NOVELTY - The method comprises providing a molten pool within a reactor, where the molten pool comprises sodium carbonate, introducing an oxidizing material into the molten pool, introducing a carbon containing material into the molten pool, and reacting the oxidizing material, the carbon containing material and the molten pool at a temperature of greater than or equal to 930 degrees C and a pressure of greater than or equal to 13.9 MPa to produce an output stream that includes a vapor comprising hydrogen, where the reaction process is expressed in a given specification.    USE - The method is useful for producing gas such as syngas and fuel gas including hydrogen and methane.    ADVANTAGE - The method is capable of energy efficiently and economically producing the gas without environmental pollution.    DETAILED DESCRIPTION - The method comprises providing a molten pool within a reactor, where the molten pool comprises sodium carbonate, introducing an oxidizing material into the molten pool, introducing a carbon containing material into the molten pool, and reacting the oxidizing material, the carbon containing material and the molten pool at a temperature of greater than or equal to 930 degrees C and a pressure of greater than or equal to 13.9 MPa to produce an output stream that includes a vapor comprising hydrogen, where the reaction process is expressed in a given specification. The step of introducing the carbon containing material into the molten pool includes introducing vacuum residuum into the molten pool. The step of introducing the oxidizing material into the molten pool includes introducing softened water into the molten pool. The method further comprises mixing the softened water and the vacuum residuum before introducing into a melt, extracting water from the output stream, recycling the water back to the molten pool within the reactor, heating the softened water to produce steam before introducing the water into the molten pool, retaining liquids within the reactor, producing a gas stream as the output stream comprising methane gas and carbon dioxide gas in addition to the hydrogen, separating any entrained solids from the gas stream, separating the hydrogen gas and methane gas from the carbon dioxide and any additional gasses, and dissolving any soluble separated solids and returning them back to the molten pool.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a system for producing gas.    Conditioning, storing and recycling water (200)    Introducing process water (250)    Introducing hydrocarbon (350)    Separating product phase (600)    Extracting product solids. (700)