Patent ID: 8591846

Claim:
A method for the processing of a carbon dioxide-rich acid gas in a Claus process, (a) an industrial gas to be freed from sulphur constituents and containing at least hydrogen sulphide and carbon dioxide as acid gas constituents is submitted to a first 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 content of sulphur constituents is obtained, and (d) the fraction of the highest content of sulphur constituents from step (c) is fed to the upstream Claus burner of the thermal reaction section of a Claus reactor, and the sulphur constituents contained being converted at least partially to form a sulphur dioxide (SO 2 )-containing gas by the aid of an oxygen-containing gas, and (e) the hot combustion gases are discharged into the reaction chamber downstream of the burner where they are mixed with at least one carbon dioxide-rich acid gas fraction from the regeneration unit.