CO2 and SO2 Capture Method

Process for capturing CO2 and SO2 consisting of the following stages:

• a) introduction of one aqueous current of calcium hydroxide and another of gaseous carbon dioxide into a bubble column scrubber-reactor to form calcium carbonate;
• b) introduction of the calcium carbonate from stage a) into a bubble column scrubber-reactor in which a current of a gaseous mixture of carbon dioxide and sulphur dioxide is introduced to form calcium sulphite and carbon dioxide;
• c) transformation of the calcium sulphite of stage b) into the sulphate of this metal by oxidation with air;
• and
• d) recirculation the unreacted carbon dioxide, produced in stage b) by reaction with the slurry with sulphur dioxide, into the reactor of stage a);
• wherein an additional stage e) is performed in which alkali metal sulphate obtained as waste from any industry and/or the sulphate from stage c) is made to react with a caustic soda solution to obtain calcium hydroxide and a solution of sodium sulphate.