Patent ID: 7531154

Claim:
A method of removing SO 2 from a flue gas stream comprising SO 2 , comprising: providing a source of trona, wherein the mean particle size of the trona is less than about 40 micron; injecting the trona into the flue gas stream, wherein the trona is injected at a rate with respect to the flow rate of the SO 2 to provide a normalized stoichiometric ratio of sodium to sulfur of between about 1.0 and about 1.5, further wherein the temperature of the flue gas is between about 630° F. and about 900° F.; and maintaining the trona in contact with the flue gas for a time sufficient to react a portion of the trona with a portion of the SO 2 to reduce the concentration of the SO 2 in the flue gas stream by at least about 78%.