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Method for preparing concentrated ammonium nitrate solution through flash evaporation

A technology of ammonium nitrate and concentrated solution, which is applied in the direction of ammonium nitrate, chemical instruments and methods, ammonia compounds, etc., can solve problems such as energy waste and loss, and achieve the effects of reducing production costs, improving safety, and reducing investment

Active Publication Date: 2017-02-01
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing production process generally adopts pressurized neutralization technology with higher concentration of nitric acid (56%-62%) and ammonia. The heat of reaction is taken away with the ammonium nitrate solution and process steam, and is gradually lost during the production process. And it is necessary to add external heat (such as steam) to concentrate the ammonium nitrate, resulting in a waste of energy

Method used

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  • Method for preparing concentrated ammonium nitrate solution through flash evaporation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A nitric acid feed pipe 9 and a gas ammonia feed pipe 10 are installed at the front end of the tubular reactor 1, and material control valves FC1 and FC2 are arranged on the feed pipes. A temperature measuring device T1 is installed on the tubular reactor 1, and T1 is interlocked with FC1 and FC2 respectively. The back end of the tubular reactor 1 is connected with a Venturi throttling device 2 , and after the Venturi throttling device 2 is connected with a flash tank 3 .

[0030] The bottom of the flash tank 3 is connected to the ammonium nitrate concentrated solution product delivery pipe 11, and the upper part is equipped with a flash steam output pipe 12, on which a pressure measuring device P1 and a control valve FC3 are installed; the supplementary reaction gas ammonia pipe is passed into the flash liquid phase 22, on which the control valve FC5 is housed; the flash tank 3 is also connected to the return pipe 21, on which the flow measuring device F1 and the contr...

Embodiment 2

[0042] The processing parameters of the present embodiment are as follows:

[0043] The reactant nitric acid concentration is 58% (wt); the molar ratio of gaseous ammonia and nitric acid: 1.018:1; tubular reactor 1 temperature T1: 192 ° C; reaction pressure is 0.4MPa; flash tank 3 lower liquid phase temperature T2: 140°C; the pH value (PH1) of the concentrated ammonium nitrate solution in the lower part of the flash tank 3 is 4.8; the gas phase pressure P1 in the upper part of the flash tank 3 is 0.07MPa; the liquid phase pH value (PH2) in the lower part of the washing tower 4: 3.6; The ammonia content in the condensate is less than 5ppm. The amount of the liquid that comes out from the bottom of the washing tower 4 back into the flash tank is 8% (wt) of the circulating washing liquid; the amount of adding nitric acid in the circulating washing liquid is 2.7% (wt) of the circulating washing liquid; 5.3% (wt) of the total condensed liquid amount 17 to washing tower 4 reflux fl...

Embodiment 3

[0045] The processing parameters of the present embodiment are as follows:

[0046] The nitric acid concentration of the reactant is 60% (wt); the molar ratio of gaseous ammonia to nitric acid: 1.015:1; the temperature T1 of the tubular reactor 1: 193°C; the reaction pressure is 0.42MPa; the liquid phase temperature T2 at the bottom of the flash tank 3: 146°C; the pH value (PH1) of the concentrated ammonium nitrate solution in the lower part of the flash tank 3 is 4.7; the gas phase pressure P1 in the upper part of the flash tank 3 is 0.05 MPa; the liquid phase pH value (PH2) in the lower part of the washing tower 4: 3.8; The ammonia content in the condensate is less than 5ppm. The amount of the liquid that comes out from the bottom of the washing tower 4 back into the flash tank is 9% (wt) of the circulating washing liquid; the amount of nitric acid added in the circulating washing liquid is 3.3% (wt) of the circulating washing liquid; the process condensate reflux The retur...

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Abstract

The invention discloses a method for preparing a concentrated ammonium nitrate solution through flash evaporation. The method comprises that after nitric acid and ammonia gas undergo a pressurization reaction to produce a dilute ammonium nitrate solution (with a concentration of about 75-80wt%), the dilute ammonium nitrate solution is concentrated to a high concentration of 90-96wt% under action of reaction heat through one step in a pressure reduction flash evaporation device so that a desired concentrated ammonium nitrate solution product is obtained. The method reasonably utilizes energy and is free of ammonium nitrate solution multistage condensation of the traditional ammonium nitrate production technology so that energy is saved, a production process is simple, an investment is reduced and a production cost is reduced.

Description

technical field [0001] The invention relates to a method for producing ammonium nitrate concentrated solution, in particular to a method for preparing ammonium nitrate concentrated solution by flash evaporation. Background technique [0002] Nitric acid and ammonia will undergo a very violent chemical reaction, and the reaction can be used to produce ammonium nitrate. The reaction equation is as follows: [0003] NH 3 ↑+HNO 3 =NH 4 NO 3 +Q [0004] It can be seen from the equation that a large amount of heat will be released in the reaction process, and the released heat has a great relationship with the concentration of the raw material nitric acid. The higher the concentration of nitric acid, the greater the released heat. The existing production process generally adopts pressurized neutralization technology with higher concentration of nitric acid (56%-62%) and ammonia. The heat of reaction is taken away with the ammonium nitrate solution and process steam, and is gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/18
CPCC01C1/185
Inventor 闫保贵
Owner SEDIN ENG
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