Anhydrous Sodium Sulfite 94-95%, 96%, 97%
Bell Chemical is a professional anhydrous Sodium Sulfite Manufacturer in China. we can supply 94-95%, 96%, 97% sodium sulfite, for food and industrial uses. As a leading sodium sulfite supplier and exporter, we have obvious advantages in price and quality. please contact us to get a quote. We will provide sodium sulfite to you with excellent quality at best prices.
Anhydrou Sodium sulfite is an inorganic salt having the chemical formula as Na2SO3. It is an ionic compound that contains two sodium cations (Na+) and single sulfite anion (SO32- ). A saturated solution of sodium sulfite present in the water is mildly basic with a nearby pH value of 9. The primary application of Sodium Sulfite is in the paper and pulp industry.
Specification of Anhydrous Sodium Sulfite
| Item | National Standard | ||
| HG/T 2967-2000 | |||
| Top-grade | First grade | Qualified product | |
| sodium sulfite (Na2SO3),% | ≥97.0 | ≥96.0 | ≥93.0 |
| Fe,% | ≤0.003 | ≤0.005 | ≤0.02 |
| Water-Insoluble | ≤0.02 | ≤0.03 | ≤0.05 |
| Free alkali(As content Na2CO3),% | ≤0.10 | ≤0.40 | ≤0.80 |
| Sulfate(As content Na2SO4),% | ≤2.5 | – | – |
| Chloride(NaCl), content % | ≤0.10 | – | – |
Anhydrous Sodium Sulfite Applications
Anhydrous Sodium Sulfite is primarily used in the paper and pulp industry. In the past, sodium sulfite was used to make pulp in the paper industry, but its use now accounts for less than 10% of the total pulp production, and the number of sulfite mills continues to decrease.
As an oxygen scavenger agent, sodium sulfite industrial grade is used to treat water being fed to steam boilers to avoid corrosion problems, in the photographic industry, it protects developer solutions from oxidation and (as hypo clear solution) to wash fixer (sodium thiosulfate) from film and photo-paper emulsions.
As a reducing agent, sodium sulfite is used in the textile industry as a bleaching, desulfurizing, and dechlorinating agent (e.g. in swimming pools).
Sodium Sulfite is also used as a reagent in sulfonation and sulfomethylation agent. It is used in the production of sodium thiosulfate.
There is very little information on the environmental fate and effects of sodium sulfite and it is anticipated that, if released to water or soil, the effects would be negligible. Because it is used in small amounts as a food preservative, a very small percentage of the population is ‘sensitive’ to the chemical and may have an allergic reaction; some asthmatics may have a severe reaction following exposure. There are no environmental standards or regulations for sodium sulfite as it is ‘generally recognized as safe’ when used as a chemical preservative.