Patent ID: 8728181

Claim:
A system for producing hydrogen from a gas mixture, comprising a gas input, at least a first and a second stage and a hydrogen collecting circuit, wherein each of said stages comprises: a stage inlet, a reactor, a separator, a stage outlet and a collector, said stage inlet being connected to said reactor to provide gas mixture, and said reactor outputting a purified mixture comprising hydrogen and remaining gas mixture to said separator, said separator comprising a flow space for circulating said purified mixture to said stage outlet, said separator further comprising at least one hydrogen extraction membrane contacting said flow space for extracting hydrogen from said purified mixture, said collector being arranged for collecting purified hydrogen from said at least one hydrogen extraction membrane, said collector being connected to said hydrogen collecting circuit, said at least first and second stages being arranged in series with respect to the gas mixture flow direction, the stage inlet of the first stage being connected to said gas input, and the stage outlet of the first stage being connected to the stage inlet of the second stage; further comprising two coaxial enclosures which delimit between them an intermediate space divided by annular partitions into a plurality of annular compartments which form said reactors, the inner enclosure comprising hydrogen separation modules forming said hydrogen extraction membranes, said hydrogen separation modules being respectively positioned between couples of corresponding consecutive annular partitions and defining a plurality of gas mixture flow compartments forming said flow spaces, each of the flow compartments communicating via two opposite ports provided in the inner enclosures with two consecutive annular compartments.