1/26
Inventor 邹士龙杨明渠伟王伟
Owner KINGENTA ECOLOGICAL ENG GRP
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