Patent ID: 7175820

Claim:
A method for treating a natural gas containing H 2 S, wherein the following stages are carried out: a) contacting said natural gas with a first solvent comprising between 20% and 95% by weight of amine so as to obtain an H 2 S-depleted gas and an H 2 S-laden solvent, b) dehydrating the H 2 S-depleted gas by contacting the H 2 S-depleted gas obtained in stage a) with a second solvent comprising at least 90% by weight of amine so as to obtain a water-depleted gas and a water-laden solvent, regenerating the H 2 S-laden solvent obtained in stage a) and the water-laden solvent obtained in stage b) by a single regeneration circuit to form a regenerated solvent, and recycling a first part of the regenerated solvent to stage a) as the first solvent, and recycling a second part of the regenerated solvent to stage b) as the second solvent, wherein said amine of the first and second solvents is selected from the group consisting of tertiary alkanolamines having a low viscosity which facilitates contacting solvents with gas.