NOVELTY - A steam reforming fuel processor adapted to produce a product hydrogen stream (34) containing pure hydrogen gas, comprises a separation assembly (20) comprising hydrogen-selective membrane(s) (46) and adapted to receive at least a portion of a reformate stream and to divide the portion of the reformate stream into a hydrogen-rich permeate stream comprising pure hydrogen gas and a byproduct stream (36) comprising at least a portion of the other gases, where the product hydrogen stream includes at least a portion of the permeate stream.    USE - For producing a product hydrogen stream containing pure hydrogen gas (claimed).    ADVANTAGE - Integrating the fuel processor or other source of mixed gas stream with hydrogen purification device enables the devices to be more easily moved as a unit. It also enables the fuel processor's components, including the purification device, to be heated by a common heating assembly and/or for at least some of the heating requirements of purification apparatus to be satisfied by heat generated by the processor.    DETAILED DESCRIPTION - A steam reforming fuel processor adapted to produce a product hydrogen stream (34) containing pure hydrogen gas, comprises a vaporization region adapted to receive and vaporize a liquid feed stream comprising a carbon-containing feedstock and water; a steam reforming hydrogen-producing region containing a steam reforming catalyst and adapted to receive the vaporized feed stream and to produce a reformate stream comprising hydrogen gas (26) and other gases (28), where the hydrogen gas forms a majority component of the reformate stream; a separation assembly (20) comprising hydrogen-selective membrane(s) (46) and adapted to receive at least a portion of the reformate stream and to divide the portion of the reformate stream into a hydrogen-rich permeate stream comprising pure hydrogen gas and a byproduct stream (36) comprising at least a portion of the other gases, where the product hydrogen stream includes at least a portion of the permeate stream; a combustion region adapted to receive and combust a fuel stream to produce a heated exhaust stream to heat at least the hydrogen-producing region; and fluid conduit(s) extending through the hydrogen-producing region and defining a passage extending through the hydrogen-producing region but not in contact with the steam reforming catalyst. The heated exhaust stream is adapted to flow through the passage to heat the hydrogen-producing region.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a hydrogen purification device.    Enclosure (12)    Internal compartment (18)    Separation assembly (20)    Mixed gas stream (24)    Hydrogen gas (26)    Other gases (28)    Mixed gas region (30)    Permeate region (32)    Product hydrogen stream (34)    Byproduct stream (36)    Heating assembly (42)    Membrane (46)