Cradle to Consumer
Identity ID
252b5db8-547f-48d3-9f10-68d74bf604af
Materials
Associated ID
8a9dc541-86db-4413-ba85-566e8ecc34ed
Included activities starts
Included activities ends
Description
This dataset is a market dataset, representing the consumption market of the region; the dataset includes the transport of the product from the gate to the consumer end, and the transport service is calculated according to the transport situation of this product in this region. Sodium sulfite is a white crystalline powder or granule, widely used in the chemical industry, the food industry and the paper industry; the dataset contains the main raw and auxiliary materials, energy, atmospheric emissions and waste of the production process, and infrastructure such as the manufacture of production equipment and the construction of plant buildings is not included within the dataset boundary; in this dataset, sodium bicarbonate is modelled as a pure substance, and when modelling this substance in solution the user needs 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, neutralisation, evaporation and crystallisation, and drying.
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,Beijing
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.