Re-Refining Process Overview

Lube base oils are the most valuable constituents in crude oil. Virgin lube oils are recovered from so-called lube crudes by solvent extraction followed by wax (i.e. paraffin) removal. To enhance color and stability, the raw lube is catalytically hydrotreated. Average crude oils have 3-8% lube content, whereas lube crudes typically have 12-16% lube content. This compares with 60-75% recoverable lube content in spent automotive oils, which if burned or dumped would mean the loss of a valuable natural resource.

PROCESS OVERVIEW - Used lube oil, collected by our specialized trucks and technicians from garages, car dealers, service stations, etc., is brought to the re-refining plant. The used oil is then processed to yield lube base stocks, fuel oil and asphalt flux.

The proprietary EVERGREEN-CEP Re-Refining Process is a six step procedure consisting of:

  • Pre-Treatment
  • Water and Light Fraction Removal
  • Fuel Oil Fraction Removal
  • Separation of Lube by Distillation
  • Conversion of Lube Distillate through Hydrotreatment to Base Stock
  • Splitting of Base Stock into Desired Cuts through Fractionation

Simplified Process Flow Diagram