FIELD: purification of industrial gases, chemical industry, sulfuric acid production. SUBSTANCE: exhaust gases are purified from sulphur dioxide by absorbing latter with sulphur trioxide at 17-44 C under excessive pressure, followed by washing off-gases with water or sulfuric acid and by converting absorbent saturated with sulphur dioxide to sulfuric acid. If absorption treatment is carried out using cyclic process, portion of absorbent saturated with sulphur dioxide is separated from process cycle, sulphur dioxide is recovered from process liquor, whereupon absorbent is recirculated back to process cycle. EFFECT: better purification of industrial gases; higher sulfuric acid recoveries. 2 cl, 3 dwg
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