Group iii base stocks and lubricant compositions

A Group III base stock comprising:

• at least 90 wt. % saturated hydrocarbons;
• kinematic viscosity at 100° C. of 5.0 cSt to 12.0 cSt;
• a viscosity index of 120 to 140;
• a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.59;
• and
• a ratio of branched carbons to straight chain carbons (BC/SC) less than or equal to 0.216.

A method for producing a diesel fuel and an API Group III base stock, comprising:

• providing a feed stock comprising a vacuum gas oil feed;
• hydrotreating the feed stock under first effective hydrotreating conditions to produce a first hydrotreated effluent;
• hydrotreating the first hydrotreated effluent under second effective hydrotreating conditions to produce a second hydrotreated effluent;
• fractionating the second hydrotreated effluent to produce at least a first diesel product fraction and a bottoms fraction;
• hydrocracking the bottoms fraction under effective hydrocracking conditions to produce a hydrocracked effluent;
• dewaxing the hydrocracked effluent under effective catalytic dewaxing conditions to produce a dewaxed effluent, the dewaxing catalyst including at least one non-dealuminated, unidimensional, 10-member ring pore zeolite, and at least one Group VI metal, Group VIII metal or combination thereof;
• hydrotreating the dewaxed effluent under third effective hydrotreating conditions to produce a third hydrotreated effluent;
• and
• fractionating the third hydrotreated effluent to form at least a second diesel product fraction and a base stock product fraction, wherein the Group III lubricant base stock product fraction includes greater than or equal to 90 wt. % saturated hydrocarbons, a kinematic viscosity at 100° C. between 4 cSt and 5 cSt and has a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than about 0.52, and a ratio of branched carbons to straight chain (BC/SC) carbons less than or equal to 0.21.

A method for producing a diesel fuel and a base stock, comprising:

• providing a feed stock comprising a vacuum gas oil feed;
• hydrotreating the feed stock under first effective hydrotreating conditions to produce a first hydrotreated effluent;
• hydrotreating the first hydrotreated effluent under second effective hydrotreating conditions to produce a second hydrotreated effluent;
• fractionating the second hydrotreated effluent to produce at least a first diesel product fraction and a bottoms fraction;
• hydrocracking the bottoms fraction under effective hydrocracking conditions to produce a hydrocracked effluent;
• dewaxing the hydrocracked effluent under effective catalytic dewaxing conditions to produce a dewaxed effluent, the dewaxing catalyst including at least one non-dealuminated, unidimensional, 10-member ring pore zeolite, and at least one Group VI metal, Group VIII metal or combination thereof;
• hydrotreating the dewaxed effluent under third effective hydrotreating conditions to produce a third hydrotreated effluent;
• and
• fractionating the third hydrotreated effluent to form at least a second diesel product fraction and a base stock product fraction, wherein the Group III lubricant base stock product fraction includes greater than or equal to 95 wt. % saturated hydrocarbons, a kinematic viscosity at 100° C. between 5 cSt and 12 cSt and has a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than about 0.59, and a ratio of branched carbons to straight chain (BC/SC) carbons less than or equal to 0.26.