Process for increasing hydrogen content of synthesis gas
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United States of America Patent
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Dec 8, 2015
Grant Date -
Sep 18, 2014
app pub date -
Oct 10, 2012
filing date -
Nov 18, 2011
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Abstract
Process for increasing the hydrogen content of a synthesis gas containing one or more sulphur compounds, the synthesis gas including hydrogen, carbon oxides and steam, and having a ratio defined as R═(H2—C02)/(CO+C02)≦0.6 and a steam to carbon monoxide ratio ≦1.8, includes the steps of (i) adjusting the temperature of the synthesis gas; (ii) passing at least a portion of the heated synthesis gas adiabatically through a first bed of sulphur-tolerant water-gas shift catalyst disposed in a first shift vessel at a space velocity ≧12,500 hour−1 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 containing a second bed of sulphur-tolerant water-gas shift catalyst that is cooled in heat exchange with a gas stream including the synthesis gas.
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