NOVELTY - Process for producing hydrogen (H2) gas comprises: (a) combusting sulfur (S) or hydrogen sulfide (H2S) with oxygen to obtain sulfur dioxide (SO2) and water (H2O), plus heat; (b) adding water to the product of (a) to obtain a sulfurous acid solution (H2SO3 and H2O); (c) applying electrical current to the H2SO3 solution of (b) to obtain sulfuric acid (H2SO4) and H2 gas; and (d) using gas-liquid separation to separate the H2SO4 from the H2 gas to obtain separated components of the H2SO4 and the H2 gas.    USE - The process is useful to produce H2 gas and sulfuric acid, where the H2 gas is useful in the hydrogenation processes and transported and/or packaged for sale and for developing fuel processes, and the sulfuric acid is useful in e.g. a chemical processes.    ADVANTAGE - The process provides hydrogen gas while reducing any co-production of carbon dioxide and other by-products that are difficult to dispose in an environmentally effective manner, hence the process is economic.    DETAILED DESCRIPTION - Process for producing hydrogen (H2) gas comprises: (a) combusting sulfur (S) or hydrogen sulfide (H2S) with oxygen to obtain sulfur dioxide (SO2) and water (H2O), plus heat; (b) adding H2O to the product of (a) to obtain a sulfurous acid solution (H2SO3 and H2O); (c) applying electrical current to the H2SO3 solution of (b) to obtain sulfuric acid (H2SO4) and H2 gas; and (d) using gas-liquid separation to separate the H2SO4 from the H2 gas to obtain separated components of the H2SO4 and the H2 gas, where the heat generated in (a) is used to generate at least a portion of the electricity for the electrical current of (c). An INDEPENDENT CLAIM is included for a system for producing hydrogen gas comprising: an acid gas stream containing H2S; an air stream; a burner (20) configured to burn the acid gas stream and air stream and produce a product stream having at least SO2, H2O and heat; a boiler unit (21) operatively connected to the product stream of the burner (20) and configured to capture heat from the burner (20), and generate at least a steam stream and an exhaust gas stream having at least SO2; an SO2 separation unit operatively connected to the exhaust gas stream of the boiler unit and configured to remove SO2 from the exhaust gas stream and generate an SO2 exit stream; and an electrolytic cell (23) operatively connected to the SO2 exit stream and configured to produce H2 gas.    DESCRIPTION OF DRAWING(S) - The figure shows a process for converting hydrogen sulfide and/or elemental sulfur into hydrogen and sulfuric acid.    Burner (20)    Boiler unit (21)    Electrolytic cell (23)    Electrical generator (24)    Condensing unit. (25)