METHOD OF SULFUR ACID PRODUCING Russian patent published in 1995 - IPC

FIELD: chemical technology. SUBSTANCE: method involves the stages of sulfur combustion in atmosphere of technical oxygen, oxidation of sulfur dioxide prepared to sulfur trioxide, absorption of the latter, recirculation of exhaust gases from absorption stage to the stage of sulfur combustion and/or to the oxidation stage of SO₂ and blowing of recirculating gas part. SO₂ containing in the blowing gas is subjected for combustion, separated and recovered to the process. Method is used for sulfuric acid production by cyclic scheme. EFFECT: decreased exhaust of SO₂ in atmosphere. 2 cl, 2 dwg, 1 tbl