biggest producer of sodium hydrosulfite
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: