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SODIUM DITHIONITE CAS N°: 7775, 14, 6, IPCS INCHEM processg of sodium dithionite and from Sodium dithionite Sodium hydrosulfite rapidly hydrolyzed and oxidized …

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Sodium dithionite (also known as sodium hydrosulfite) is a white crystalle powder with a weak sulfurous odor. It is the sodium salt of dithionous acid.

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Sodium hydrosulfite is manufactured the US by several process routes: the reaction of sodium formate (HCOONa) with caustic soda and sulfur dioxide, an aqueous methanol solution; by reducg sodium bisulfite (NaHSO3) with electrolytically produced sodium amalgam (NaxHgx); or by reactg sulfur dioxide solution with an aqueous slurry of zc dust and then convertg the zc salt to sodium hydrosulfite with soda ash or caustic soda.

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The process uses a solution of sodium borohydride and sodium hydroxide to reduce sulfur dioxide, and produce sodium hydrosulfite solution. Chemtrade Logistics is the only US manufacturer of powder sodium hydrosulfite. Its plant Leeds, S.C. has an annual powder capacity of 45,000 tons and 20,000 tons of liquid product, 100 percent basis.

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In textiles, the primary usage is processg vat dyes and digo dyes. Other applications clude water treatment, leather processg and food bleachg (sugar, honey and gelat). As a reducg agent ,it is used organic synthesizg . Hazards Solid sodium hydrosulfite is highly stable when stored dry closed contaers.

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Sulfur dioxide gas usage is restricted mostly to large treatment plants and sodium bisulfite is used at most small and medium-sized systems, but it is also used at large systems. Sulfur dioxide gas is the reagent of choice for larger systems due maly to its lower chemical cost (at high feed rates it is nearly 50% less expensive, see Section 6.3.2).

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