Zinc Formaldehyde Sulfoxylate

Model Number: HMHT0033-11 Other Name: SFS; Rongalite C; Sodium Formaldehyde Sulfoxylate Hazard symbol: R36/37/38 Molecular formula: CH6Na2O5S Flash point: 223.8 ℃ EINECS: 205-739-4 CAS: 6035-47-8

Add 286 kg of zinc powder and 500 kg of water into the beating tank, and after pulping, add it into the tubular reactor, and absorb about 550 kg of SO2 to obtain zinc hydrosulfite. In addition, the formaldehyde of 698 kg 40% is added in the reactor, the above-mentioned zinc hydrosulfite aqueous solution is dripped under stirring, and gradually heats up, when the temperature rises to 95-100 ℃, add a total of 257 kg of zinc powder in batches, react under the insulation After several hours, when the content of unreacted substance is less than 1% at the end point, it is allowed to stand for precipitation, and the precipitation is transferred to the replacement kettle. After washing with clean water, add 755kg of 42% sodium hydroxide solution with stirring, react at 65°C until the free base content reaches 03%-0.5%, filter the reactant to remove impurities, and concentrate the filtrate in vacuo after clarification for 48 hours. Cool to crystallize and pulverize to get the finished product.