DLPL previously re-refined Used Engine Oils by a simple procedure of settling followed by dehydration, Thin Film and Short Path Distillation. The fractioned base oils obtained from this process were treated with activated clay to yield light colored base oil fit for re-use in Lubricating Oils. The carbonaceous residue from this distillation process was a grave concern.
With itís focus on continuous improvement and striving to be the best in the industry, DLPL has been constantly researching new processes for the pre-treatment of Used Engine Oils.
Recently DLPL has indigenously developed a pre-treatment process that eliminates the carbon particles in the ULO at the very onset of the process, just after the dehydration process. The pre-treatment is a 2-stage chemical treatment involving easily available chemicals and carried out at a temperature ranging from 70 - 180 deg C.
The gravity separated product of this pre-treatment process is absolutely CARBON FREE and can be easily fractionated through the Agitated Thin Film Evaporator and finally through the Short Path Distillation Unit to separate the heavy base oil without fouling of the process equipment with coke. The residue obtained after the fractionation is a brown carbon-free viscous oil that can be sold as a lubricant for the heavier applications such as heavy gear lubricant / sugar mill compounds / open gear lubricant or any other application where a heavy viscous lubricant would be required.
The new process has improved the overall working of the plant, reduced frequent maintenance, carbon deposits, shut-downs and also improved the quality of the distilled fractions i.e. base oils.