Patent ID: 6780385
Filing Date: 2004-08-24
Classification: B01D

Abstract:
A method comprisingcontacting a powder with a gas comprising SO2 and a SO3 component to remove the SO3 component from the gas without removing the SO2, wherein said powder comprises a sodium carbonate powder having a mean particle diameter of at most 20 &mgr;m and an anti-caking agent in an amount of from 0.1 to 5 mass % based on the sodium carbonate powder, wherein the sodium carbonate powder is present in an amount of from 0.5 to 8 mols per mol of the SO3 component in the gas, wherein the gas is formed by combustion of a fuel comprising sulfur and comprises SO2 in an amount of at least 500 vol. ppm, and wherein the concentration of the SO3 component in the gas is reduced to a level of at most 2 vol. ppm as reduced to SO3 after contact of the gas with the powder.