PROCESS OF PRODUCING SULFURIC ACID

摘要

A catalytic SO2 oxidation produces a mixture of gases containing SO3 and H2O in a molar ratio of at least 1:1, and having a temperature of 300 ~C to 600 ~C. The mixture of gases is passed through a condenser, in which the mixture is cooled indirectly by a cooling fluid to a condenser outlet temperature of 180 ~C to 240 ~C. At least 50 % of the theoretically possible amount of sulphuric acid is formed, condensed and drawn off. The cooling fluid drawn off from the condenser has been heated to a temperature of at least 130 ~C, so that its energy content can be utilized. The gas mixture containing sulphur trioxide that is drawn off from the condenser is brought into direct contact with concentrated sulphuric acid at 60 ~C to 120 ~C, generating concentrated product sulphuric acid.