NOVELTY - Process for hydrogen production by reforming and/or partial oxidizing of organic products, involves carrying out, in a catalytic reactor, a steam reforming and/or partial oxidation of material composed of the organic products and steam to provide a product mixture enriched of hydrogen and carbon monoxide; and carrying out a water-gas shift reaction of the product mixture to produce a mixture enriched with carbon dioxide and hydrogen, and simultaneously separating the hydrogen from the reaction environment, in a membrane reactor.    USE - For production of hydrogen from reforming of organic compounds such as methane, ethane, methanol and ethanol (claimed); useful for hydrogen production for feeding fuel cells for mobile application (hydrogen engine vehicles) or fixed ones (energy production).    ADVANTAGE - The process enables to optimize reaction yields and costs with respect to a process in which a single membrane reformer is used both for the reforming reaction and for separating the hydrogen produced. The process is a two-stage process enabling the production of ultrapure hydrogen starting from hydrocarbons or other suitable products and steam. The process uses the membrane reactor having reduced number of palladium alloy permeator tubes used, resulting in a significant decrease in costs, size and weight; and uses the membrane reformer (in which the water gas shift (WGS) reaction takes place) in less onerous operating conditions (lower temperature) compared to some dehydrogenation reactions (e.g. ethanol reforming and partial oxidation). The modularity of the process makes it possible for it to be implemented for small-medium sized power levels (3-30 kW). The use of membranes that are not completely selective but of greater permeability makes this process applicable also in larger scale systems (100-500 kW), envisaging fuel cells (e.g. fused carbonate ones) that can be fed also by nonpure hydrogen.    DETAILED DESCRIPTION - Process for hydrogen production by reforming and/or partial oxidizing of organic products, involves carrying out, in a catalytic reactor, a steam reforming and/or partial oxidation of material composed of the organic products and steam to provide a product mixture enriched of hydrogen and carbon monoxide; and carrying out a water-gas shift reaction of the product mixture to produce a mixture enriched with carbon dioxide and hydrogen, and simultaneously separating the hydrogen from the reaction environment, in a membrane reactor. The steam reforming and/or partial oxidation reaction is carried out in a fixed-bed reactor or fluidized-bed reactor, with a steam reforming catalyst packing. The membrane is selectively permeable to hydrogen. The membrane selectively permeable to hydrogen is a dense metallic membrane, a porous membrane not completely selective to hydrogen or a composite membrane, with a selective metallic film supported on a porous layer. The membrane reactor includes a water gas shift catalyst packing. The membrane reactor is a shell and tube type reactor, with the tubes made out by the membranes selectively permeable to hydrogen and the water gas shift.    DESCRIPTION OF DRAWING(S) - The figure shows a simplified scheme of the process for the production of ultrapure hydrogen starting from reforming and/or partial oxidation operations of organic products.