An electrochemical reactor, including a flow guide; a membrane/electrode assembly; a peripheral seal; an intermediate seal encircled by the peripheral seal and encircling a reaction zone of the electrochemical reactor; a first flow circuit for cooling fluid arranged between the peripheral seal and the intermediate seal, including a first flow channel extending along the peripheral seal; a second flow channel extending along the intermediate seal; and a third flow channel connecting the respective second ends of the first and second flow channels, so that a fluid introduced at the level of the first manifold must pass through the third flow channel to return to the second manifold.
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