Process device for preparing nitric acid aqueous solution

Abstract

The invention provides a process device for preparing a nitric acid aqueous solution. The device comprises an air bleaching tower, a commercial acid tank, a 98 acid high-level tank, a 60 acid tank, a diluted acid tank, an air sucking system and an air compressor, wherein the air bleaching tower is communicated with the commercial acid tank through a pipeline; the air bleaching tower is communicated with the 98 acid high-level tank, the 60 acid tank and the diluted acid tank through a pipeline respectively; the mixer is arranged among the 98 acid high-level tank, the 60 acid tank, the diluted acid tank and the air bleaching tower; the upper end of the air bleaching tower is connected with the air sucking system; the air compressor is communicated with the air bleaching tower through a pipeline; a connection pipeline between the air compressor and the air bleaching tower is provided with an air cooler; the air cooler is further communicated with the input port of the commercial acid tank; the input port of the commercial acid tank is connected with the air sucking system; the output port of the commercial acid tank is connected with the air bleaching tower through the mixer; and a connection pipeline between a commercial acid output port and the mixer is provided with an acid pump. Due to the adoption of the device, the requirements of customers in different industries on acid preparation can be met, and the problem of standard exceeding of carbon dioxide can be solved effectively; and the process device is environment-friendly and is convenient.

Description

technical field [0001] The invention relates to a process device for configuring acid aqueous solutions, in particular to a process device capable of conveniently configuring nitric acid aqueous solutions with various contents. Background technique [0002] The molecular formula of nitric acid is HNO3, which is a strong oxidizing and corrosive inorganic acid, and its anhydride is dinitrogen pentoxide. Nitric acid is easily soluble in water and completely ionized in water. At room temperature, the dilute solution of nitric acid is colorless and transparent, and the concentrated solution is brown. Nitric acid is unstable and easily decomposed by light. It should be stored in a brown bottle in a dark place away from light, and contact with reducing agents is strictly prohibited. Nitric acid is mainly produced by ammonia oxidation in industry, and is used to manufacture fertilizers, explosives, nitrates, etc. In organic chemistry, the mixture of concentrated nitric acid and co...

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Problems solved by technology

However, the concentration of nitric acid produced by the double-pressurized dilute nitric acid production unit is 60%, while the concentration of nitric acid produced by the nitric acid unit is 98%. The concentration of nitric acid produced by the device may not meet the needs of customers. Customers still need to prepare different concentrations of nitric acid aqueous solutions. During the preparation of nitric acid aqueous solutions, the mixture of concentrated nitric acid and dilute nitric acid will generate heat, causing a small amount of nitric acid to decompose. The reaction formula is answer for 4HNO 3 ==2H 2 O +4NO 2 +O 2 , resulting in a large amount of red-colored NO2 gas entering the environment, causing pollution

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