Cradle to Gate
Identity ID
85d26c5b-588b-4ca2-9d1f-e8533eee2d14
Materials
Associated ID
8a9dc541-86db-4413-ba85-566e8ecc34ed
Included activities starts
Included activities ends
Description
Sodium sulfite is a white crystalline powder or granule, widely used in the chemical industry, the food industry and the papermaking industry. The dataset includes the main raw and auxiliary materials, energy, atmospheric emissions and wastes of the production process, while infrastructure such as the manufacture of production equipment and plant construction is not included within the dataset boundary; in this dataset, sodium bicarbonate is modelled as a pure substance; when modelling this substance in solution, the user is required to add a solvent of their choice in the model; the data inventory is formed by merging data from multiple sources; the production activities of this product mainly include sulfur dioxide preparation, reaction with sodium carbonate, tail-gas treatment, neutralization, evaporation and crystallization, drying and other processes.
Activity Description
The production activities of this product mainly include sulfur dioxide preparation, reaction with sodium carbonate, tail gas treatment, neutralization, evaporation crystallization, drying and other processes.
Process Description
Sodium sulfite (chemical formula Na₂SO₃, CAS: 7757-83-7) is a white crystalline powder or granule with a slight sulfur smell. It is easily oxidized in the air and needs to be sealed and stored. As a strong reducing agent, its main uses include: in the chemical industry for organic synthesis reduction and deoxidation; in the food industry as a preservative and antioxidant for dried fruits, juices and wines; in the paper industry for pulp bleaching and dechlorination. In addition, it is also used in fields such as water treatment, photographic fixation, and textile bleaching and dyeing.
Time period
2015
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
At present, the mainstream process for producing sodium sulfite in China is the soda ash absorption method. The principle is to use sodium carbonate (soda ash, Na₂CO₃) solution to absorb sulfur dioxide (SO₂) gas, and then obtain sodium sulfite product after crystallization and drying. Core chemical reactions: Na₂CO₃ + 2SO₂ + H₂O → 2NaHSO₃ + CO₂↑; 2NaHSO₃ + Na₂CO₃ → 2Na₂SO₃ + H₂O + CO₂↑; NaHSO₃ + NaOH → Na₂SO₃ + H₂O.