Importance

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Abstract

The invention relates to a process and to a plant for producing methanol from a synthesis gas having a hydrogen deficit. A fresh gas stream from a reformer unit which includes hydrogen and carbon oxides is combined with a hydrogen-containing stream from a hydrogen recovery stage. This affords a synthesis gas stream having a stoichiometry number SN, defined as SN=[n(H₂)−n(CO₂)]/[n(CO)+n(CO₂)], of less than 2.0. The synthesis gas stream is combined with a residual gas stream and the synthesis gas stream and the residual gas stream are passed through a bed of a methanol synthesis catalyst at elevated pressure and elevated temperature to obtain a product stream having methanol and the residual gas stream, and the product stream is cooled to separate methanol from the residual gas stream.

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First Claim