Industrial producing method and device for diluting concentrated nitric acid

Abstract

This invention relates to a commercial method and equipment for diluting concentrated nitric acid. First, the desalinized water is injected into dilution tank, the concentrated nitric acid pump is started, the acid flows passing through stepwise unit of the tank and enters the tank uniformly. At the same time an external circulation pump and an external cooling apparatus start to work for removing heat released during the mixing. When the temperature of the tank reaches 40deg.C, the controller connected with the thermometer cuts off the acid injection pump, the external circulation pump works continuously. Till the temperature lowers to 30deg.C, the concentrated nitric acid is injected into said tank. When acid in the tank is of the preset volume, the injection pump is cut-off, but external system ifs continued. The nitrogen dioxide produced during dilution is pumped into water absorption tank, then discharged off. This invention has advantages of: stable production, safety, convenient operation and various indexes meet the desigh requirements.

Description

Technical field: [0001] The invention relates to a concentrated nitric acid dilution industrial production method and a device thereof. Background technique [0002] With the development of my country's petrochemical industry, the demand for nitric acid as a basic chemical raw material is increasing year by year. In recent years, the domestic production of nitric acid has reached about 4 million tons per year, and concentrated nitric acid (98%) is generally sold as a product through railways and roads. For users, it is found that different users require different concentrations of nitric acid, so there is a dilution problem of how to turn concentrated nitric acid into dilute nitric acid of different concentrations, and make it industrialized. But at present our country does not have a set of better and more mature process methods about the dilution of concentrated nitric acid. The main reason is that it cannot solve the problems of the large instantaneous heat release of conc...

AI Technical Summary

Problems solved by technology

[0008] Concentrated nitric acid dilution is to uniformly mix a certain amount of concentrated nitric acid with a certain amount of desalted water in order to obtain the required concentration of dilute nitric acid, but as we all know, although concentrated nitric acid can be mixed with water in any proportion, it will exotherm violently after mixing. In addition, when exposed to high temperature and light, it decomposes and releases nitrogen oxides. If this part of heat cannot be taken out in time, the material will suddenly boil, which constitutes a hidden danger in production safety.

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