A kind of bleaching process and its device in the preparation process of nitric acid

A process, a technology of nitric acid, applied in the field of bleaching process and its device, can solve the problems of taking a lot of time, consuming a lot of electric energy or thermal energy, etc.

Active Publication Date: 2018-07-27
宁夏润夏能源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration of nitric acid produced by the above device may not be able to meet the needs of customers. Customers still need to prepare nitric acid aqueous solutions of different concentrations by themselves. However, in the process of preparing nitric acid aqueous solution, the mixture of concentrated nitric acid and dilute nitric acid will generate heat, which will cause a small amount of nitric acid to decompose. Its reaction formula is 4HNO 3 ==2H 2 O +4NO 2 +O 2 , so that the dilute nitric acid solution turns red
Conventional nitric acid bleaching often uses air or steam, that is, "cold bleaching" or "hot bleaching", but both technologies have defects, often consume a lot of electricity or heat energy, and take a lot of time at the same time

Method used

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  • A kind of bleaching process and its device in the preparation process of nitric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 Shown, a kind of device of the bleaching process in the preparation process of nitric acid comprises acid distribution tank 1, and the top outlet of described distribution acid tank 1 is connected with negative pressure pump 3, and the inlet end of distribution acid tank 1 is connected with hydrogen peroxide storage tank 6. The outlet end is connected, the top inlet of the hydrogen peroxide storage tank 6 is connected to the compressed air pipe 7, and a gas distributor 2 is horizontally arranged inside the acid distribution tank 1 .

[0024] That is, the hydrogen peroxide in the hydrogen peroxide storage tank 6 is driven by the compressed air in the compressed air pipe 7, and evenly enters the acid liquid in the acid distribution tank 1 through the gas distributor 2 to react with the nitrogen dioxide therein. The oxygen produced at the same time drives excess nitrogen dioxide to escape from the nitric acid solution, which is extracted and charged by neg...

Embodiment 2

[0027] A kind of bleaching process in the preparation process of nitric acid, comprises the following steps:

[0028] (1) Pump the acid tank for preparing nitric acid to a slight negative pressure of -10Pa;

[0029] (2) With compressed air as the power, hydrogen peroxide is introduced into the nitric acid solution in the acid distribution tank, and the hydrogen peroxide enters the nitric acid solution evenly through the gas distributor and stirred evenly, so that the hydrogen peroxide and the NO in the acid distribution tank 2 The molar ratio is 1.5:2;

[0030] (3) Recover excess NO at the outlet of the acid distribution tank 2 .

Embodiment 3

[0032] A kind of bleaching process in the preparation process of nitric acid, comprises the following steps:

[0033] (1) Pump the acid tank for preparing nitric acid to a slight negative pressure of -5Pa;

[0034] (2) With compressed air as the power, hydrogen peroxide is introduced into the nitric acid solution in the acid distribution tank, and the hydrogen peroxide enters the nitric acid solution evenly through the gas distributor and stirred evenly, so that the hydrogen peroxide and the NO in the acid distribution tank 2 The molar ratio is 1.2:2;

[0035] (3) Recover excess NO at the outlet of the acid distribution tank 2 .

[0036] The present invention uses hydrogen peroxide to evenly enter the solution in the acid distribution tank through a gas distributor (20 cm away from the bottom of the acid distribution tank), and the gas distributor evenly distributes to drive the NO in nitric acid 2 Reaction, conversion into nitric acid, and at the same time, the nitrogen di...

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Abstract

The invention provides a bleaching process and its device in the nitric acid preparation process, comprising the following steps: (1) pumping the acid preparation tank for preparation of nitric acid into a slight negative pressure; (2) pumping the nitric acid solution into the acid preparation tank Add hydrogen peroxide and stir evenly, so that the molar ratio of hydrogen peroxide to NO2 in the acid distribution tank is greater than 1:2; (3) Recover excess NO2 at the outlet of the acid distribution tank. The invention uses compressed air to make hydrogen peroxide evenly add into the nitric acid solution in the acid mixing tank through a distributor to react with nitrogen dioxide to generate nitric acid and oxygen, thereby achieving the purpose of bleaching nitric acid; at the same time, excess nitrogen dioxide is released and is absorbed The negative pressure pump is used to quickly control the nitrogen dioxide content in the acid distribution tank, which solves the problem of excessive nitrogen dioxide content.

Description

technical field [0001] The invention relates to the technical field of nitric acid preparation, in particular to a bleaching process and a device in the nitric acid preparation process. Background technique [0002] Nitric acid is one of the most important chemical products. Nitric acid is mainly produced by ammonia oxidation in industry, and is used to make fertilizers, explosives, nitrates, etc. Pure nitric acid is a colorless transparent liquid, and industrial nitric acid solution is brown due to dissolved nitrogen dioxide. At present, nitric acid is used in all walks of life, but different industries have different requirements on the concentration of nitric acid. For example, the production of ammonium nitrate by neutralization requires nitric acid with a concentration of 37-43% as a raw material, while the production of ammonium nitrate by pressurization requires a concentration of 60%. Nitric acid is used as a raw material; the IT industry needs nitric acid with a co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/46
Inventor 孙虎
Owner 宁夏润夏能源化工有限公司
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