Cradle to Gate
Identity ID
4d12b950-a2ef-42bf-a3c8-61ca2125a5bf
Materials
Associated ID
8f89c3bd-ee52-4d9c-9dd1-8efa5cc4c6f0
Included activities starts
Included activities ends
Description
Sodium chlorite is mainly used for bleaching fabrics, fibres and pulp; it is a mild bleaching agent and can also be used for bleaching sugar, starch, oils and fats, ointments and waxes. It also has the function of treating bacteria in sewage and removing phenols and odours, and can be used in fields such as leather dehairing, the surface treatment of certain metals, and the purification of trace nitric oxide in coke-oven gas; The dataset includes the main raw and auxiliary materials, energy, atmospheric emissions, wastewater and solid waste of the production process, in which the preliminary treatment of wastewater in the utility/auxiliary processes and the waste-gas treatment process are included within the dataset boundary, 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 sodium chlorate solution preparation, the chlorine dioxide generation process, the chlorine dioxide absorption process, evaporation, crystallization, centrifugal separation, dehydration and drying, and the treatment of sodium chlorite production waste liquor and other processes. Sodium bisulfate is a by-product of this production process, allocated according to economic value.
Activity Description
The production activities of this product include the preparation of sodium chlorate solution, chlorine dioxide generation process, chlorine dioxide absorption process, evaporation, crystallization, centrifugal separation, dehydration and drying, sodium chlorite production waste liquid treatment and other processes.
Process Description
Sodium chlorite has the chemical formula NaClO2 and CAS number 7758-19-2. It is a white crystalline solid or crystalline powder that is readily soluble in water. Its alkaline solutions are stable under light, whereas acidic solutions may react explosively and release chlorine dioxide. It is a strong oxidizing agent and must be kept away from organic and reducing substances during storage to prevent explosions. It is mainly used as a mild bleaching agent for fabrics, fibers, and pulp, providing high whiteness without damaging fibers. It is also used to bleach sugar, starch, fats, ointments, and waxes; to control bacteria, remove phenols, and eliminate odors in wastewater; for leather dehairing and the surface treatment of certain metals; and to remove trace nitric oxide from coke-oven gas.
Time period
2019
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The production process of sodium chlorite includes electrolysis and reduction. The reduction method can be divided into sulfur dioxide method, hydrochloric acid method, sulfuric acid method, methanol method and hydrogen peroxide method according to the different reducing agents used. This data set uses hydrogen peroxide to reduce sodium chlorate to prepare chlorine dioxide.