Process for purifying a sulfur dioxide containing gas with produ

Details Process for purifying a sulfur dioxide containing gas with produ Process for purifying a sulfur dioxide containing gas with produ

1976-08-26

1979-11-13

Vertiz, O. R.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423242, C01B 1700, C01B 1702

Patent

active

041743830

ABSTRACT:
Process for purifying SO.sub.2 -containing gas comprising a first step of contacting said gas with an aqueous solution of an ammonium sulfite or an ammonium thiosulfate also containing ammonium sulfate, a second step of contacting the resulting solution with a H.sub.2 S-containing gas at 20.degree.-90.degree. C. to produce sulfur which is separated from the remaining solution, a third step of recyling 90 to 99.99% by volume of said remaining solution to the first step, and a fourth step of introducing 0.01 to 10% by volume of said remaining solution into a molten salt formed of ammonium sulfate and/or bisulfate so as to produce a gas containing SO.sub.2, ammonia, sulfur and steam, which is recycled to the first step.

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