Patent ID: 6221131
Filing Date: 2001-04-24
Classification: B01D

Abstract:
A process for the separation and/or recovery of gases from gas and/or gas vapour mixtures by means of a membrane separating device to which the gas and/or gas vapour mixture is supplied, characterised by a multi-stage, simultaneous separation of such gas and/or gas vapour mixtures in the membrane separating device, by two different membrane types, one type being at least one organophilic membrane, the at least one such membrane unit separating the gas and/or gas vapour mixture into a pressure-reduced permeate enriched with desired condensable gas(es)/gas vapours and a retentate enriched with desired gas(es) of small kinetic diameter at essentially the same pressure set at the inlet end of the organophilic membrane unit(s), combined with at least one glassy membrane, the at least one such glassy membrane unit separating the retentate from the organophilic membrane unit(s) in the membrane separating device into a pressure-reduced permeate enriched with the desired gas(es) of small kinetic diameter and a retentate enriched with such desired condensable gas(es)/vapours at essentially the same pressure set at the inlet end of the glassy membrane unit(s).