Method of manufacturing high quality lube base oil using unconverted oil

摘要

Disclosed is a method of manufacturing high quality lube base oil (Group III) from unconverted oil having various properties obtained in a variety of hydrocrackers using improved catalytic dewaxing and hydrofinishing, the method including producing unconverted oil of at least one kind in the same or different hydrocrackers; subjecting the unconverted oil to vacuum distillation; supplying all or part of the distillate fractions to a catalytic dewaxing reactor; supplying the dewaxed oil fraction to a hydrofinishing reactor; and stripping the hydrofinished light oil fraction, wherein make-up hydrogen is supplied upstream of the hydrofinishing reactor to increase hydrogen partial pressure, thereby enabling high quality base oil to be manufactured at high yield under optimal process conditions using unconverted oil produced by hydrocracking under various conditions.

主权项

1. A method of manufacturing high quality lube base oil, comprising:
producing unconverted oil of at least one kind in same or different hydrocrackers; supplying the unconverted oil to a vacuum distillation separator to separate, one or more distillate fractions therefrom, the unconverted oil being a mixture comprising
unconverted oil A having a viscosity index (VI) of 100-140, 20-100 ppm sulfur and 3-50ppm nitrogen andunconverted oil B having a viscosity index of 115-155, 5-50 ppm sulfur and 0.1-5 ppm nitrogen, anda weight ratio of unconverted oil A and unconverted oil B of the mixture being 1(A):1-2 (B); supplying all or part of the distillate fractions to a dewaxing reactor in the presence of an isomerization catalyst to obtain a dewaxed oil fraction; and supplying the dewaxed oil fraction to a hydrofinishing reactor in the presence of a hydrofinishing catalyst to obtain a hydrofinished oil fraction, wherein make-up hydrogen is supplied upstream of the hydrofinishing reactor and downstream of the dewaxing reactor in order to increase hydrogen partial pressure in the hydrofinishing reactor and to lower a reaction temperature of hydrofinishing, and wherein the lube base oil is Group III base oil.