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Direct process for producing nitric acid

A technology of nitric acid and nitric acid method, applied in the directions of nitric acid, nitric oxide, nitrogen oxides/oxyacids, etc., can solve the problems of complex process and low quality, and achieve the effect of ensuring quality, easy separation and saving raw materials

Inactive Publication Date: 2016-09-14
TIANJIN CITY PO MOIST CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a process for producing nitric acid by direct nitric acid method, aiming to solve the problems of complex process and low quality in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Oxygen compression: pass oxygen into the oxygen compression tank, compress the oxygen into liquid, and control the pressure to 2 standard atmospheres;

[0022] (2) Ammonia gas compression: Ammonia gas is fed into the ammonia gas compression tank, ammonia gas is compressed into liquid, and the pressure is controlled to be 2 standard atmospheres;

[0023] (3) Nitric oxide preparation: pass the oxygen obtained in step (1) and the ammonia obtained in step (2) into the nitric oxide preparation tank according to the volume ratio of 4:5, and the time of oxygen feeding is earlier than that of ammonia 10min, the pressure is controlled to be 2 standard atmospheres, and the product obtains nitric oxide;

[0024] (4) Nitrogen dioxide preparation: pass the nitric oxide obtained in step (3) and the oxygen obtained in step (1) into the nitrogen dioxide preparation tank according to the volume ratio of 3:2, and the time ratio of the oxygen feed into the nitrogen dioxide Nitrogen f...

Embodiment 2

[0028] (1) Oxygen compression: pass oxygen into the oxygen compression tank, compress the oxygen into liquid, and control the pressure to 3 standard atmospheres;

[0029] (2) Ammonia gas compression: Ammonia gas is fed into the ammonia gas compression tank, ammonia gas is compressed into liquid, and the pressure is controlled to be 3 standard atmospheres;

[0030] (3) Nitric oxide preparation: pass the oxygen obtained in step (1) and the ammonia obtained in step (2) into the nitric oxide preparation tank according to the volume ratio of 4:5, and the time of oxygen feeding is earlier than that of ammonia 5min, the pressure is controlled to be 3 standard atmospheres, and the product obtains nitric oxide;

[0031] (4) Nitrogen dioxide preparation: pass the nitric oxide obtained in step (3) and the oxygen obtained in step (1) into the nitrogen dioxide preparation tank according to the volume ratio of 3:2, and the time ratio of the oxygen feed into the nitrogen dioxide Nitrogen fo...

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Abstract

The invention discloses a direct process for producing nitric acid. The direct process comprises the following steps: (1) compressing oxygen; (2) compressing ammonia gas; (3) preparing nitrogen monoxide; (4) preparing nitrogen dioxide; (5) preparing nitric acid through a spraying method; (6) refluxing nitrogen monoxide. The direct process has the advantages that no intermediate that is harmful to the environment is generated during the production process of nitric acid; no product that affects the nitric acid is generated; the final byproduct namely nitrogen monoxide can be repeatedly used; the whole preparation technology is simple, the product quality is high, and the direct process is easy to popularize and use.

Description

technical field [0001] The invention relates to the technical field of nitric acid preparation, in particular to a process for producing nitric acid by a direct nitric acid method. Background technique [0002] Nitric acid is an important chemical raw material, and its output is second only to sulfuric acid among various acids. Industrial nitric acid according to HNO 3 The content is divided into concentrated nitric acid (96%-98%) and dilute nitric acid (45%-70%). Dilute nitric acid is mostly used in the manufacture of ammonium nitrate, nitrophosphate fertilizer and various nitrates. Concentrated nitric acid is mainly used in the defense industry and is the main raw material for the production of trinitrotoluene (TNT), nitrocellulose, and nitroglycerin. The intermediate product in the production of nitric acid - liquid dinitrogen tetroxide is a high-energy fuel for rockets and missiles. Nitric acid is also widely used in the organic synthesis industry; benzene is nitrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/40C01B21/26
CPCC01B21/40C01B21/26
Inventor 孙世全
Owner TIANJIN CITY PO MOIST CHEM
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