NOVELTY - The method comprises supplying a first electrochemical cell (EC1), a second electrochemical cell (EC2), and a third electrochemical cell (EC3) all connected in series, dividing the feedstream into three fractions, introducing a first fraction of the feedstream into the first electrochemical cell along with an effective amount of water and an oxygen resulting in the generation of elemental sulfur and a alkali metal hydroxide and generating a first electrical potential across the first electrochemical cell, and removing the elemental sulfur and the alkali metal hydroxide from the first cell.    USE - The process is useful for recovering sulfur and generating hydrogen from a feedstream and for desulfurizing a sulfur-containing heavy-oil feedstock (claimed).    ADVANTAGE - The process ensures easy removal of sulfur thus economically and efficiently desulfurizing a sulfur-containing heavy-oil feedstock with less consumption of hydrogen and without additional equipment.    DETAILED DESCRIPTION - The method comprises supplying a first electrochemical cell (EC1), a second electrochemical cell (EC2), and a third electrochemical cell (EC3) all connected in series, dividing the feedstream into three fractions, introducing a first fraction of the feedstream into the first electrochemical cell along with an effective amount of water and an oxygen resulting in the generation of elemental sulfur and a alkali metal hydroxide and generating a first electrical potential across the first electrochemical cell, removing the elemental sulfur and the alkali metal hydroxide from the first cell, passing electrons from an anode (A) of the first electrochemical cell to a cathode (C) of the second electrochemical cell to generate a second electrical potential across the second electrochemical cell, introducing a second fraction and a third fraction of the feedstream to the second electrochemical cell and the third electrochemical cell along with an effective amount of water resulting in the generation of elemental sulfur, a alkali metal hydroxide, and hydrogen respectively, removing the elemental sulfur and the alkali metal hydroxide and hydrogen from the second electrochemical cell and third electrochemical cell, passing electrons from the anode of the second electrochemical cell to the cathode of the third electrochemical cell to generate a third electrical potential across the third electrochemical cell, and passing electrons from the anode of the third electrochemical cell to the cathode of the first electrochemical cell. An electrical circuit around all of the electrochemical cells is completed with the first electrochemical cell. The first electrical potential generated is 0.5-5 volts. The three fractions are equal fractions. The three electrochemical cells are divided cells comprised of a cation permeable membrane (PM), which is comprised of hydrocarbon and perhalocarbon polymers. An INDEPENDENT CLAIM is included for a process for desulfurizing a sulfur-containing heavy-oil feedstock.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a system comprised of electrochemical cells.    Anode (A)    Cathode (C)    First electrochemical cell (EC1)    Second electrochemical cell (EC2)    Third electrochemical cell (EC3)    Cation permeable membrane. (PM)