Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1981-09-18
1984-06-12
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423242, B01J 800, C01B 1700
Patent
active
044541023
ABSTRACT:
Purification of gases from acid gas components according to the dry method means that the gas is contacted with an absorbent in a solid phase, which yields a relatively low reaction rate. In order to increase the reaction rate according to the invention, the gas is contacted with a mixture consisting partially of a solid absorbent phase and partially a liquid phase on the surface of the solid phase. At the purification of flue gases from sulphur dioxide hot gas is contacted with an absorption liquid in a drying apparatus, where evaporation of the water supplied and a reaction between sulphur dioxide and the absorption substance take place simultaneously, whereafter the solid product phase is separated from the gas in a dust separator and a slower, secondary absorption reaction is operative. In order to achieve a higher reaction rate in the dust separator, a substance is added to the flue gas which, together with other chemical species derived from the gas or the solid absorbent forms a liquid phase distributed over the surface of the solid phases. The liquid phase usually contains water and has a good solubility for reactants and reaction products.
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Ahman Stefan O. H.
Lindau Leif V.
Flakt Aktiebolag
Heller Gregory A.
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