Cradle to Gate
Identity ID
3d85d195-1f6a-4692-ada3-2b4197676d95
Materials
Associated ID
63fb1030-d0e7-48e8-8547-72af8007e864
Included activities starts
Included activities ends
Description
Sodium nitrite is an important chemical raw material, widely used in industries such as food processing, chemical synthesis, bleaching and dyeing, metal treatment and pharmaceuticals; Sodium nitrite is modelled as a pure substance; when modelling this substance, the user is required to add a solvent of their choice in the model. The dataset includes the main raw and auxiliary materials, energy, wastes and atmospheric emissions of the production process, while infrastructure such as the manufacture of production equipment and plant construction is not included within the dataset boundary; the data inventory is formed by merging data from multiple sources; the production activities of this product include ammonia oxidation, alkali-liquor absorption, evaporation and concentration, cooling crystallization, centrifugal drying. Sodium nitrate is regarded as a by-product of this process.
Activity Description
The production activities of this product include ammonia oxidation, alkali absorption, evaporation concentration, cooling crystallization, and centrifugal drying to obtain sodium nitrite and sodium nitrate products.
Process Description
Sodium nitrite, with the chemical formula NaNO2 and CAS number 7632-00-0, is a white or slightly yellowish orthorhombic crystalline powder. It has a mildly salty taste, is hygroscopic, readily soluble in water and liquid ammonia, and slightly soluble in methanol, ethanol, and diethyl ether. Its aqueous solution is alkaline. It slowly oxidizes to sodium nitrate in air. Sodium nitrite is an important inorganic chemical raw material widely used in food processing, chemical synthesis, bleaching and dyeing, metal treatment, pharmaceuticals, and other industries.
Time period
2018
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The nitrogen oxide alkali absorption method is the only mainstream technology for the production of sodium nitrite. It is produced through the absorption reaction of nitrogen oxides in the exhaust gas and soda ash solution. The process has the advantages of environmental protection and resource utilization, and accounts for more than 99% of the domestic powdered sodium nitrite market. This data set represents the mainstream technology: Soda ash is prepared into qualified fresh alkali liquid in the alkali dissolving tank, filtered and pumped into the fresh alkali liquid storage tank, and then sent to the alkali absorption tower; ammonia gas enters the preheater after filtering, and then enters the ammonia-air mixing filter through the buffer tank, and the mixed gas is catalytically converted in the oxidation furnace to form nitrogen oxide gas; the nitrogen oxide gas enters the alkali absorption tower and reacts with the alkali liquid to synthesize sodium nitrite; part of the sodium nitrite mother liquor, alkali liquid, and nitric acid react in the conversion tower to produce sodium nitrate. The generated conversion gas is separated and sent back to the alkali absorption tower; it is then evaporated, concentrated, crystallized, and centrifuged to obtain the finished product.