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Method for producing N2O4 (nitrogen tetroxide) through combining normal pressure diluted nitric acid, pressurized diluted nitric acid and concentrated nitric acid devices

A joint production and dilute nitric acid technology, which is applied in the direction of nitrogen dioxide, energy input, nitrogen oxides/oxyacids, etc., can solve the problem that idle and available equipment cannot be reused, the anti-risk ability is weakened, and the safety and environmental protection production of chemical enterprises cannot be satisfied. To achieve the effect of improving the ability to resist risks and market competitiveness, changing product structure and composition, and meeting market supply demand

Inactive Publication Date: 2012-11-14
魏作胜 +2
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AI Technical Summary

Problems solved by technology

If a new set of N 2 o 4 It is impossible for the production device to make full use of the public works conditions of the existing device, which also results in the use of idle and available equipment, high investment, and a long construction period; and dinitrogen tetroxide is only used as a by-product in the production process of industrial concentrated nitric acid, and the output is relatively low. Small, unable to effectively meet market demand, the rate of return of corporate capital recovery is small, and the ability to resist risks is weakened
In addition, the tail gas treatment device of the original atmospheric nitric acid section is relatively backward, which cannot meet the requirements of safe and environmentally friendly production of chemical enterprises

Method used

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  • Method for producing N2O4 (nitrogen tetroxide) through combining normal pressure diluted nitric acid, pressurized diluted nitric acid and concentrated nitric acid devices

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Embodiment 1

[0024] This embodiment is the specific application of the present invention in Chongqing Sanling Chemical Fertilizer Co., Ltd., and its steps are as follows:

[0025] The first step: joint production of NO with atmospheric pressure dilute nitric acid, pressurized dilute nitric acid and concentrated nitric acid equipment 2 gas;

[0026] Specific steps:

[0027] The ammonia oxidation gas from the waste heat boiler of the atmospheric dilute nitric acid unit is cooled by the quick cooler and the gas cooler, and then enters the primary oxidation tower, and the NO in the gas is initially oxidized into NO by the secondary air from the blower. 2 , the oxidation rate is as high as 92%. At the same time, the "55%" nitric acid produced by the tower is pumped to the dilute acid storage tank in the pressurized nitric acid section for intermediate nitric acid production of concentrated nitric acid; the gas exiting the primary oxidation tower is re-oxidized Almost all of the tower is oxid...

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Abstract

The invention relates to a method for producing N2O4 (nitrogen tetroxide) through combining normal pressure diluted nitric acid, pressurized diluted nitric acid and concentrated nitric acid devices. The method comprises the following steps that the normal pressure diluted nitric acid, pressurized diluted nitric acid and concentrated nitric acid devices are combined for preparing NO2 (nitrogen dioxide) gas; liquid-stage N2O4 is prepared; and the discharged tail gas is treated. The public engineering conditions of the existing device and idle equipment can be sufficiently utilized, the investment is reduced, and the building construction period is shortened. The combination of the normal pressure diluted nitric acid, pressurized diluted nitric acid and concentrated nitric acid devices is realized, and the industrial level N2O4 is produced for reaching the goals of revitalizing the existing assets, increasing the product varieties and improving the risk-resistance capability of enterprises.

Description

technical field [0001] The invention belongs to N 2 o 4 The field of production technology, especially related to the joint production of N 2 o 4 Methods. Background technique [0002] At present, the production of dinitrogen tetroxide in China is mainly concentrated in Jihua and Huaihua, and it is only a by-product in the process of producing concentrated nitric acid by the direct nitrification method. The output is extremely small. If the recovery of dinitrogen tetroxide is increased, it will seriously Affect the output and quality of finished concentrated nitric acid. In recent years, as aerospace industry and organic fine chemical industry have greatly expanded their applications in daily life, the amount of dinitrogen tetroxide has increased significantly. Therefore, it is urgent to increase the production capacity of dinitrogen tetroxide. In addition, in the industrial nitric acid manufacturing industry, the dual-pressurized nitric acid "four-in-one" unit is grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/36
CPCY02P20/129
Inventor 魏作胜仲晓林喻德文张雪萍
Owner 魏作胜
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