C - Chemistry – Metallurgy – 10 – J
Patent
C - Chemistry, Metallurgy
10
J
48/32
C10J 3/00 (2006.01) C10L 3/08 (2006.01)
Patent
CA 1088311
ABSTRACT OF THE DISCLOSURE The present invention relates to a process of producing a natural gas substitute comprising at least about 80% of methane by volume by multi-stage methanation of a synthesis gas containing hydrogen and oxides of carbon over fixed-bed nickel-containing catalysts under a pressure of about 5 to 100 bars. The improvement thereof comprises employing a synthesis gas having a methane con- tent on a dry basis of about 8 to 25% by volume, effecting methanation in a first catalyst-containing stage wherein the gas has a temperature of about 230 to 400°C at the entrance to the catalyst therein and a temperature of about 550 to 750°C at the exit from the catalyst. The first stage comprises at least two adiabatically operating methanation reactors in sequence, each reactor being fed with part of the fresh synthesis gas, the first reactor being fed with a mixture of fresh synthesis gas and a re- cycled part of an effluent gas from one of the reactors. This part of the effluent gas is cooled and compressed, the catalyst in the reactors of the first stage by weight consisting essentially of about 25 - 50% of nickel, at least about 5% of high-alumina cement and at least about 5% of zirconium dioxide or titanium dioxide. From the last reactor of the first stage a high-methane effluent gas is withdrawn and then further methanation of the high- methane effluent gas is effected in a second catalyst-con- taining stage at a temperature of about 230 to 500°C, thereby to produce the desired natural gas substitute.
305039
Jockel Heinz
Moller Friedrich-Wilhelm
Muller Wolf-Dieter
Metallgesellschaft Aktiengesellschaft
Robic Robic & Associes/associates
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