Elimination of SO2 and CO2 from a gas

摘要

The present invention concerns a process to treat / clean a gas, containing SO2, CO2 and O2 comprising the steps of: a. Bringing the gas in contact with an activated carbon catalyst, converting SO2 to SO3 / H2SO4 on the activated carbon catalyst, washing the SO3 / H2SO4 from the activated carbon catalyst to obtain a sulfuric acid solution and a SO2 depleted gas; b. Bringing the SO2 depleted gas in contact with an aqueous ammonia solution wherein CO2 is converted to obtain a SO2 and CO2 depleted gas containing ammonia; c. Bringing the SO2 and CO2 depleted gas containing ammonia in contact with the sulfuric acid solution obtained in step a. to form a solution containing ammonium sulfate and a treated, clean gas.