Cradle to Gate
Identity ID
fe6b8079-1dbf-4e4f-bd46-360fb9998ca6
Materials
Associated ID
1ef9f3f9-b8f4-46bf-84b5-b11b11ba6ab9
Included activities starts
Included activities ends
Description
Sodium bisulfite is mainly used as a bleaching agent, preservative, antioxidant and bacterial inhibitor; 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 sulfur incineration, furnace-gas cooling and water washing, three-stage absorption and other processes.
Activity Description
The production activities of this product include sulfur combustion, furnace gas cooling and water washing, three-stage absorption, and other processes.
Process Description
Sodium bisulfite, chemical formula is NaHSO3, CAS number is 7631-90-5. It is solid under normal temperature and pressure conditions, and is a white crystalline powder with a faint sulfur smell. It is easily soluble in water, and the aqueous solution is acidic. Mainly used as bleach, preservative, antioxidant, and bacterial inhibitor.
Time period
2019
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The purchased sulfur raw material enters the sulfur burning furnace through hoppers, feeders, and other equipment. Meanwhile, air is introduced to burn the sulfur to generate SO2. The generated SO2 enters the furnace gas cooling and water washing process. The high-temperature furnace gas is first cooled by the furnace gas cooler with circulating cooling water, then cooled and humidified through washing in the scrubber, and then enters the absorption process via the gas-liquid separation tank. The process water used in the water washing tank is recycled, and acidic wastewater is discharged. Fresh water is then replenished for continued use. The wet furnace gas containing SO2 enters the three-stage absorption process, where it reacts with a Na2CO3 solution. The tail gas is treated and discharged through a high stack, and the separated liquid from the gas-liquid separator is returned to the absorber. The resulting NaHSO3 solution enters a storage tank. The core reaction chemical equation of this process is: Na2CO3 + 2SO2 + H2O = 2NaHSO3 + CO2.