Sodium Formaldehyde Sulfoxylate Hydrate

Sodium Formaldehyde Sulfoxylate Hydrate

CAS No. 149-44-0, the formula CH3NaO3S, white crystal. Fresh odorless, but soon out of the smell like garlic, case of acid quickly decomposed, soluble in water. Insoluble in anhydrous ethanol, ether, benzene, dark, cool and dry place, sealed, with toxicity, to avoid direct contact, is a chemical intermediates.

Uses: used as printing and dyeing dyestuffs, styrene butadiene rubber and synthetic resin activator, organic decolorization and bleach, etc.

resolve resolution
286 kg of zinc powder, 500 kg of water into the beating tank, into the slurry after adding the tube reactor, the circulating absorption of about 550 kg of SO2, the preparation of zinc bisulfite (the reaction temperature maintained at 40 ~ 45 ℃, the end PH value of 3 to 3.5). The other 698 kg of 40% formaldehyde added to the reactor, stirring add the above-mentioned zinc dithionite solution, and gradually warming up, when the temperature rose to 95 ~ 100 ℃ by adding zinc powder in batches of 257 kg, For several hours, the end point is less than 1% of the untreated content. The precipitate was allowed to stand and the precipitate was transferred to a replacement kettle. After washing with water, add 42% sodium hydroxide solution 755 kg under stirring. The reaction was carried out at 65 ° C until the free base was 0.3% to 0.5%. The reaction was filtered off and the filtrate was clarified for 48 h and then concentrated in vacuo. Cooling crystallization, crushed after the finished product

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