Device and process for producing dilute nitric acid by magnesium nitrate method

Abstract

The invention belongs to the technical field of dilute nitric acid production, and particularly discloses a device and a process for producing dilute nitric acid by a magnesium nitrate method, and the process specifically comprises a series of follow-up treatments of putting raw materials into a nitric acid concentration tower for concentration treatment, removing nitrous acid by a bleaching tower, condensing and the like. On the basis of an original aqua fortis production device of a company, by combining actual conditions of the company, technological parameters and equipment are improved to meet the requirements of production of dilute nitric acid, production of dilute nitric acid can be guaranteed on the premise of considering production of concentrated nitric acid, the utilization rate of the equipment is increased, and the cost of the company is reduced.

Description

technical field [0001] The invention belongs to the technical field of dilute nitric acid production, and in particular relates to a device and a process for producing dilute nitric acid by a magnesium nitrate method. Background technique [0002] There are five production methods of dilute nitric acid, namely normal pressure method, full medium pressure method, comprehensive method, full high pressure method and double pressurized method. The double pressurized method uses medium pressure for the oxidation of ammonia and high pressure for the absorption of nitrogen oxides. , this method absorbs the advantages of the full medium pressure method and the full high pressure method, and can adopt a higher absorption pressure than the full high pressure method, which is more suitable for the process. Control the loss of ammonia and platinum catalyst within a reasonable range, high absorption rate, high pressure absorption system, reduced volume, high acid concentration, high prod...

AI Technical Summary

Problems solved by technology

Control the loss of ammonia and platinum catalyst within a reasonable range, high absorption rate, high pressure absorption system, reduced volume, high acid concentration, high production intensity, optimized economic and technical indicators, low production cost, and product nitric acid concentration at 58 Between ~62%, the NOX content in the tail gas is low, which meets the international emission requirements. The infrastructure investment is moderate, the concentration range of the product can basically meet the needs of chemical production, and the comprehensive utilization of energy recovery is reasonable. It is currently the most commonly used dilute nitric acid production method. Dilute nitric acid is used as an industrial raw material. With the improvement of production technology, the requirements for the concentration of dilute nitric acid become higher and higher, and the concentration also rises from 40% to about 68%. Because nitric acid has a significant Features, our company's double pressurization process is relatively mature, the product is 58~62% dilute nitric acid, it is difficult to make a big change and adjustment of the process route, and the concentration change cannot be adjusted greatly, and in the process flow of producing concentrated nitric acid, the process There is great operational flexibility in parameters; considering the overcapacity of the company's concentrated nitric acid and the low utilization rate of equipment, in order to improve the competitiveness of the company's products, the company's personnel have modified and adjusted the process parameters and equipment from the process of producing concentrated nitric acid , in order to meet the process requirements for the production of 65% and 68% dilute nitric acid

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