Desulfurization techniques

A method of reducing a sulfur content in a fuel, the method comprising:

• receiving a fuel into a desulfurization system that comprises an oxidation process unit, a liquid-liquid extraction unit and a pumping system that comprises a plurality of pumps each of which are fluidly cooperative with a respective one of each of a plurality of cascaded liquid-liquid extraction stages that define the liquid-liquid extraction unit;
• and
• upon operation of the fuel desulfurization system, (i) increasing the polarity of sulfur molecules that are contained within the fuel that has been received into the oxidation process unit by conveying the fuel therethrough, and (ii) transferring at least a portion of the increased polarity fuel molecules with an extraction fluid through fluid cooperation between the liquid-liquid extraction unit and the pumping system such that the pumping system provides substantially equal flow rates across each of the cascaded liquid-liquid extraction stages within the liquid-liquid extraction unit and further such that output from each one of the plurality of the cascaded liquid-liquid extraction stages comprises a first output containing reduced sulfur fuel and a second output containing an increased sulfur residual.