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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 hydroxide is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner. Worldwide production in 2004 was approximately 60 million tonnes, while demand was 51 million tonnes.