PROCESS AND APPARATUS FOR THE SEPARATION OF CARBON DIOXIDE AND HYDROGEN

摘要

The present invention is directed to a separation process and apparatus, wherein CO2 is separated from a gaseous feed stream comprising CO2 and H2 , and comprises the steps of: (i)cooling and partially condensing the feed stream; (ii)passing the cooled and partially condensed feed stream from step (i) to a first vapour-liquid separator to produce a vapour stream having increased H2 content relative the feed stream and a liquid stream having increased CO2 content relative to the feed stream; (iii)expanding at least a portion of the liquid stream from step (ii); (iv)passing the expanded stream from step (iii) to a second vapour-liquid separator to produce a vapour stream having increased H2 content relative the liquid stream from step (ii) and a liquid stream having increased CO2 content relative to the liquid stream from step (ii); (v)expanding and heating a first portion of the liquid stream from step (iv); wherein cooling in step (i) is provided at least in part by heat exchange during heating of the first portion of the liquid stream from step (iv) in step (v).