Water gas shift reaction process

摘要

A process is described for increasing the hydrogen content of a synthesis gas comprising hydrogen and carbon oxides and having a carbon monoxide content ≥45 mole% on a dry-gas basis, comprising the steps of: (i) combining the synthesis gas with steam to form a steam-enriched feed gas mixture (ii) passing the feed gas mixture at an inlet temperature in the range 220-370°C over an iron-based water-gas shift catalyst to form a hydrogen-enriched shifted gas mixture having a carbon monoxide content ≤10 mole% on a dry gas basis, and (iii) recovering the hydrogen-enriched shifted gas mixture, wherein a portion of the hydrogen-enriched shifted gas mixture is recycled to the feed gas mixture.