Device and process for separating methane from a gas mixture containing methane, carbon dioxide and hydrogen sulfide

摘要

A device for separating methane from a gas mixture containing methane, carbon dioxide and hydrogen sulfide, wherein the device is arranged upstream of a gas compressor, two or three membrane separation stages downstream of the compressor, and upstream of the membrane separation stages for hydrogen sulfide a hydrogen sulfide adsorber comprising a bed of activated carbon having a catalytic activity for oxidizing the hydrogen sulfide in the permeate from the second membrane separation stage receiving the retentate of the first membrane separation stage; Recirculation to a point upstream of the adsorber can be tuned for optimal adsorption capacity of the hydrogen sulfide adsorber.