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Removal of SO2 is difficult. The quantities emitted from surface chimneys can be lowered by using desulfurization plants.The gases are reacted with...

Sulfur dioxide emissions cause environmental problems such as acid rain and the technology used to remove sulfur dioxide from the exhaust gas of fossil-fuel power plants is called desulfurization.


There are several methods of removing sulphur dioxide from exhaust gases. The method which utilizes calcium hydroxide slurry to remove sulphur dioxide is called wet scrubbing and the main product of that reaction is calcium sulphite.


Ca(OH)2 (solid) + SO2 (gas) → CaSO3 (solid) + H2O (liquid)


Sulfur dioxide is an acid gas, so other alkaline sorbent slurries or materials such as calcium carbonate and magnesium hydroxide may also be used for wet scrubbing. A natural alkaline that may be used to absorb the sulphur dioxide is sea water.


Apart from web scrubbing using an alkaline sorbent, sulphur dioxide can be removed by spray-dry scrubbing, wet sulphuric acid, or dry sorbent injection systems, among others.

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