The Hydrogen adding Tail Oil contains the paraffin hydrocarbons and alicyclic hydrocarbons more then 96.8 percent, and contains the aromatic hydrogen less then one percent.

• 催化油浆和重催油浆中含芳香烃最多，达42%25？66%25，饱和烃和环烷烃含量最少，在23%25？