Hydrogen production method

A process for producing hydrogen from hydrocarbonaceous educts in which the starting material is autothermally gasified by non-catalytic partial oxidation in a first reaction stage by adding oxygen-containing gas and steam at a temperature of 1200 to 1500° C. and a pressure of 15 to 100 barabs to obtain a raw gas containing H2 and CO as main components as well as the components CO2, H2O, CH4 and traces of H2S, COS, CnHm, N2 and Ar, and the metal ashes contained in the raw gas are removed as molten slag together with the soot by means of quenching, and in a second reaction stage the CO contained in the raw gas is converted to CO2 and further H2 by adding steam, wherein the converted raw synthesis gas leaving the second reaction stage is separated into high-purity H2 and into a gas mixture containing 0.5 to 10 vol-% of H2S, 50 to 95 vol-% of CO2, 5 to 20 vol-% of H2, 0.1 to 10 vol-% of CO and 0.1 to 10 vol-% of CH4, Ar, N2 by a pressure-swing absorption process in a third stage, the gas mixture is supplied to a tail gas wash of a Claus process, H2S selectively separated from the gas mixture is introduced into the feed gas of the Claus process, and the desulfurized waste gas of the tail gas wash, mixed with the tail gas of the Claus process, is burnt.