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Preparation method and apparatus of nitrogen oxides

A technology for preparing equipment for nitrogen oxides, applied in the direction of nitrogen oxides/oxyacids, nitrogen dioxide, etc., can solve serious problems, corrosion of equipment and pipelines, difficult long-term stable operation, etc., to improve the oxidation effect, The effect of avoiding corrosion

Pending Publication Date: 2019-04-23
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the preparation method of nitrogen oxides in the oxidation price adjustment process of Pu(III) in the post-treatment process, in the patent "a system and method for price adjustment of plutonium-containing feed liquid", the nitrogen oxide preparation method mainly adopts Produced by pyrolysis of concentrated nitric acid, the advantage of this method is that concentrated nitric acid can be directly decomposed to produce nitrogen oxides without additional reagents; the disadvantage is that the high temperature decomposition of concentrated nitric acid will severely corrode the device and pipeline, and it is difficult to run stably for a long time

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  • Preparation method and apparatus of nitrogen oxides

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Effect test

Embodiment 1

[0031] like figure 1 The size parameters of the nitrogen oxide preparation device shown are as follows: the total height of the packing column is 1900mm, the diameter is 60mm, the packing is made of theta ring (stainless steel), Φ5*5mm, and the upper part of the packing column is kept in a circulating water jacket.

[0032] Nitrogen oxide preparation experiments were carried out based on the established nitrogen oxide preparation device, and the generated nitrogen oxides were absorbed and treated with hydrazine nitrate-hydroxylamine solution.

[0033] Reaction feed liquid: nitric acid concentration 10mo / L, sodium nitrite concentration 4mol / L.

[0034] Operating process conditions:

[0035] The flow rate of nitric acid liquid is 2.5L / h, the flow rate of sodium nitrite solution is 5L / h, the air flow rate at the bottom of the packed column is 650L / h, and the temperature of heat preservation circulating water is 80°C; the nitrogen oxides produced are made of hydrazine nitrate-hyd...

Embodiment 2

[0037] like figure 1 The size parameters of the nitrogen oxide preparation device shown are as follows: the total height of the packing column is 1900mm, the diameter is 60mm, the packing is made of theta ring (stainless steel), Φ5*5mm, and the upper part of the packing column is kept in a circulating water jacket.

[0038] Nitrogen oxide preparation experiments were carried out based on the established nitrogen oxide preparation device, and the generated nitrogen oxides were absorbed and treated with hydrazine nitrate-hydroxylamine solution.

[0039] Reaction feed liquid: nitric acid concentration 10mo / L, sodium nitrite concentration 4mol / L.

[0040] Operating process conditions:

[0041] The flow rate of nitric acid feed solution is 2L / h, the flow rate of sodium nitrite solution is 4L / h, the air flow rate at the bottom of the packed column is 500L / h, and the temperature of heat preservation circulating water is 75°C; the nitrogen oxides produced use hydrazine nitrate-hydrox...

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Abstract

The invention relates to a preparation method and apparatus of nitrogen oxides. The method includes using concentrated nitric acid and sodium nitrite as reaction liquids, and using air flow to performstripping the reaction liquids to obtain nitrogen oxides. The apparatus herein comprises a filler column, a reaction liquid storage tank, a nitrogen oxide pending tank and a receiving tank; all the reaction liquid storage tank, the nitrogen oxide pending tank and the receiving tank are connected with the filler column; the reaction liquid storage tank comprises a nitric solution storage tank anda sodium nitrite solution storage tank; the lower portion of the filler column is also provided with an intake line. The preparation method has the advantages that concentrated nitric acid and sodiumnitrite are matched to replace concentrated nitric acid, so that the corrosive effect of the concentrated nitric acid upon equipment and lines is avoided; air is utilized to perform contact strippingon the reaction flows, the blown-in air helps oxidize nitrogen monoxide in a system into nitrogen dioxide, so that oxidation effect of nitrogen oxides is improved; an insulation system helps hold theinterior temperature of the filler column to a high level, so that the nitrous acid can be carried out in nitrogen oxide form.

Description

technical field [0001] The invention relates to the field of nuclear fuel reprocessing, in particular to a nitrogen oxide preparation method and device. Background technique [0002] The invention relates to a seasoning method and device for plutonium crude product liquid (1BP) to plutonium purification circulation raw material liquid (2AF) and plutonium product liquid (2BP) to plutonium pre-precipitation feed liquid (OF) in the Purex process of nuclear fuel reprocessing. The reprocessing process currently being studied uses reducing agents such as U(IV)-hydrazine, hydroxylamine-hydrazine or N,N-dimethylhydroxylamine-methylhydrazine to reduce and strip Pu(III), and the 1BP obtained after the separation of uranium and plutonium The plutonium in the feed liquid is trivalent, and before the purification and concentration of plutonium in the next step of extraction-stripping, Pu(III) needs to be adjusted to Pu(IV); at the same time, the Pu(III) nitrate solution obtained from the...

Claims

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Application Information

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IPC IPC(8): C01B21/36
CPCC01B21/36
Inventor 李高亮唐洪彬何辉兰天常尚文刘金平周贤明李斌
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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