Method and apparatus for treating a gas mixture

摘要

A method and apparatus is defined (100) for treating a starting gas mixture comprising carbon dioxide, sulphur dioxide and water wherein the method comprises forming a fraction predominantly or exclusively containing carbon d1ox1de. The starting gas mixture is enriched in carbon dioxide and depleted in sulfur dioxide and water in a first group (10) of method steps forming an intermediate gas mixture, the first group (10) of method steps including compressing (11), cooling (12, 13), condensating and drying (13) steps. The intermediate gas mixture is submitted to a second group of method steps (20). The second group (20) of method steps including absorbing (21, 22) steps in which liquid carbon dioxide is used to absorb sulphur dioxide from the intermediate gas mixture, the liquid carbon dioxide being formed from carbon dioxide contained in the intermediate gas mixture after treatment in the absorbing steps (21, 22).