| http://www.w3.org/ns/prov#value | - The invention is particularly applicable to the case in which it is necessary to produce gases of high purity (for example nitrogen, hydrogen, . . . ) or to the case of the separation of hydrogen from a gaseous medium containing at least one of the gases of the group consisting of CO and hydrocarbons of the formula Cx Hy, such a gaseous medium coming for example from a steam reforming unit or from
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