FIELD: chemistry.
SUBSTANCE: natural gas substitute is obtained from fresh crude synthesis gas 11 in a methanation section 10, having at least a first adiabatic reactor 101 and at least an additional adiabatic reactor 102-104, connected in series. A gas stream collected from the previous reactor of the methanation section is fed into each additional reactor 102-104, and at least a portion 22 of the reaction gas is recycled as input gas into at least one of said reactors. Fresh crude synthesis gas 11 is concurrently fed into reactors 101-104 and gas recycling is carried out by collecting a portion 22 of the reaction gas stream 20 from the first reactor 101 and the portion 22 of the gas is used as recycling gas to dilute the stream 12 of the fresh gas fed into the first reactor 101, to obtain a stream 18 of diluted gas at the input of the first reactor.
EFFECT: invention increases efficiency by reducing recycled gas consumption.
12 cl
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