Method of simultaneously manufacturing high quality naphthenic base oil and heavy base oil

A method of simultaneously manufacturing high quality naphthenic base oil and heavy base oil using a single catalyst system comprising a hydrotreating catalyst, a dewaxing catalyst and a hydrofinishing catalyst, the method comprising:

• (a) preparing the feedstock for naphthenic base oil by separating appropriately light cycle oil or slurry oil which is produced by subjecting atmospheric residue to fluid catalytic cracking;
• (b) preparing the feedstock for heavy base oil by separating appropriately the deasphalted oil which is produced by subjecting vacuum residue or a mixture comprising atmospheric residue and vacuum residue to solvent deasphalting;
• (c) sequentially or simultaneously hydrotreating the light cycle oil, the slurry oil or a mixture thereof separated in (a) and the deasphalted oil separated in (b) using the hydrotreating catalyst, thus obtaining a hydrotreated oil fraction;
• (d) catalytic dewaxing the hydrotreated oil fraction using the dewaxing catalyst, thus obtaining a dewaxed oil fraction;
• and
• (e) hydrofinishing the dewaxed oil fraction using the hydrofinishing catalyst, thus obtaining a hydrofinished oil fraction,
• wherein the slurry oil used in (c) is cut-slurry oil obtained by subjecting the slurry oil from FCC (fluid catalytic cracking) to vacuum distillation, or deasphalted slurry oil obtained by subjecting the slurry oil separated by fluid catalytic cracking to solvent deasphalting.