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Preparation method and device of nitrogen oxide

A technology of nitrogen oxides and oxygen, which is applied in the field of nitrogen oxides preparation, can solve problems such as unfavorable project stable operation, serious material corrosion, unsuitable application of post-processing plants, etc., achieve continuous and stable supply and use, easy reaction, and benefit The effect of continuity

Pending Publication Date: 2019-03-08
CHINA NUCLEAR POWER ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing domestic nitrogen oxide gas is mainly a by-product of nitric acid industrial production, and its preparation process cannot be directly applied to post-processing plants
At present, domestic post-processing plants mainly use concentrated nitric acid to heat and decompose nitrogen oxides at high temperatures, but the process conditions are relatively harsh, and the material is severely corroded, which is not conducive to the stable operation of the project, especially for processes that require continuous price adjustment.
Domestic research institutions use liquid dinitrogen tetroxide as the nitrogen oxide gas source for post-processing price adjustment equipment research, but dinitrogen tetroxide is not a commonly used chemical reagent. It is usually used as rocket propellant fuel and has strong oxidizing properties. Corrosive and highly toxic, the boiling point is only 21.5°C, the storage and transportation conditions are relatively harsh, and there are risks in the supply of goods, so it is not suitable for use in reprocessing plants

Method used

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  • Preparation method and device of nitrogen oxide
  • Preparation method and device of nitrogen oxide

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Experimental program
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Embodiment 1

[0030] Such as figure 1 As shown, the device used in the preparation method of nitrogen oxides in this embodiment includes:

[0031] Reaction column 1, reaction column 1 is equipped with filler 3, preheated nitric acid solution and preheated nitrite solution are passed into reaction column 1, mixed in filler 3, nitric acid and nitrite react to generate nitrogen oxide gas , nitrogen oxides are NO x , where 1<x<2. ;

[0032] The buffer tank 2 includes: a first inlet 21 of the buffer tank, a first outlet 22 of the buffer tank, the first inlet 21 of the buffer tank is connected to the outlet 12 of the reaction column, and the liquid flowing through the filler 3 flows into the buffer tank through the first inlet 21 of the buffer tank The tank 2 is buffered, and the liquid in the buffer tank 2 is discharged from the first outlet 22 of the buffer tank.

[0033] The present embodiment provides the preparation method of nitrogen oxides carried out using the above-mentioned device, ...

Embodiment 2

[0037] This embodiment provides a method for preparing nitrogen oxides using the device in Embodiment 1, comprising the following steps:

[0038] 1) Preheat 11.5mol / L nitric acid solution and 3mol / L sodium nitrite solution to 45°C;

[0039] 2) Pass nitric acid solution and sodium nitrite solution into reaction column 1 with a flow rate of 50L / h and 50L / h respectively, the molar ratio of nitric acid and sodium nitrite in reaction column 1 is 11.5:3, and in reaction column 1 The filler 3 is fully contacted to react, the reaction temperature is 45°C, and nitrogen oxide gas is generated, and nitrogen oxide is NO x , where, 1<x<2;

[0040] 3) The nitrogen oxides produced by the reaction pass through the demister 4 to remove entrained liquid droplets to obtain nitrogen oxide products with a pressure of 3 atmospheres, which can be directly used in subsequent oxidation reactions.

[0041] According to the analysis of nitrogen oxide products, the output of nitrogen dioxide in nitroge...

Embodiment 3

[0043] This embodiment provides a method for preparing nitrogen oxides using the device in Embodiment 1, comprising the following steps:

[0044] 1) Preheat 8mol / L nitric acid solution and 1mol / L potassium nitrite solution to 40°C;

[0045] 2) Pass nitric acid solution and potassium nitrite solution into reaction column 1 with a flow rate of 10L / h and 20L / h respectively, the molar ratio of nitric acid and potassium nitrite in reaction column 1 is 4:1, and in reaction column 1 The filler 3 is fully contacted to react, the reaction temperature is 40°C, and nitrogen oxide gas is generated, and nitrogen oxide is NO x , where, 1<x<2;

[0046] 3) The nitrogen oxides generated by the reaction pass through the demister 4 to remove entrained liquid droplets to obtain nitrogen oxide products with a pressure of 2 atmospheres, which can be directly used in subsequent oxidation reactions.

[0047] According to the analysis of nitrogen oxide products, the output of nitrogen dioxide in nit...

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Abstract

The invention discloses a preparation method and device of nitrogen oxide. The preparation method includes following steps: preheating and mixing a nitric acid solution and a nitrite solution for reaction to generate nitrogen oxide gas, wherein nitrogen oxide is NOx, and x is greater than 1 and smaller than 2. The preparation method is easy-to-get in raw material, simple in process, easy in reaction, conducive to continuity of production operation and capable of ensuring continuous and stable supply and use of nitrogen oxide serving as an oxidant in a nuclear fuel aftertreatment plant.

Description

technical field [0001] The invention belongs to the technical field of preparation of nitrogen oxides, and in particular relates to a preparation method and device of nitrogen oxides. Background technique [0002] In the Purex process, the plutonium purification cycle and the plutonium tail system usually use an oxidant to oxidize trivalent plutonium to tetravalent plutonium due to process requirements. At present, reprocessing plants usually use nitrogen oxides as oxidants to adjust the valence state of plutonium. [0003] The existing domestic nitrogen oxide gas is mainly a by-product of nitric acid industrial production, and its preparation process cannot be directly applied to post-processing plants. At present, domestic post-processing plants mainly use concentrated nitric acid to heat and decompose nitrogen oxides at high temperatures, but the process conditions are relatively harsh, and the corrosion of materials is serious, which is not conducive to the stable opera...

Claims

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Application Information

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IPC IPC(8): C01B21/20C01B21/36
CPCC01B21/20C01B21/36
Inventor 李磊李思凡侯学锋李鑫刘郢纪雷鸣卢金成
Owner CHINA NUCLEAR POWER ENG CO LTD
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