NOVELTY - The apparatus comprises a separating element, an electron conducting material containing anode (2), an electron conducting material containing cathode, and a gas-tight, proton exchange membrane (4), where hydrogen content of a gas mixture is separated by supplying to a first space (anode region) in an enclosed outlet in which the anode is located and by sealing a second space (cathode region) in a cathode separated from the first region by the membrane. The anode is doped with a hydrogen oxidation catalyst, and the cathode is doped with a proton reduction catalyst.    USE - The apparatus is useful for separating hydrogen from gas mixtures (claimed), where the hydrogen is useful for fuel cell and a chemical industry.    ADVANTAGE - The apparatus efficiently and economically separates the hydrogen from the gas mixtures with less energy consumption and high purity.    DETAILED DESCRIPTION - The apparatus comprises a separating element, an electron conducting material containing anode (2), an electron conducting material containing cathode, and a gas-tight, proton exchange membrane (4), where hydrogen content of a gas mixture is separated by supplying to a first space (anode region) in an enclosed outlet in which the anode is located and by sealing a second space (cathode region) in a cathode separated from the first region by the membrane. The anode is doped with a hydrogen oxidation catalyst, and the cathode is doped with a proton reduction catalyst, where in the anode side, the hydrogen molecules and hydrogen atoms are catalytically decomposed into protons and electrons. The protons pass through the proton exchange membrane, and the electrons recombine with the molecular hydrogen on the cathode side. A high positive pressure difference is maintained between the anode and cathode regions so that a concentration cell produces, in the cathode, hydrogen, which is constantly exhausted and positive pressure differences are formed as a pressure resistant. A solid electrolyte membrane is provided at a high temperature of greater than or equal to 100 degrees C, and a polymer electrolyte membrane is provided at a low temperature of 100 degrees C. The polymer electrolyte membrane has a very low electrical resistance. A sulfonated polytetrafluoroethylene membrane is provided to maintain the passage of the protons, if the membrane is wetted by deionized water, where the membrane is Nafion(RTM: Sulfonated tetrafluoroethylene based fluoropolymer-copolymer) membrane. The membrane is continuously humidified by a unit of an operating device according to the principle of capillary action, in the same pressure conditions as prevail in the anode region. An efficiency of 99% or 95% in relation to the energy content of the separated hydrogen gas volume in relation to the energy expended for maintaining the pressure conditions is achieved using membrane of a regenerative fuel cell-103 at pressures of 0.8 or 0.55 bar in the anode region and -0.9 or -0.7 bar in the cathode region at a DC voltage of 0.1 volts at complete removal of hydrogen from a gas mixture. The positive pressure difference is formed by applying a low direct current (DC) voltage between anode and cathode.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a separator.    Anode (2)    Proton exchange membrane (4)    DC power source (7)    Compressor (12)    Suction apparatus. (11)