C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
252/18, 23/348
C01B 17/60 (2006.01) B01D 53/14 (2006.01) C09K 3/00 (2006.01)
Patent
CA 1077914
ABSTRACT OF THE DISCLOSURE A stack gas, generally from a sulfuric acid plant, containing SO2, is contacted with an absorptive medium prepared by wetting at least the surface of a first metal selected from aluminum, magnesium and manganese with a second metal selected from mercury, indium, gallium and alloys of indium/gallium and contacting the wetted first metal with SO2, in a solvent medium in the presence of an excess of hydrogen ions until the first metal erodes and is taken up by the solution as a result of the reaction which takes place. The absorptive medium thus formed has the ability to absorb SO2 at lower temperatures and thereafter desorb SO2 at increased temperature and/or with inert gas stripping. The SO2 enriched gas stream obtained as a result of the desorption process can be recycled to the sulfuric acid plant.
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