Patent ID: 6187725
Filing Date: 2001-02-13
Classification: C10G,C10M,C10N

Abstract:
A lubricating composition prepared by the process comprising the steps of:(a) contacting a heavy mineral oil feed in a hydrocracking zone with a hydrocracking catalyst at hydrocracking conditions, whereby at least a portion of said heavy mineral oil feed is cracked;(b) recovering at least one gasoline-image fraction and one bottoms fraction from said hydrocracking zone;(c) passing a first portion of said bottoms fraction comprising not more than about 67 wt. % of said bottoms fraction to a dewaxing zone; and passing a second portion of said bottoms fraction comprising at least about 33 wt. % of said bottoms faction back to said feed hydrocracker for additional processing; and wherein said bottoms fraction has a viscosity at 100.degree. C. of less than about 4.0 cSt;(d) contacting said first portion of said bottoms fraction with a dewaxing catalyst under catalytic dewaxing conditions, wherein at least a portion thereof is substantially dewaxed;(e) contacting at least a portion of said substantially dewaxed bottoms fraction with a hydrofinishing catalyst under hydrofinishing conditions, thereby producing a hydrofinished, dewaxed bottoms fraction;(f) removing from said hydrofinished, dewaxed bottoms fraction at least one light fraction comprising diesel or jet fuel range material, thereby leaving a heavy fraction comprising a hydrocracker-derived, highly naphthenic, low viscosity index mineral oil having a naphthenes content of at least about 33 wt. %; and(g) mixing with said hydrocracker-derived, highly naphthenic, low viscosity index mineral oil:(1) a second mineral-oil selected from a high viscosity index mineral oil, a convention low viscosity index mineral oil, or mixtures thereof;(2) at least one polymethacrylate polymer; and(3) at least one performance additive package,thereby forming said lubricating composition wherein said lubricating composition comprises:(a) from about 10 wt. % to about 100 wt. % of said hydrocracker-derived, highly naphthenic, low viscosity index mineral oil, based on the -combined weight of said hydrocracker-derived, highly naphthenic, low viscosity index mineral oil and said second mineral oil;(b) from about 0 wt. % to about 90 wt. % of said second mineral oil, based on the combined weight of said hydrocracker-derived highly naphthenic, low viscosity index mineral oil and said second mineral oil;(c) from about 2 wt. % to about 14 wt. % of said polymethacrylate polymer, based on the total weight of said lubricating composition and(d) from about 2 wt. % to about 14 wt. % of said performance additive package, based on the total weight of said lubricating composition.