A system and method for producing potassium nitrate by continuous metathesis

A technology of potassium nitrate and interconnection, which is applied in the system field of continuous double decomposition method to produce potassium nitrate, which can solve the problems of difficult to overcome the viscosity of secondary effect materials, high control of primary crystallization temperature, and low product yield, so as to save steam consumption , Saving production time, the effect of low concentration temperature

Active Publication Date: 2016-05-04
KINGENTA ECOLOGICAL ENG GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly has the following defects: 1. the primary crystallization temperature is controlled high, and the product yield is low
②Mix the mother liquor after primary crystallization and separation with ammonium nitrate, and then use co-current double-effect evaporation to concentrate, but it is difficult to overcome the problem of the high viscosity of the second-effect material and the decrease in heat transfer coefficient caused by the decline in the production capacity of the evaporation device
③ After the ammonium chloride is concentrated, the conventional cooling method is used to cool down and crystallize, which is an intermittent operation method and the efficiency is low

Method used

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  • A system and method for producing potassium nitrate by continuous metathesis
  • A system and method for producing potassium nitrate by continuous metathesis
  • A system and method for producing potassium nitrate by continuous metathesis

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Embodiment 1

[0044] A system for producing potassium nitrate by continuous metathesis method, including dissolving tank, potassium nitrate vacuum crystallization device, primary thickener, primary centrifuge, mixing tank, concentration preheater, countercurrent three-effect concentration device, and vacuum continuous crystallizer 16. Secondary thickener and secondary centrifuge; the discharge port of the dissolving tank is connected with the feed port of the potassium nitrate vacuum crystallization device, and the discharge port of the potassium nitrate vacuum crystallization device is connected with the feed port of the primary thickener. The feed port is connected, the discharge port of the primary thickener is connected with the feed port of the primary centrifuge, the liquid discharge port of the primary centrifuge is connected with the feed port of the mixing tank, and the discharge port of the mixing tank It is connected with the feed port of the concentrated preheater, and the discha...

Embodiment 2

[0051] A kind of method that utilizes the system continuous metathesis method described in embodiment 1 to produce potassium nitrate, the steps are as follows:

[0052] Add circulating mother liquor, water and potassium chloride into the dissolving tank, heat it to 75°C with steam and stir to dissolve it completely to prepare a mixed solution, the said circulating mother liquor is ammonium chloride mother liquor, ammonium ions and chloride ions in the mixed solution The molar ratio of the solution is 1:1, and the mixed solution enters the potassium nitrate six-stage series vacuum crystallization device in turn, the temperature of the first-stage vacuum crystallizer is controlled at 70°C, the vacuum degree is 0.020MPa, and the temperature of the second-stage vacuum crystallizer is 55°C. The vacuum degree is 0.008MPa, the temperature of the third-stage vacuum crystallizer is 42°C, the vacuum degree is 0.006MPa, the temperature of the fourth-stage vacuum crystallizer is 35°C, the ...

Embodiment 3

[0055] A kind of method that utilizes the system continuous metathesis method described in embodiment 1 to produce potassium nitrate, the steps are as follows:

[0056] Add circulating mother liquor, water and potassium chloride into the dissolving tank, heat to 80°C with steam and stir to dissolve it completely to prepare a mixed solution, the said circulating mother liquor is ammonium chloride mother liquor, ammonium ions and chloride ions in the mixed solution The molar ratio of the solution is 1:1.1, and the mixed solution enters the potassium nitrate six-stage series vacuum crystallization device in sequence. The temperature of the first-stage vacuum crystallizer is controlled at 75°C, the vacuum degree is 0.028MPa, and the temperature of the second-stage vacuum crystallizer is 60°C. The vacuum degree is 0.009MPa, the temperature of the third-stage vacuum crystallizer is 45°C, the vacuum degree is 0.007MPa, the temperature of the fourth-stage vacuum crystallizer is 38°C, t...

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Abstract

The invention relates to a continuous system and method for producing potassium nitrate through a double decomposition method. The system comprises a dissolving tank, a potassium nitrate vacuum crystallization device, a primary thickener, a primary centrifuge, a material mixing tank, a concentrating preheating device, a backflow three-effect concentrating device, a continuous vacuum crystallizer, a secondary thickener and a secondary centrifuge. The invention further relates to the continuous method for producing the potassium nitrate through the double decomposition method. Through the system and the method, a new design thought of vacuum crystallization of potassium nitrate is adopted, the crystallization process can be controlled more precisely, the crystallization quality and the yield of the potassium nitrate are more stable, continuous feeding and continuous discharging can be achieved, and continuous production is achieved.

Description

technical field [0001] The invention relates to a system and a method for producing potassium nitrate by a continuous metathesis 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 crystallize to precipitate ammonium chloride crystals. The separated mother liquor is returned as circulating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/10C01C1/16
CPCC01D9/10
Inventor 李新柱王金玉赵强于南树
Owner KINGENTA ECOLOGICAL ENG GRP
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