Carbon monoxide removal from a reformate gas
AssigneeJohnson Matthey Public Limited Company
InventorArjan Nicolaas Johan Van Keulen
Life of this patent
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Abstract
A process for removing carbon dioxide from a gas stream containing hydrogen, carbon monoxide and carbon dioxide comprising subjecting the gas stream to a first stage high-temperature selective catalytic methanation to lower the carbon monoxide concentration in the gas but not below a concentration which allows carbon dioxide methanation to take place, followed by a second stage low selective catalytic methanation to lower the residual carbon monoxide in the gas stream to a concentration of below 40 ppm. The high temperature methanation is suitably carried out at a temperature of between 250° C. and 350° C., and the low temperature methanation is suitably carried out at a temperature below 270° C.
Claims15
A process for removing carbon monoxide from a gas stream containing hydrogen, carbon monoxide and carbon dioxide which comprises subjecting the gas stream to a first stage selective catalytic methanation at a first higher temperature and continuing said first stage methanation until the carbon monoxide concentration in the gas stream is reduced to a concentration of 0.1-1 vol %, in order to prevent carbon dioxide methanation taking place, followed by a second stage selective catalytic methanation conducted at a second lower temperature at which the residual carbon monoxide concentration in the gas stream is lowered to below 40 ppm with no carbon dioxide methanation taking place.
Dependencies are inferred from the claim text.