NOVELTY - Producing hydrogen from biogas (1), comprises providing raw biogas containing methane (45-70%), carbon dioxide (30-40%), nitrogen (15%) and traces of other components, purifying a first part of biogas to produce biomethane (5), steam-reforming biomethane to obtain synthesis gas containing e.g. methane, performing shift reaction to oxidize carbon monoxide in presence of water, separating components of dry synthesis gas in a pressure swing adsorption (PSA) unit, recycling all or part of the PSA residue to feed a burner of a furnace with secondary fuel, and supplying a primary fuel to burner.    USE - The process is useful for producing hydrogen from biogas.    ADVANTAGE - The process ensures economic and simple production of hydrogen from biogas with low carbon monoxide production.    DETAILED DESCRIPTION - Producing hydrogen from biogas (1), comprises providing raw biogas containing 45-70% of methane, 30-40% of carbon dioxide, 15% of nitrogen and traces of other components, purifying a first part of biogas to produce biomethane (5), steam-reforming the biomethane to obtain synthesis gas containing hydrogen, carbon monoxide, carbon dioxide, methane, water vapor and impurities, performing shift reaction to oxidize carbon monoxide in presence of water to produce hydrogen, separating the components of dry synthesis gas in a pressure swing adsorption (PSA) unit to produce hydrogen-rich flow and waste gas flow from the PSA unit, recycling all or part of the PSA residue to feed a burner of a furnace with secondary fuel, and supplying a primary fuel, which is obtained from a secondary part of optionally purified raw biogas, to the burner of the furnace. An INDEPENDENT CLAIM is included for a system for producing hydrogen from biogas, comprising a raw biogas source, a unit for purifying a first part of biogas for producing biomethane, a reforming module, a shift module, a PSA module for producing hydrogen, a unit for recycling residue from the PSA to feed burner with secondary fuel, and a unit for supplying a primary fuel, which is obtained from a secondary part of non-purified or partially purified raw biogas, to the burner of the furnace.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a process for producing hydrogen from biogas (Drawing includes non-English language text).    Raw biogas (1)    First purification step (2)    Biomethane (5)    Reformer (6)    Syngas. (7)