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, which mainly includes: ammonia oxidation to prepare nitrogen oxides, soda ash solution preparation, and sodium nitrite mother liquor conversion system. The sodium nitrite mother liquor conversion system mainly consists of a conversion tower, a pre-conversion tower, an absorption tower, a mother liquor storage tank and supporting pumps and pipelines. Nitric acid and mother liquor undergo a conversion reaction in the conversion tower, and the bottom of the conversion tower is refluxed and backwashed with the conversion liquid. The conversion tower gas is separated by the gas-liquid separator and then sent to the pre-conversion tower. The conversion gas is quantitatively mixed with oxygenated air and then enters the absorption The tower absorbs and prepares raw material liquid. The advantages of the present invention are: sodium nitrate production is carried out continuously, the conversion liquid is refluxed and backwashed instead of air stirring, oxygenated air is added in proportion to the conversion gas absorption process, the process operation is optimized, and the load on the absorption tower and subsequent processing steps is reduced. It improves production capacity, reduces energy consumption, reduces NOx emissions, and is beneficial to environmental protection.

Description

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

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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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