FORFARANDE FOR AVLEGSNANDE AV TILL SVAVELSYRA OXIDERBARA SVAVELFORENINGAR OCH TILL CO?712 OCH H?712O OXIDERBARA ORGANISKA FORENINGAR UR AVGASER FRAN SVAVELSYRAKONTAKTANLEGGNINGAR

摘要

Sulfur compounds oxidizable to form sulfuric acid and organic compounds oxidizable to CO2 and H2O are removed from an exhaust gas of a contact-process plant for producing sulfuric acid by treating the exhaust gas with a scrubbing solution consisting of dilute sulfuric acid and peroxydisulfuric acid. The peroxydisulfuric acid is produced electrolytically from fresh dilute sulfuric acid and the resulting electrolyte is continuously introduced into the scrubbing acid cycle. The exhaust gas is treated in a vertical venturi with uniflow, i.e. codirectional flow of the gas and the scrubbing solution, and the gas is then passed through a horizontal venturi and subsequently upwardly through a packing layer.