Patent ID: 8568676

Claim:
A method for the processing of a carbon dioxide-rich industrial gas to be freed from sulphur constituents, according to which (a) an industrial gas to be freed from sulphur constituents and containing at least hydrogen sulphide and carbon dioxide as acid gas constituents is first submitted to gas scrubbing using an acid gas-absorbing solvent which absorbs sulphur constituents more selectively than carbon dioxide, and (b) the laden solvent is fed to a regeneration unit for regeneration, and (c) the acid gas liberated in the regeneration and consisting of sulphur constituents and carbon dioxide (CO 2 ) is separated into at least two acid gas fractions, and at least one acid gas fraction of a higher portion of sulphur constituents is obtained, and (d) the fraction of the highest content of hydrogen sulphide (H 2 S) is fed to a Claus plant in which the major part of the hydrogen sulphide (H 2 S) contained is converted to sulphur, and (e) the sulphur compounds still contained in the Claus process gas leaving the Claus plant are almost completely hydrogenated to hydrogen sulphide (H 2 S) by a subsequent hydrogenation, thus obtaining a hydrogenated Claus process gas, and (f) at least one carbon dioxide-laden, hydrogen sulphide-poor acid gas fraction from the regeneration unit, which has a lower content of sulphur than the fraction of the highest content of hydrogen sulphide (H 2 S), is merged with the hydrogenated Claus process gas to form a joint process gas stream which is passed to further process steps or recycled to the process.