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

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...

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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

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