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Sodium hydrosulfite is the common commercial name for products containing sodium dithionite, Na 2 S 2 O 4, as the effective ingredient. China is by far the largest producer of the dry product producing 30% of the world's capacity. There are main two conventional approaches to produce sodium hydrosulfite. (i) Sodium hydrosulfite is prepared by the reaction of sodium bisulfite with zinc by the following reaction:
Chemically, sodium bisulfite is a combination of sodium, hydrogen, sulfur and oxygen. It is also called sodium hydrogen sulfate, and is classed as a sulfite, or sulfur-based chemical.Its natural form is a white crystalline powder, but turns yellow in solution.ood Industry. Sodium bisulfite is used to preserve color and inhibit bacterial growth on fruits and vegetables, some seafood and in wine. It was once favored for preserving produce because it kept vitamin C from breaking down, but it not in meat because it destroys vitamin B1.