Integrated process for dialkyldisulfides treatment

A method for treating a hydrocarbon gas stream containing H2S and mercaptans, the method comprising:

• a) separating the hydrocarbon gas stream into a sweet hydrocarbon gas stream and an acid gas stream comprising H2S,
• b) concentrating the mercaptans in at least one cut of said sweet hydrocarbon gas stream;
• c) extracting the mercaptans from the said cat and converting into dialkyldisulfides;
• d) passing the acid gas stream comprising H2S in a Claus unit, thereby producing a sulphur-containing stream and a Claus tail gas stream comprising SO2, which stream is then passed in a hydrogenation reactor to convert SO2 into H2S and then passed in an absorber for removing H2S,
• wherein:
• e) the dialkyldisulfides formed at step c) are reacted with a hydrogen containing stream in said hydrogenation reactor or in a second hydrogenation reactor, thereby generating a gas stream comprising H2S, wherein:
• said hydrogen-containing stream is produced by a hydrogen generator, and/or
• said hydrogen-containing stream is produced by the Claus unit, thereby being present in the Claus tail gas stream before or after the hydrogenation reactor, and
• f) the gas stream comprising H2S formed at step e) is passed in the absorber for removing H2S.