Sodium bisulphite
General Product Information
| Article | Sodium bisulphite (38%-40% solution) |
| Synonyms | Sodium hydrogen sulfite |
| CAS No. | 7631-90-5 |
| EEG No. | 016-064-00-8 |
| EINECS No. | 231-548-0 |
| IMO | – |
| Tariff Code | 28321000 |
| UN No. | – |
| VLG/ADR | – |
Description
Sodium bisulfite solution is an aqueous solution of sodium hydrogen sulfite, a widely used chemical in various industrial processes. It is mainly used for its reducing properties and as a preservative. Sodium bisulfite occurs in various concentrations (usually between 20% and 40%) and is an essential ingredient in the water treatment, chemical and textile industries.
Characteristics
- Odor: Sulfur dioxide-like.
- Grade: Technical.
- Weak reductant: Works well as a remover of oxygen and chlorine.
Physical & Chemical Properties
| Chemical Structure | NaHSO3 |
| Molar Weight | 104.06 g/mol |
| Melting Point | Approx. 150°C (depending on Shape). |
| Boiling Point | – |
| Solubility | Highly soluble in water. |
| Density | 1.4 g/cm³ (depending on concentration) |
| Refractive Index | – |
| pH | 3.5 – 5.0 (at 10% solution) |
| Color | Colorless to light yellow |
| Shape | Liquid (38%-40% solution) |
Applications
Sodium bisulphite solution is applied in various ways, for instance:
1. Chemical Industry
As a reducing agent in chemical processes, including the production of certain drugs and other industrial chemicals.
2. Textile Industry
In the textile and paper industries, sodium bisulfite is used as a bleaching agent for cotton bleaching and as an auxiliary agent in paper processes.
3. Water Treatment
It is used in water treatment to remove excess chlorine and oxygen, especially in boiler water and process water.
4. Photography
It is used as a preservative and developer in Photography.
5. Mining
Sodium bisulfite is also used to neutralize cyanide in gold and silver mining.
Interessing Links
- CAS Common Chemistry – Sodium bisulfite
- European Chemicals Agency (ECHA) – For chemical information and regulations.
- European Food Safety Authority (EFSA) – Information about safety and application of food additives.
- PubChem – Sodium Bisulfite of the National Library of Medicine by the National Center for Biotechnology Information.
- Wikipedia – Sodium bisulfite