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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:
Sodium Sulfite. Sodium Sulfite, Commercial, Anhydrous is an economical chemical for the sulfite pulping of wood in manufacturing various grades of paper. It is also a source for sodium sulfide used in Kraft pulping. Sodium Sulfite is oxidized to sodium sulfate and is used to remove oxygen from boiler feed water.It should be considered for applications in which oxygen dissolved in water may increase equipment corrosion, e.g. process cooling water in chemical and allied industries, and in oil well drilling equipment.odium Sulfite is oxidized to sodium sulfate and is used to remove oxygen from boiler feed water. It should be considered for applications in which oxygen dissolved in water may increase equipment corrosion, e.g. process cooling water in chemical and allied industries, and in oil well drilling equipment.