DUAL ABSORPTION SULFURIC ACID PROCESS

摘要

A dual absorption sulfuric acid process is provided, with intermediate scrubbing of the process gas stream to remove sulfur trioxide, in which the residual gas stream after intermediate scrubbing is heated to a temperature which is about 10 DEG C. to 50 DEG C. higher than the temperature of the initial hot process gas passed into the first stage of catalysis. The sulfur dioxide content of the heated residual gas stream is thus catalytically oxidized to sulfur trioxide using reduced amounts of catalyst.