Process for the removal of sulfur dioxide from flue gas and for the production of an absorption agent for sulfur dioxide and absorbent

摘要

A stack gas, generally from a sulfuric acid plant, containing SO2, is contacted with an absorptive medium prepared by wetting at least the surface of a first metal selected from aluminum, magnesium and manganese with a second metal selected from mercury, indium, gallium and alloys of indium/gallium and contacting the wetted first metal with SO2, in a solvent medium in the presence of an excess of hydrogen ions until the first metal erodes and is taken up by the solution as a result of the reaction which takes place. The absorptive medium thus formed has the ability to absorb SO2 at lower temperatures and thereafter desorb SO2 at increased temperature and/or with inert gas stripping. The SO2 enriched gas stream obtained as a result of the desorption process can be recycled to the sulfuric acid plant.