NOVELTY - The process comprises treating a mixture of gases to remove hydrogen sulfide, compressing and/or cooling the mixture of gases in a compressor and a heat exchanger to a temperature of -40 to -50 degrees C and elevated pressure of 80-250 bar at which the first component condenses and a two-phase gas-liquid mixture is formed, separating the two-phase mixture formed into separate liquid first and gaseous second component fractions in a fractionation unit, and extracting residual first component from the separated gaseous second component fraction by scrubbing the second component fraction.    USE - The method is useful for separating a relatively condensable first component from a mixture of gases including the first component comprising gases consisting of carbon dioxide, carbonyl sulfide and hydrogen sulfide and a relatively non-condensable second component comprising gases consisting of hydrogen, methane, ethane, carbon monoxide, nitrogen, oxygen and synthesis gas (claimed).    ADVANTAGE - The method is capable of efficiently separating the relatively condensable first component from the mixture of gases with reduced energy consumption and reduced plant footprint.    DETAILED DESCRIPTION - The process comprises treating a mixture of gases to remove hydrogen sulfide, compressing and/or cooling the mixture of gases in a compressor and a heat exchanger to a temperature of -40 to -50 degrees C and elevated pressure of 80-250 bar at which the first component condenses and a two-phase gas-liquid mixture is formed, separating the two-phase mixture formed into separate liquid first and gaseous second component fractions in a fractionation unit, extracting residual first component from the separated gaseous second component fraction by scrubbing the second component fraction at elevated pressure with an physical solvent such as methanol in a scrubber, and warming and expanding the scrubbed second component fraction using a heat exchanger to exchange heat with the mixture of gases and a turbo-expander for recovering mechanical work. The carbon dioxide solvent separation step is carried out at a pressure of 120 bar which is not more than the pressure at which the two-phase separation step occurs. The first component (50 %) is separated from the two-phase mixture. The method further comprises separating the first components from the mixture of gases before forming the two-phase gas-liquid mixture, feeding the second gaseous component stream to a solvent separation apparatus (118) including a solvent and adapted for separating a first component stream from the received gas mixture, and feeding the first component stream from the solvent separation apparatus to the phase separation apparatus. The hydrogen sulfide separation step comprises biological process. INDEPENDENT CLAIMS are included for:    (1) a gas separation plant for separating a mixture of gases into a relatively condensable first component and a relatively non condensable second component; and    (2) a system for separating a relatively condensable first component from a mixture of gases including the first component and a relatively non-condensable second component.    DESCRIPTION OF DRAWING(S) - The figure shows a flow diagram of a process for separating a relatively condensable first component from a mixture of gases.    Carbon dioxide separation unit (102)    Mixed gas stream (108)    Liquid carbon dioxide stream (114)    Solvent separation apparatus (118)    Hydrogen rich product stream. (122)