Patent ID: 7722702

Claim:
A purification process for a feed gas stream containing at least one contaminant in which the at least one contaminant in the feed gas stream has a concentration of ≦1000 ppm, the process comprising: passing the feed gas stream through a layer containing a mixture layer comprising a selective material for removal of the at least one contaminant and a less selective material having a lower selectivity toward the at least one contaminant relative to the selective material; wherein the mixture layer has a thickness dimension (L ML ) in a direction of the feed gas stream flow of the mixture layer, the (L ML ) being less than or equal to a length of a fully developed mass transfer zone (L MTZ ) at the end of the adsorption step, in which the L MTZ is defined by conditions of the process and the selective material; and wherein the removal of the at least one contaminant results in a purified product containing the at least one contaminant at a concentration ≦1 ppm.