Equipment for preparing nitric acid aqueous solution

Abstract

The invention provides equipment for preparing a nitric acid aqueous solution, relating to universal dilution equipment in the chemical or physical field. The equipment has the following advantages that the equipment can be used for preparing a nitric acid aqueous solution at any concentration; and in the preparation process, NO2 gas can not be exhausted into the environment and is reused by reacting with water to generate nitric acid. The equipment comprises a blower, a gas-liquid separator, an acid preparation tank, a dilute acid storage tank, a dilute acid circulating pump and an ejector, wherein the acid preparation tank is provided with an air inlet and a gas outlet; the outlet of the blower is connected with the gas-liquid mixture inlet of the gas-liquid separator; the gas outlet of the gas-liquid separator is connected with the air inlet of the acid preparation tank; the gas outlet of the acid preparation tank is connected with the pumped medium inlet of the ejector; the outlet of the ejector is connected with the inlet of the dilute acid storage tank; the outlet of the dilute acid storage tank is connected with the inlet of the dilute acid circulating pump; and the outlet of the dilute acid circulating pump is connected with the working medium inlet of the ejector.

Description

technical field [0001] The invention relates to a common dilution device in the field of chemistry or physics, in particular to a device for preparing nitric acid aqueous solution. Background technique [0002] The molecular formula of nitric acid is HNO 3 , 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 concentrated sulfuric acid is an important nitrating ...

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Problems solved by technology

But 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 be able to meet the needs of customers. Customers still need to prepare different concentrations of nitric acid aqueous solutions. The formula is 2HNO 3 =H 2 O+2NO 2 , resulting in a large amount of red NO 2 Gas enters the environment, causing pollution

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