Stirring-free method and device for producing sodium nitrate through continuous conversion

Abstract

The invention provides a stirring-free method and a stirring-free device for producing sodium nitrate through continuous conversion. The device mainly comprises an ammoxidation-prepared oxynitride system, a soda ash solution preparing system and a sodium nitrite mother solution conversion system, wherein the sodium nitrite mother solution conversion system mainly comprises a converter tower, a pre-converter tower, an absorption tower, a motor solution storage tank and matched pumps and pipelines. Nitric acid and the mother solution undergo conversion reaction in the converter tower; conversion solution reflows and back washes the bottom of the converter tower; gas of the converter tower is separated by a gas-liquid separator and enters the pre-converter tower; and converted gas and oxygen-mixed air are mixed quantitatively and then the mixture enters the absorption tower for absorption to prepare feed solution. The method and the device have the advantages that: the production of the sodium nitrate can be continuously performed; the reflowing and backwashing of the conversion solution replaces air stirring; in the converted gas absorbing process, the converted gas is added with the oxygen-mixed air in a ratio, the process operation is optimized, and loads of the adsorption tower and subsequent processing procedure are lightened; the production capacity is improved; energy consumption is reduced; NOx emission is decreased; and the method and the device are favorable for environmental protection.

Description

technical field [0001] The invention belongs to the technical field of production of inorganic chemical products, and in particular relates to a method and a device for continuously converting and producing sodium nitrate without stirring. Background technique [0002] Sodium nitrate is an important inorganic chemical raw material, which is widely used in various aspects such as chemical industry, medicine, food, agriculture and military industry. In the current industrial production, sodium nitrite mother liquor conversion (also called nitration) method is generally used to produce sodium nitrate. The main process is: ammonia oxidation to produce NO, which is partially oxidized to NO according to the process requirements 2 , into the alkali absorption tower, the raw material liquid is prepared to obtain a mixed solution of sodium nitrate and sodium nitrite, and the separated sodium nitrite is obtained through evaporation, crystallization and separation. sodium nitrate. T...

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Problems solved by technology

Disadvantages of intermittent air stirring conversion process are: intermittent operation, insufficient mother liquor oxidation reaction, low production capacity

However, this patent application still needs to blow air into the reforming tower for stirring, which does not solve the serious problem caused by the gas stirring in the above-mentioned transforming process, and the reformed gas is not separated from gas and liquid, and the gas at the top of the reforming tower entrains liquid to the pre-reforming tower, increasing the The load of the pre-reforming tower, the diluted NO x Gas increases the aftertreatment load and the difficulty of gas treatment

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