Patent ID: 8585889
Filing Date: 2013-11-19
Classification: C10G

Abstract:
1. A method of manufacturing a naphthenic base oil from a hydrocarbon feedstock having a boiling point higher than that of gasoline and containing heteroatom species and an aromatic material, comprising: (a) separating a light cycle oil and a slurry oil from oil fractions obtained through fluidized catalytic cracking; (b) separating the slurry oil separated in step (a) into a deasphalted oil and a pitch through solvent deasphalting; (c) hydrotreating the light cycle oil separated in step (a), the deasphalted oil separated in step (b), or a mixture thereof, using a hydrotreating catalyst to produce a hydrotreated oil fraction having a reduced amount of heteroatom species; (d) dewaxing the entire hydrotreated oil fraction, obtained, in step (c), using is dewaxing catalyst to produce a dewaxed oil fraction having a lowered pour point, the dewaxing catalyst comprising a support selected from the group consisting of molecular sieve, alumina and silica-alumina, and a combination of (i) Ni or Co,and (ii) Mo or W as a hydrogenation metal component; (e) hydrofinishing the dewaxed oil fraction, obtained in step (d), using a hydrofinishing catalyst to produce a hydrofinished oil fraction with the aromatic content thereof adjusted to comply with a product standard; and (f) separating the hydrofinished oil fraction, obtained in step (e), according to a range of viscosity, wherein steps (a) through (f) are carried out successively such that no hydroprocessig steps are conducted between the hydrotreating step (c) and the dewaxing step (d), wherein the light cycle oil separated in step (a), the deasphalted oil separated in step (b), or the mixture thereof has an aromatic content of 60 wt% or more, wherein the hydrotreated oil fraction in step (c) has a sulfur content of less than 200 ppm, a nitrogen content of less than 100 ppm, an aromatic content of less than 60 wt% and a poly-aromatic content of not more than 5%, and wherein the naphthenic base oil has a viscosity index of 85 or less, in which at least 30% of the carbon bonds thereof are of a naphthenic type according to ASTM D-2140, and has a naphthene content of 40 wt% or more.