Patent ID: 7513919

Claim:
An apparatus for catalytically reacting a feed, comprising: a channel adapted to receive a first heat transfer medium; two or more reaction zones at least partially disposed within the channel, wherein the reaction zones each comprise two or more tubes disposed therein containing at least one catalyst; a first conversion zone for shift-converting carbon monoxide to carbon dioxide, the first conversion zone at least partially disposed within the channel; a second conversion zone for shift-converting carbon monoxide to carbon dioxide, the second conversion zone at least partially disposed within the channel and operated at a temperature greater than the first conversion zone; a third conversion zone for converting carbon oxides to methane, the third conversion zone at least partially disposed within the channel; two or more pre-heat zones at least partially disposed within the channel; and two or more heat removal zones at least partially disposed within the channel, wherein the reaction zones and heat removal zones are successively disposed within the channel.