[Help] Issues with exhaust gas treatment of sulfur dioxide
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Treatment of sulfur dioxide emissions: The treatment of sulfur dioxide-containing exhaust gases has always been a challenge; it is difficult to find an economical and feasible method. Let’s discuss any good ideas and suggestions.
When the quantity is large, it is used to produce sulfur or sulfuric acid; many industries have a specific need for SO2. When the quantity is small, lime is used to absorb it, and the waste material is utilized as building material.
It can be absorbed by water; Ca(OH)2 can be used for absorption, while alkaline solutions (such as NaOH) yield the best results. Absorption with soda ash can produce 34% sodium bisulfite. The water absorption effect is poor. Sulfur dioxide in exhaust gases can be absorbed using various methods. On one hand, acid-base neutralization can be employed, while on the other hand, redox reactions can be used for neutralization, such as by adding potassium permanganate or hydrogen peroxide. For both of these methods, a spraying approach yields better results during absorption. In the case of exhaust gases from small and medium-sized boilers, calcium-based absorbents can be used; the calcium oxide produced by these absorbents reacts with sulfur dioxide generated during combustion to form sulfates. For the exhaust gas that has already been released, lime slurry, limestone milk, and soda ash solution can be used
Hydrogenate the off-gases! Reduce them to hydrogen sulfide for use in sulfur recovery to produce sulfur.
What does the original poster mean by exhaust fumes? Without any relevant information, it’s only possible to make random guesses, and no proper solution can be devised.
Multiple stages of washing with circulating wash water – this could help increase the sulfuric acid concentration after washing. If a certain concentration is reached and there are few impurities, then it should be possible to sell it
Does water absorption turn it into sulfuric acid? ? ?
To produce sulfuric acid, it is necessary to raise the hydrogen sulfide concentration to over 10%, burn it, and catalytically convert it into sulfur trioxide; after cooling, sulfuric acid can be produced. Topsoo Corporation possesses proprietary technology for this process, which is widely used in China at present, with excellent results and low environmental impact.
Use a slurry of magnesium oxide to absorb it