NOVELTY - Production of hydrogen involves separating sodium (108) from a first aqueous sodium hydroxide stream (104); and combining the sodium with water to produce hydrogen and a second aqueous sodium hydroxide stream.    USE - For production of hydrogen from sodium hydroxide and water(claimed).    ADVANTAGE - The method is environmentally benign and does not produce undesirable waste or byproducts. Assuming that little to no mineral oil is sent to the sodium reactor, the hydrogen generation system is essentially environmentally benign. Water is the only material consumed in the hydrogen generating system as the sodium hydroxide streams are combined and recycled through the system. Further, the only products of the overall hydrogen generation system are water, oxygen, and hydrogen. Additionally, the size of the system and the operation parameters associated with it, such as, flow rates, will depend on the quantity of hydrogen sought to be produced. As such, the size of the hydrogen generation system is easily scaled to meet demand requirements. The sodium ion separator may be used to produce elemental sodium, which may have additional industrial applications.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) system (S1) for producing hydrogen, comprising: a separator configured for separating sodium from a first aqueous sodium hydroxide stream; and a source of water coupled to a reactor, configured to receive the sodium from the separator and for reacting the water and the sodium for producing a second aqueous sodium hydroxide stream and hydrogen; and    (2) system (S2) for producing hydrogen, comprising: at least one electrolytic cell configured to convert aqueous sodium hydroxide into sodium and hydroxide; at least one energy power source coupled to the at least one electrolytic cell (130) to supply an electrical current to the at least one electrolytic cell; and at least one reactor configured to react sodium produced by the at least one electrolytic cell with water for producing hydrogen gas and aqueous sodium hydroxide.    DESCRIPTION OF DRAWING(S) - The figure shows schematic of an electrolytic cell.    Water (102)    First aqueous sodium hydroxide stream (104)    Oxygen (106)    Sodium (108)    Mineral oil (116)    Electrolytic cell (130)    Catholyte chamber (134)    Anolyte chamber (136)    Ceramic membrane (142)    Inlet (150)