Method of low-molecular organic material

The steam gasification melting furnace with carbon dioxide and hydrogen containing off-gas produced (G0) formed by mixing a mixed gas (G), or, produce an exhaust gas (g1) to a gasification melting furnace containing carbon monoxide and hydrogen in the addition of excess water vapor shift reaction, formation of hydrogen-containing exhaust gas (g1) contained, generated by the shift reaction of carbon dioxide and hydrogen, steam and a mixed gas shift reaction is not consumed (g), so that the gas mixture (g) with an organic contacting the material, the organic material and molecular weight of the modified.