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A system and process of ammonium chloride forced circulation continuous three-effect concentration and vacuum crystallization in the production of potassium nitrate by double decomposition method

An ammonium chloride crystallizer and three-effect concentration technology, which is applied in the direction of ammonium chloride, alkali metal nitrate preparation, ammonium halide, etc., can solve the problems such as the viscosity and low efficiency of the second-effect materials that are difficult to overcome, and reduce scaling. , Improve efficiency and reduce energy consumption

Active Publication Date: 2016-03-09
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A system and process of ammonium chloride forced circulation continuous three-effect concentration and vacuum crystallization in the production of potassium nitrate by double decomposition method
  • A system and process of ammonium chloride forced circulation continuous three-effect concentration and vacuum crystallization in the production of potassium nitrate by double decomposition method
  • A system and process of ammonium chloride forced circulation continuous three-effect concentration and vacuum crystallization in the production of potassium nitrate by double decomposition method

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Effect test

Embodiment 1

[0046] A kind of ammonium chloride forced circulation continuous three-effect concentration and vacuum crystallization system in the production of potassium nitrate by double decomposition method. Device 16, thickener 18 and centrifuge 19;

[0047] 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 top of heater 7 is connected with the feed inlet of one-effect separation chamber 6, and an effect circulation pump 12 is connected between the bottom end of described one-effect heater 7 and the bottom end of one-effect separation chamber 6, and described one-effect The bottom of effect separation chamber 6 is also connected with ammonium chloride crystallizer 16 by an effect discharge pump 13;

[0048] The top of described one-effect separation chamber 6 i...

Embodiment 2

[0053] 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

[0055] A kind of method that utilizes the system described in embodiment 1 to ammonium chloride forced circulation continuous three-effect concentration, vacuum crystallization in the production of potassium nitrate by double decomposition method, the steps are as follows:

[0056] Potassium nitrate mother liquor and 85wt% ammonium nitrate solution are added to the mixing tank 17 and mixed uniformly, keeping the temperature at 20-45°C, so that the ammonium chloride in the mixed material reaches saturation after mixing; the mixed material is transported to Preheat in the concentration preheater 15, 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 60%; the concentrated material enters the ammonium chloride crystallizer 16 Ammonium chloride is crystallized at 50°C, and then the material enters the thickener 18 and the centrifuge 19 in turn, and the solid ammonium...

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Abstract

The invention relates to ammonium chloride forced circulating continuous triple-effect concentration and vacuum crystallization system and an ammonium chloride forced circulating continuous triple-effect concentration and vacuum crystallization process in production of potassium nitrate by a double decomposition method. The system comprises a material mixing tank, a concentration preheater, a countercurrent triple-effect concentration device, an ammonium chloride crystallizer, a thickener and a centrifugal machine which are sequentially connected. The process comprises the following steps: uniformly mixing a potassium nitrate mother liquid with ammonium nitrate, wherein ammonium chloride in the mixed material reach a saturated state at 20-45 DEG C; pre-heating the mixed material; carrying out triple-effect concentration on the preheated material, wherein the water content of the concentrated material is controlled at 70-80%; crystallizing the concentrated material; feeding the crystallized material into the thickener, wherein the water content of the material from the thickener is controlled at 30-45%; carrying out centrifugal separation on the material from the thickener to obtain solid ammonium chloride. A chlorinated slurry is concentrated by using a countercurrent triple-effect concentration process, so that not only is the concentration temperature reduced and the corrosion to equipment by slurry alleviated, but also the use level of steam is further greatly saved and the energy consumption is reduced.

Description

technical field [0001] The invention relates to an ammonium chloride forced circulation continuous three-effect concentration and vacuum crystallization system and process in the production of potassium nitrate by double decomposition method, which belongs 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/10C01C1/16C01D9/16
CPCC01C1/164C01D9/10C01D9/16Y02P20/10
Inventor 王伟刘洪升李树坤朱孔杰
Owner KINGENTA ECOLOGICAL ENG GRP