NOVELTY - High concentration hydrogen and high carbon monoxide concentration synthesis gas is manufactured by absorbing carbon dioxide using carbon dioxide absorber (1) from reformed gas obtained by carrying out steam reforming of hydrocarbon compound, producing high concentration hydrogen gas by transformation reaction by carbon monoxide and water vapor in gas, and producing high carbon monoxide concentration synthesis gas with high carbon monoxide concentration by reaction with synthesis gas.    USE - Manufacture of high concentration hydrogen and high carbon monoxide concentration synthesis gas for Fischer-Tropsch synthesis, methanol synthesis, liquid-fuel synthesis, and dimethyl ether synthesis.    ADVANTAGE - The method effectively uses carbon dioxide as secondary product, and removes high concentration hydrogen gas.    DETAILED DESCRIPTION - High concentration hydrogen and high carbon monoxide concentration synthesis gas is manufactured by absorbing carbon dioxide using carbon dioxide absorber (1) from reformed gas obtained by carrying out steam reforming of hydrocarbon compound, producing high concentration hydrogen gas by transformation reaction by carbon monoxide and water vapor in gas, circulating synthesis gas obtained by partially oxidizing synthesis gas or hydrocarbon compound obtained by carrying out steam reforming of hydrocarbon compound to carbon dioxide absorber, discharging carbon dioxide from the carbon dioxide absorber, and producing high carbon monoxide concentration synthesis gas with high carbon monoxide concentration by reaction with synthesis gas. An INDEPENDENT CLAIM is included for high concentration hydrogen and high carbon monoxide concentration synthesis gas production apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of high concentration hydrogen and high carbon monoxide concentration synthesis gas production apparatus.    Carbon-dioxide absorber (1)    Reaction tube (3)    Gas introduction path (5)    Modifier (7)    Flow-path switching valve (11)