| 摘要 |
<p>A process is described for increasing the hydrogen content of a synthesis gas containing one or more sulphur compounds, said synthesis gas comprising hydrogen, carbon oxides and steam, and having a ratio, R, defined as R = (Hz-COz)/(CO+COz) < 0.6 and a steam to carbon monoxide ratio 5 1.8, comprising the steps of (i) heating the synthesis gas (110), (ii) subjecting at least a portion of the heated synthesis gas to a first stage of water-gas shift in a first shift vessel (128) containing a first sulphur-tolerant water-gas shift catalyst that is cooled in heat exchange with boiling water (138), to form a pre-shifted gas stream, and (iii) forming a shifted gas stream by subjecting at least a portion of the pre-shifted gas stream to a second stage of water-gas shift in a second shift vessel (114) containing a second sulphur-tolerant water-gas shift catalyst that is cooled in heat exchange with a gas stream comprising the synthesis gas.</p> |
