I’m asking those who know about the production of sodium sulfite!
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This post was last edited by sunjl1981 on 2013-1-6 at 21:05. I read that anhydrous sodium sulfite tends to oxidize easily in air, but during its production, it is evaporated and crystallized in tanks at 95-100 degrees, and then dried in hot air. I don’t understand how, under such conditions, sodium sulfite isn’t oxidized I really need to know the answer urgently! ! ! Please, experts, give me some guidance! # + + . hcbbs
This post was last edited by Before drilling on 2012-2-29 00:18. Sodium sulfite is very stable and does not oxidize easily; it only tends to oxidize into sodium sulfate under the influence of humid air and sunlight. Your process operates at 95-100 degrees, during which all the moisture is evaporated, so sodium sulfite is not oxidized. However, the produced products must be stored in a sealed condition.
Gas containing sulfur dioxide is introduced from the bottom of the absorption tower, where it undergoes counter-current absorption with soda ash solution to produce a sodium bisulfite solution. This solution is then sent to a neutralization tank, and caustic soda solution is added slowly to raise the pH of the solution to 11–12. After decolorization and filtration, the clear liquid is subjected to evaporation crystallization and centrifugal dehydration, followed by air-drying at 250–300°C to yield sodium bisulfite. Sodium sulfite is easily oxidized to sodium sulfate in solution.