PROCESS FOR THE PREPARATION OF SYNTHESIS GAS

摘要

Process for the production of synthesis gas by catalytic steam reforming of a hydrocarbon containing feedstock in parallel in an autothermal steam reformer and in one or more steam reformers in series, the heat for the steam re- forming reactions in the one or more steam reformers being provided by indirect heat exchange with the combined efflu- ents from the one or more steam reformers with the auto- thermal steam reformer, and wherein carbon monoxide con- taining gas is added to the feedstock prior to the steam reforming in the autothermal steam reformer and/or prior to the steam reforming in the one or more steam reformers, the carbon monoxide containing gas having a molar ratio of hy- drogen to carbon of less than 4.5 and being added in an amount resulting in a product stream having a molar ratio of hydrogen to carbon monoxide of between about 1.8 and 2.3.