Process for the co-production of superheated steam and methane

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(57) Abstract : A process for the co-production of superheated steam and methane composing reacting a gas containing carbon monoxide and hydrogen in a seTtes of methanation regions to produce a product gas containing methane, wherein the gas contain- lng carbon monoxide and hydrogen flows, in passing through the sees of methanation regions, successively through at least a first internally cooled methanation region, cooling the first and second internally cooled methanation region with water, which water is vaporized in the first internally cooled methanation region to produce steam and which steam is subsequently superheated in the second internally cooled methanation region to produce superheated steam, wherein the internally cooled methanation re- a a