PROCESS FOR THE PRODUCTION OF SULPHURIC ACID

摘要

Process for the separation of sulphur oxides from off-gases comprising the steps of: (a) passing off-gas through at least one moving bed of sulphur oxide absorbent having catalytic activity in the oxidation of sulphur oxides to sulphur trioxide and comprising supported on a carrier a mixture selected from the group consisting of vanadium and sulphates of one or more alkali metals, vanadium and pyrosulphates of one or more alkali metals, vanadium in addition to sulphates and pyrosulphates of one or more alkali metals; (b) converting the sulphur oxide to sulphur trioxide and absorbing sulphur trioxide on the absorbent; (c) regenerating the sulphur trioxide loaded absorbent by passing the absorbent through at least one pneumatic transporter prior to entering the at least one moving bed of step (a) and withdrawing a stream of stripping gas from the at least one pneumatic transporter; (d) removing desorbed sulphur trioxide in the stripping gas of step (c) by formation of sulphuric acid and/or oleum in a sulphuric acid condenser and withdrawing sulphuric acid and/or oleum product from the process.