WIPED  FILM EVAPORATION FOLLOWED BY SOLVENT EXTRACTION 

In this process, after the separation of water and fuel we use Wiped Film evaporator in order to separate remaining fuel and heavy ends during vacuum distillation.

afterwards, we use Solvent extraction to improve the quality of the base oil that is produced from a vacuum distillation process. The solvent is used to extract polar compounds, additives and color bodies. this process is called decolourisation; It removes aromatics and increases saturates level. One drawback to solvent extraction is that it removes the unsaturated compounds, reducing the overall yield. This is in contrast to hydro-treating which converts these compounds. Solvent extraction produces API Group I base oil that meets motor oil specifications but does not meet API Group II specifications due to its inability to remove sulfur.