Method and device for continuous conversion without stirring to produce sodium nitrate

Abstract

The invention provides a method and device for producing sodium nitrate through continuous conversion without stirring, mainly comprising: ammonia oxidation to prepare nitrogen oxides, preparation of soda ash solution, and sodium nitrite mother liquor conversion system. Sodium nitrite mother liquor conversion system is mainly composed of conversion tower, pre-transformation tower, absorption tower, mother liquor storage tank and supporting pumps and pipelines. The conversion reaction of nitric acid and mother liquor is carried out in the conversion tower, and the conversion liquid is used to reflux and backwash the bottom of the conversion tower. The gas in the conversion tower is separated by the gas-liquid separator and then goes to the pre-reformer tower. The tower absorbs and prepares the raw material liquid. The advantages of the present invention are: sodium nitrate production is carried out continuously, air stirring is replaced by reflux and backwashing of the conversion liquid, and oxygen-distributed air is added in proportion to the conversion gas absorption process, which optimizes the process operation and reduces the load on the absorption tower and the rear processing procedures, The production capacity is improved, the energy consumption is reduced, and the emission of NOx is reduced, which is beneficial to 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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