... oil is of good viscosity, good color, odor, and high lubricating properties. There are non-hydrocarbon, alkene, polycyclic aromatic hydrocarbon, ... and the oil appear as dark color and depositing.Our company developed a kind of alkalic composite catalyst, in the ... .02Tag:oil refining equipment, oil refinery plant, vacuum distillation unit DIR Oil refining equipment, oil refinery plant, atmospheric and ...