Abstract: Disclosed is a new PSA cycle that treats N2-contaminated natural gas at relatively high pressure, and yields a first product enriched in less strongly adsorbed components such as, for example, N2, and others (e.g., helium=He), and a second product that is enriched in more-strongly adsorbed components including, for example, CH4 and others (e.g., ethane=C2H6). The new PSA cycle is characterized by: low power consumption and low adsorbent mass, and therefore relatively small adsorbers. Briefly, a five-adsorber, PSA process separates a gas mixture into a first gas product, which is enriched in a first less-strongly adsorbed component, and a second gas product, which is enriched in more-strongly adsorbed components. The second gas product may be obtained by combining effluents obtained from a series of discrete steps.

Abstract: A multi-step process for removing CO2 from a process gas stream having CO2 and other gaseous components commences by adjusting the temperature of a CO2 laden process gas stream to be between about 80° and about 500° C. A first part of the temperature adjusted process gas stream is taken and contacted with a adsorbent in thermal contact with a heat-exchange surface. The remainder of said temperature adjusted process gas stream is taken and contacted with said heat-exchange surface to transfer heat to said adsorbent, thus causing any adsorbed CO2 to be desorbed for collection, and to cool said process gas stream remainder and removing any condensate from said cooled process gas stream remainder. The cooled process gas stream remainder is passed in contact with a cooled section of said adsorbent to adsorb CO2 therefrom, producing a CO2 depleted process gas stream. The desorbed CO2 is withdrawn for collection.

Abstract: Methane product gas is produced from landfill gas and gob gas either by a three-stage process of PSA-TSA-PSA or PSA-PSA-PSA, or a two-stage process of PSA-PSA.

Abstract: Methane product gas is produced from landfill gas and gob gas either by a three-stage process of PSA-TSA-PSA or PSA-PSA-PSA, or a two-stage process of PSA-PSA.