NOVELTY - Catalytic dehydrogenation of saturated hydrocarbons into unsaturated hydrocarbons and hydrogen, comprises synthesizing unsaturated hydrocarbons during which a first gas flow of inlet comprising saturated hydrocarbons is introduced into a catalytic chamber containing a porous catalyst bed having a catalyst for dehydrogenation of saturated hydrocarbons into unsaturated hydrocarbons and hydrogen.    USE - The process is useful for the catalytic dehydrogenation of saturated hydrocarbons into unsaturated hydrocarbons and hydrogen.    ADVANTAGE - The process: is implemented in an industrial scale, simple, inexpensive; and provides hydrogen with high purity.    DETAILED DESCRIPTION - Process for catalytic dehydrogenation of saturated hydrocarbons into unsaturated hydrocarbons and hydrogen, comprises at least one step of synthesizing unsaturated hydrocarbons during which a first gas flow of inlet comprising saturated hydrocarbons is introduced into a catalytic chamber containing a porous catalyst bed comprising a catalyst for dehydrogenation of saturated hydrocarbons into unsaturated hydrocarbons and hydrogen, where: the first gas stream crossing the catalytic bed and withdrawing from the catalytic chamber comprises a second gas flow in outlet comprising unsaturated hydrocarbons, saturated hydrocarbons unreacted under light products; hydrogen obtained from the dehydrogenation of saturated hydrocarbons, diffuses in electron and proton mixed conducting porous anode adjacent to the catalytic chamber, where the hydrogen is dissociated into protons and electrons; the protons obtained from the dissociation of hydrogen in the porous anode diffuse in the action of applied potential difference, in a dense conductive membrane purely proton adjacent to the anode, then in electron and proton mixed conducting porous cathode adjacent to the membrane, in which the protons are recombined into pure hydrogen; pure hydrogen formed in the cathode is collected in a cathode chamber adjacent to the cathode and separated from the catalyst chamber; pure hydrogen collected in the cathode chamber is continuously extracted; and a pressure partially regulated by hydrogen is maintained in the cathode chamber. INDEPENDENT CLAIMS are included for:    (1) a device for catalytic dehydrogenation of saturated hydrocarbons into unsaturated hydrocarbons and hydrogen, comprising: a catalytic chamber (201) containing a porous catalyst bed comprising a catalyst for dehydrogenation of saturated hydrocarbons into unsaturated hydrocarbons and hydrogen; means for introducing a first gas stream (211) comprising hydrocarbons saturated in the catalytic chamber to cross at least partly the catalyst bed by the first gas stream, and means for withdrawing a second gas stream comprising unsaturated hydrocarbons, unreacted saturated hydrocarbons and light by-products, from the catalytic chamber; electrons and protons (202) mixed conducting porous anode adjacent to the catalytic chamber; purely proton dense conductive membrane (203) adjacent to the anode; electrons and protons mixed conducting porous cathode adjacent to the membrane; means to impose a difference in potential between the anode and cathode; a cathode chamber (205) adjacent to the cathode, separated by the catalytic chamber, and capable of collecting hydrogen; and means for extracting hydrogen continuously out of the cathode chamber and maintaining a controlled pressure of hydrogen in the chamber; and    (2) an installation of catalytic dehydrogenation of saturated hydrocarbons into unsaturated hydrocarbons and hydrogen, comprising the device, means for treating the outlet gas stream, and separating it into a stream mainly comprising unsaturated hydrocarbons, optionally into a stream mainly comprising unreacted saturated hydrocarbons, and a stream comprising light by-products, and optionally means for recycling the stream mainly comprising unreacted saturated hydrocarbons in the inlet gas stream.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the vertical section of the device for implementing the process for catalytic dehydrogenation of saturated hydrocarbons into unsaturated hydrocarbons and hydrogen.    Catalytic chamber (201)    Electrons and protons (202)    Proton dense conductive membrane (203)    Cathode chamber (205)    First gas stream. (211)