C - Chemistry – Metallurgy – 10 – K
Patent
C - Chemistry, Metallurgy
10
K
260/710
C10K 3/04 (2006.01) C07C 1/00 (2006.01)
Patent
CA 1138477
12620 METHANATION OF CARBON MONOXIDE WITH IMPROVED CATALYST REGENERATION ABSTRACT OF THE DISCLOSURE Carbon monoxide-containing gas streams are passed over a catalyst capable of catalyzing the disproportiona- tion of carbon monoxide so as to deposit a surface layer of active surface carbon on the catalyst essentially without formation of inactive coke thereon. The surface layer is contacted with steam and is thus converted to methane and CO2, from which a relatively pure methane product may be obtained. Dilute carbon monoxide-containing streams, as from underground coal gasification with air or the effluent from blast furnace operations, can be used without pre- treatment to convert the carbon monoxide and/or to separate inert gases therefrom. Conversion of the active surface csrbon with high pressure steam enables a high pressure product methane stream to be generated without expensive compression equipment and high energy consumption. Nickel, cobalt, iron, ruthenium, rhenium and alloys thereof are preferred catalysts, with the surface area thereof being preferably at least about 10m2/gr. Conversion of the active surface carbon can also be accomplished by contact with hydrogen. Carbon monoxide-containing gas streams having hydrogen or water present therein can be used, with only the carbon monoxide available after reaction with said hydrogen or water being decomposed to form said active surface carbon. The hydrogen or water will be converted, partially or completely, to methane which can be utilized in a combustion zone to generate heat for steam production 12620 or other energy recovery purposes. For practical commercial operations utilizing the two-step process of the invention on a cyclic basis, nickel, cobalt, ruthenium, thenium and alloys thereof are especially prepared for use in a metal state, with CO disproportionation being carried out at temperatures up to about 350°C and with the conversion of active surface carbon to methane being carried out by reaction with steam. The catalyst is employed in such cyclic operations without the necessity for employing a regeneration step as part of each processing cycle. Inactive carbon or coke that tends to form on the catalyst over the course of continuous operations utilizing such cyclic process is effectively and advantageously removed, on a periodic basis, in place of conventional burn off with an inert stream containing a low concentration of oxygen. S P E C I F I C A T I 0 N -2-
361897
Frost Albert C.
Risch Alan P.
Hopley William G.
Union Carbide Corporation
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