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Application of fixed bed catalytic reactor in removal of hydrazine nitrate and hydroxylamine nitrate

A catalytic reactor and fixed bed technology, applied in the direction of chemical instruments and methods, nitric acid, nitrogen oxides/oxyacids, etc., can solve problems such as insufficient reaction, violent reaction, leakage, etc., and achieve no safety hazards and simple operation , the effect of excellent economy

Active Publication Date: 2022-06-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of removing hydrazine nitrate and hydroxylammonium nitrate mainly includes adding oxidant such as sodium nitrite or feeding dinitrogen tetroxide gas, etc. to oxidize hydrazine nitrate and hydroxylamine nitrate into nitrogen, water, nitrogen oxides and other products. The disadvantages are: the consumption of oxidant is large, the cost is high, the reaction is extremely violent, and there is a certain safety risk; when sodium nitrite is used as the oxidant, it is easy to produce new solid waste sodium nitrate; the utilization rate of nitrogen dioxide is low and there is a risk of leakage
The ruthenium-based catalyst can decompose hydrazine nitrate and hydroxylamine nitrate into nitrogen, ammonia, hydrogen, and water. The reaction releases a large amount of gas, which flows disorderly in the reaction liquid, destroying the solid-liquid (catalyst and feed liquid) contact, and the reaction is very fast. insufficient

Method used

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  • Application of fixed bed catalytic reactor in removal of hydrazine nitrate and hydroxylamine nitrate
  • Application of fixed bed catalytic reactor in removal of hydrazine nitrate and hydroxylamine nitrate
  • Application of fixed bed catalytic reactor in removal of hydrazine nitrate and hydroxylamine nitrate

Examples

Experimental program
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Effect test

Embodiment 1

[0091] Weigh 700g of catalyst and place it in the catalyst filling cylinder (5), and above the material-liquid distribution plate (6), cover the stainless steel sieve plate (8) above the catalyst, compress the catalyst with a compression spring, and then cover the reactor end cap on, tighten. The feed liquid containing 0.3mol / L hydroxylamine nitrate, 0.1mol / L hydrazine nitrate, 1.0mol / L nitric acid and 0.06g / L hexavalent uranium was preheated to 60°C, and passed through the feed liquid port (1 ) is pumped into the reactor to carry out the reaction, and the reacted solution flows out from the product outlet (9), and the content of hydrazine nitrate in the solution after the reaction is measured to be 0.0002 mol / L and the content of hydroxylamine nitrate to be 0.000005 mol / L.

Embodiment 2

[0093] Weigh 700g of catalyst and place it in the catalyst filling cylinder (5), and above the material-liquid distribution plate (6), cover the stainless steel sieve plate (8) above the catalyst, compress the catalyst with a compression spring, and then cover the reactor end cap on, tighten. The feed liquid containing 0.3mol / L hydroxylamine nitrate, 0.1mol / L hydrazine nitrate, 1.0mol / L nitric acid and 0.06g / L hexavalent uranium was preheated to 80°C, and passed through the feed liquid port (1 ) is pumped into the reactor to carry out the reaction, and the reacted solution flows out from the product outlet (9), and the content of hydrazine nitrate after the reaction is measured to be 0.00001 mol / L and the content of hydroxylamine nitrate to be 0.000008 mol / L.

Embodiment 3

[0095] Weigh 700g of catalyst and place it in the catalyst filling cylinder (5), and above the material-liquid distribution plate (6), cover the stainless steel sieve plate (8) above the catalyst, compress the catalyst with a compression spring, and then cover the reactor end cap on, tighten. The feed liquid containing 0.3mol / L hydroxylamine nitrate, 0.1mol / L hydrazine nitrate, 1.0mol / L nitric acid and 0.06g / L hexavalent uranium was preheated to 60°C, and passed through the feed liquid port (1 ) is pumped into the reactor to carry out the reaction, and the reacted solution flows out from the product outlet (9), and the content of hydrazine nitrate in the solution after the reaction is measured to be 0.0004 mol / L and the content of hydroxylamine nitrate to be 0.000009 mol / L.

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Abstract

The invention discloses a fixed bed catalytic reactor and application of the fixed bed catalytic reactor to removal of a small amount of hydrazine nitrate and hydroxylamine nitrate in nitric acid. The fixed bed catalytic reactor comprises a shell, a feed liquid distribution plate and a feed liquid conveying core tube, and a cavity is defined by the shell; a feed liquid inlet and a product outlet are formed in the top of the shell; the feed liquid distribution plate is positioned at the lower part in the cavity; the feed liquid conveying core tube is positioned in the cavity; the upper end of the feed liquid conveying core tube is communicated with the feed liquid inlet; and the lower end of the feed liquid conveying core tube penetrates through the feed liquid distribution plate and is positioned above the bottom of the shell. By utilizing the reactor, the preheated feed liquid is decomposed into nitrogen, hydrogen and water by hydrazine nitrate and hydroxylamine nitrate under the action of the supported ruthenium catalyst, and the nuclear power waste liquid can be safely and efficiently treated.

Description

technical field [0001] The application relates to a fixed-bed catalytic reactor, its application in the removal of hydrazine nitrate and hydroxylamine nitrate, and belongs to the field of nuclear power waste treatment and environmental protection. Background technique [0002] Nuclear power is a green, low-carbon and clean energy with high technological maturity, and it is an important and preferred technical route for human beings to solve energy problems in the future. However, the safety of highly radioactive waste, namely "spent fuel", is one of the main factors restricting the large-scale promotion and application of nuclear power. The overall utilization rate of nuclear fuel in nuclear power reactors is not high. Spent fuel containing unconverted uranium is an important nuclear element resource. At present, the nuclear fuel closed cycle route is mostly adopted to separate and purify nuclear elements such as uranium, plutonium and neptunium in spent fuel for further uti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/02G21F9/06C01B21/46
CPCB01J8/02B01J8/008G21F9/06C01B21/46Y02E30/30
Inventor 赵许群张健梁兵连史海沈铮黄延强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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