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A process is provided for producing a heavy lubricating base oil by hydrocracking a lubricating oil feedstock at high yield. The lubricating oil feedstock contains a hydroprocessed stream that is difficult to process using a conventional catalyst system. The catalyst used in the process includes a m

A process is provided for producing a heavy lubricating base oil by hydrocracking a lubricating oil feedstock at high yield. The lubricating oil feedstock contains a hydroprocessed stream that is difficult to process using a conventional catalyst system. The catalyst used in the process includes a mixed metal sulfide catalyst that comprises at least one Group VIB metal and at least one Group VIII metal. The process also provides for hydroisomerization and hydrofinishing process steps to prepare the lubricating base oil.

대표청구항 ▼

1. A process for hydrocracking a lubricating oil feedstock comprising: blending a straight run crude oil distillate feedstock and a hydroprocessed feedstream to form a lubricating oil feedstock having a nitrogen content of greater than 300 ppm and a sulfur content of greater than 0.1 wt. %; wherein

1. A process for hydrocracking a lubricating oil feedstock comprising: blending a straight run crude oil distillate feedstock and a hydroprocessed feedstream to form a lubricating oil feedstock having a nitrogen content of greater than 300 ppm and a sulfur content of greater than 0.1 wt. %; wherein the crude oil distillate has a viscosity at 100° C. in a range from 3 cSt to 30 cSt and the hydroprocessed feedstream has a viscosity at 100° C. in a range from 2 cSt to 30 cSt;hydrocracking the lubricating oil feedstock with a hydrogen-containing treat gas over a self-supported mixed metal sulfide catalyst under hydrocracking conditions to form a hydrocrackate, wherein at least 10 wt. % of the feedstock is converted to products which boil below the initial boiling point of the feedstock;separating the hydrocrackate by atmospheric distillation or vacuum distillation into at least a gaseous product that contains ammonia, and a liquid fraction that boils above the initial boiling point of the feedstock and has a nitrogen content of less than 50 ppm;dewaxing the liquid fraction in the presence of a hydrogen-containing treat gas stream over a shape selective intermediate pore size molecular sieve catalyst at hydroisomerization conditions, to produce a dewaxed effluent having a pour point of less than −5° C.; andproviding the dewaxed effluent to a hydrofinishing reaction zone for hydrogenating the dewaxed effluent over a hydrofinishing catalyst;to form a heavy lubricating base oil having a viscosity index of greater than 95 and a viscosity at 100° C. of 10 cSt or greater;wherein the self-supported mixed metal sulfide catalyst comprises at least one Group VIB metal and at least one Group VIII metal and is prepared by drying at a temperature of 200° C. or less, then sulfidizing a self-supported charge-neutral hydroxide catalyst precursor composition of the formula: Av[(MP)(OH)x(L)ny]z(MVIBO4)wherein A is at least one of an alkali metal cation, an ammonium, an organic ammonium and a phosphonium cation, MP is at least one of a Group VIII metal, Group IIB metal, Group IIA metal, Group IVA metal or combinations thereof, P is an oxidation state with MP having an oxidation state of +2 or +4 depending on the selection of MP, MVIB is at least a Group VIB metal having an oxidation state of +6, L is at least one oxygen-containing ligands, and L has a neutral or negative charge n<=0; MP:MVIB has an atomic ratio between 100:1 and 1:100; v−2+P*z−x*z+n*y*z=0; and 0