Sodium sulfite reacts with high-concentration SO2 to produce sodium pyrosulfite
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Sodium carbonate is used to absorb SO2 from the flue gas, producing a saturated sodium sulfite solution, which is then transferred to an absorption tank where it undergoes three stages of absorption reactions with high-concentration SO2 to yield sodium pyrosulfite. However, the temperature does not rise during the reaction between sodium hydrosulfite and SO2, as the temperature being below 45 degrees prevents the formation of pyrosulfite products. Isn’t this reaction exothermic? Why can’t the temperature rise? Solve. . .
The heat released by an exothermic reaction is not necessarily sufficient to raise the temperature of the aqueous solution to a certain level. Moreover, the reaction also needs to be activated; only when certain conditions are met and the reaction becomes intense does more heat being released
Because the temperature has not reached the optimal reaction temperature, the reaction proceeds very slowly
{:3_59:} I recommend using liquid caustic; after it absorbs the moisture, the temperature can reach 60-70 degrees. A 15-20% dilute alkali solution will suffice. Your sodium carbonate is too mild for this purpose. In any case, the cost of sodium carbonate and liquid caustic is roughly the same, and liquid caustic also saves on labor costs
{:3_54:} If you can get your hands on a sodium carbonate solution, you can add some lye to it yourself to raise the temperature of the sodium sulfite solution
Original poster, my company specializes in the production of sodium metabisulfite filtration centrifuges; if you’re interested, feel free to send me a private message{:3_53:}
Sodium carbonate solution can be prepared using a trough, right?
Liquid caustic seems to affect the water balance; currently, the water used to prepare sodium carbonate solutions is supplied by the system itself.
What to do if the sodium metabisulfite content won’t increase? Please help
Can sodium metabisulfite be used in food factories?