from a group consisting of but not limited to metal fibers glass fibers polymer fibers graphite fibers and carbon fibers to meet two criteria 1 the fiber material must be wettable by one of the two immiscible liquids preferably the aqueous phase and 2 the fibers must be of a material that will not contaminate the process or be destroyed by it such as by corrosion during the operation of vessel 10 two layers form in the bottom section 12 a lower layer 13 comprising aqueous solution and an upper layer 14 comprising separated sulfur free or low sulfur diesel fuel the shroud and the fiber bundle extend out partly from the confines of shroud 7 with the positioning of the downstream end of the fiber bundle is within lower layer 13 the cleaned oxidized diesel fuel i e substantially sulfur free in upper layer 14 is removed from vessel 10 via line 5 and sent to storage or for further processing by substantially sulfur free we mean the diesel fuel has a sulfur level of lt 50 ppm total sulfur preferably lt 20 ppm total sulfur and more preferably lt 10 ppm total sulfur the aqueous solution is removed as a separate stream via line 6 with.