Feedstock is separated into distillates and vacuum gas oils.

Waxy vacuum gas oil molecules flow to the hydrocracker to begin conversion.

Hydrogen is introduced to saturate the molecules and remove impurities such as nitrogen, sulfur, oxygen and heavy metals.

Hydrocracking, under conditions of extreme temperature and pressure in the presence of a catalyst, converts aromatic molecules into saturated paraffins.

The altered stock is noticeably lighter in color due to the absence of contaminants.

Long waxy paraffin molecules are restructured into shorter, branched isoparaffins that resist gelling and improve low temperature pumpability.

Hydrogen is introduced again to remove any remaining aromatics and impurities, enhancing the oxidation and thermal stability of the now colorless.