Process for selective absorption of chlorine and/or bromine from waste gases containing CO2 using water vapor

摘要

The invention relates to a process for selective absorption of chlorine and/or bromine from CO2-containing waste gases. The waste gas must contain at least 1 mol of SO2 per mol of Cl2 and/or per mol of Br2; if necessary, such a quantity of SO2 is added to the waste gas that the said relative quantity is present. For the absorption of the chlorine and/or bromine, the waste gas is mixed with steam and the mixture is then cooled until the steam condenses. An example of suitable apparatus is an upright pipe with an internal cooling coil.