Process for the removal of SO.sub.2 from a stack gas, absorptive

Details Process for the removal of SO.sub.2 from a stack gas, absorptive Process for the removal of SO.sub.2 from a stack gas, absorptive

1976-07-27

1978-08-22

Thomas, Earl C.

Chemistry of inorganic compounds

Sulfur or compound thereof

Ternary compound containing hydrogen and metal

252189, C01F 768

Patent

active

041089693

ABSTRACT:
A stack gas, generally from a sulfuric acid plant, containing SO.sub.2, 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 SO.sub.2, 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 SO.sub.2 at lower temperatures and thereafter desorb SO.sub.2 at increased temperature and/or with inert gas stripping. The SO.sub.2 enriched gas stream obtained as a result of the desorption process can be recycled to the sulfuric acid plant.

REFERENCES:
patent: 4012487 (1977-03-01), Merkl

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