Patent ID: 8287626

Claim:
A method for treating a gas mixture containing acid gases, comprising: contacting the gas mixture with an absorbing solution, by which a de-acidified gas mixture and an absorbing solution loaded with acid gases may be obtained; and regeneration of the absorbing solution loaded with acid gases; wherein the regeneration comprises the following steps: passing the absorbing solution into a first regenerator at a first pressure; passing the absorbing solution into a second regenerator at a second pressure, less than the first pressure; compressing the gases from the second regenerator and recycling the thereby compressed gases to the first regenerator; subsequent to passing into the second regenerator, passing the absorbing solution into a third regenerator at a third pressure less than the second pressure; and compressing the gases from the third regenerator and recycling the thereby compressed gases to the second regenerator; wherein at least a portion of the gases from the second or the third regenerator is drawn off in order to provide a gas mixture rich in hydrogen sulfide and at least a portion of the gases from the first regenerator is drawn off in order to provide a gas mixture rich in carbon dioxide.