Patent ID: 7597795
Filing Date: 2009-10-06
Classification: B01J,C10G

Abstract:
1. A process to prepare lubricating oil basestocks having a VI of at least about 80 to about 120 from a lube oil boiling range feedstock comprising: a) extracting a lubricating oil feedstock having a distillation endpoint greater than 800° F. (426° C.), measured by ASTM D 86 or ASTM 2887, in a solvent extraction zone with an extraction solvent under conditions effective at producing at least an aromatics-lean raffinate solution containing extraction solvent; b) removing at least a portion of the extraction solvent from the aromatics-lean raffinate solution to produce a raffinate feedstock; c) contacting the raffinate feedstock with a stacked bed hydrotreating catalyst system comprising at least a first and second hydrotreating catalyst in a reaction stage operated under effective conditions thereby producing a hydrotreated effluent comprising at least a gaseous product and a hydrotreated raffinate; and d) dewaxing said hydrotreated raffinate under effective dewaxing conditions thereby producing at least a lubricating oil basestock having a saturates content of at least 90%, a sulfur content of 0.03 wt. % or less, and a viscosity index (VI) between 80 and 120, wherein said first hydrotreating catalyst is selected from supported hydrotreating catalysts comprising about 2 to 20 wt. % of at least one Group VIII metal, and about 5 to 50 wt. % of at least one Group VI metal on a high surface area support material having an average pore diameter of greater than 10 nm and said second hydrotreating catalyst is a bulk metal hydrotreating catalyst comprising about 30 to about 100 wt. % of at least one Group VIII non-noble metal and at least one Group VIB metal, based on the total weight of the bulk catalyst particles, calculated as metal oxides and wherein the bulk catalyst particles have a surface area of at least 10 m