In a process for producing hydrocarbonaceous educts, the starting material is autothermally gasified by non-catalytic partial oxidation by adding oxygen-containing gas and hydrogen at temperatures of 1200 to 1500° C. and pressures 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 subsequently the CO contained in the raw gas is converted to CO2 and further H2 by adding steam. An improvement of the process consists in that in a pressure-swing absorption process the converted raw synthesis gas is separated directly, i.e. without passing through a wash for removing CO2 and H2S, into high-purity H2 and into a gas mixture containing H2S, CO2, H2, CO, CH4, Ar and N2, the gas mixture is supplied to the tail gas wash of a Claus process, the H2S separated is introduced into the feed gas of the Claus process, and the waste gas of the tail gas wash, mixed with the tail gas of the Claus process, is burnt.