GB1400065A - Process for the production of hydrogenrich gas from carbon monoxide and hydrogen-containing gases - Google Patents

Abstract

1400065 Hydrogen-rich gas SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ NV 7 Aug 1972 36809/72 Heading C5E A hydrogen-rich gas is produced by subjecting carbon monoxide and hydrogen-containing gases and steam to catalytic co-shift conversion in at least two stages in series with intermediate cooling between the stages, part of the gases by-passing the first stage(s) in the series and passing directly to the subsequent stage(s). The conversion may be carried out in at least three stages in series, at least the first two stages operating at high temperature, e.g. 325‹ to 600‹ C., and the last stage operating at low temperature, e.g. 175‹ to 325‹ C., part, e.g. 10 to 90% by volume, of the gases by-passing the first stage(s) and passing directly to the subsequent high temperature stage(s). Elevated pressures may be used. All the steam may be introduced into the first stage. Intermediate cooling between stages may be carried out by heat exchangers and/or boilers, or by water injection. The gases may contain more than 10% by volume carbon monoxide and may be obtained by the partial combustion of carbonaceous material. The percentage of carbon monoxide in the gases entering the low temperature stage is less than 5% by volume on a dry gas basis and less than 2% in the hydrogenrich synthesis gas leaving that stage. The shift catalysts may be metals of Groups VIb, VIIb and VIII or oxides or sulphides thereof and various carriers are named.