Abstract: Process and apparatus for removal of sulfur oxides from flue gases.In the process, a NaOH solution is injected into flue gases containing calcium oxide so that the formed reaction products are discharged from the reactor in a dry dust-like form together with the flue gases, whereafter the solids present in the flue gases are separated from the flue gases, mixed with water and sodium so as to form a sodium hydroxide solution wherefrom the other reaction products in solid form can be removed, the sodium hydroxide solution being returned to the flue gases.The apparatus comprises a desulfurization reactor (3) wherein a sodium hydroxide solution is injected into the flue gases, and an electrostatic precipitator (5) wherein the dust-like solids are separated from the flue gases.