Patent ID: 6569313
Filing Date: 2003-05-27
Classification: C10G

Abstract:
A process for producing lubricating oils from a lubricating oil feedstock comprising the steps of:(a) passing the feedstock to a hydrotreating zone and hydrotreating the feedstock under hydrotreating conditions to produce a hydrotreated feedstock, (b) passing the hydrotreated feedstock without disengagement to a hydrocracking zone and hydrocracking the hydrotreated feedstock under hydrocracking conditions to produce a hydrocracked feedstock, wherein at least about 30 wt. % of the feedstock is converted to hydrocarbon products which boil below the initial boiling point of the feedstock, (c) passing at least a portion of the hydrocracked feedstock to a separation zone and separating gases, a converted hydrocracked fraction containing distillates boiling up to the diesel range, and an unconverted hydrocracked fraction, (d) passing at least a portion of the unconverted hydrocracked fraction to a vacuum distillation zone and isolating at least two fractions, (e) passing at least one vacuum distillate fraction to a solvent extraction zone and extracting the at least one vacuum distillate fraction under solvent extraction conditions to produce a raffinate, (f) solvent dewaxing the raffinate from the solvent extraction zone in a solvent dewaxing zone under solvent dewaxing conditions to produce at least one solvent dewaxed fraction, and (g) hydrofinishing the at least one solvent dewaxed fraction in a hydrofinishing zone under hydrofinishing conditions, said hydrofinishing zone including a catalyst having metal hydrogenation function, to produce lubricating oils.