Patent EA-001407-B1 (EA)
Title: Process for hydrotreating lubricating oil
Inventor: ZIEMER JAMES N
IPC: C10G2/00
Filed: 1997-06-26
Abstract: 1. A process for hydrotreating a lubricating oil, comprising contacting a lubricating oil base stock and hydrogen at hydrotreating reaction conditions in a hydrotreating reaction zone with a catalyst comprising a platinum-palladium alloy and an oxide matrix, wherein the oxide matrix comprises silica, alumina or combinations thereof, wherein the platinum to palladium molar ratio in the alloy is between 2.5:1 to 1:2.5, and wherein the lubricating oil base stock has a normal boiling point in the range from 600 degree F to 1050 degree F (316 degree C to 566 degree C) and a viscosity index of at least about 90 to produce a hydrotreated effluent comprising a hydrotreated lube oil. 2. The process according to claim 1 wherein at least a portion of the hydrotreated lube oil is charged to a catalytic dewaxer. 3. The process according to claim 2 wherein the entire effluent from the hydrotreating reaction zone is charged to a catalytic dewaxer. 4. The process according to claims 1 to 3 wherein the lubricating oil base stock contains less than 200 ppm sulfur. 5. The process according to claim 4 wherein the lubricating oil base stock contains less than 100 ppm sulfur. 6. The process according to claim 5 wherein the lubricating oil base stock contains less than 50 ppm sulfur. 7. The process according to claim 6 wherein the lubricating oil base stock contains in the range of about 10 to about 50 ppm sulfur. 8. The process according to any preceding claim wherein the lubricating oil base stock is an effluent from a hydrocracking process. 9. The process according to any claim 1 to 7 wherein the lubricating oil base stock is an effluent from a solvent extraction process. 10. The process according to any claim 1 to 7 wherein the lubricating oil base stock has been dewaxed in a catalytic dewaxer. 11. The process according to claim 10 wherein the lubricating oil base stock has a pour point of less than 10 degree C. 12. The process according to claim 11 wherein the lubricating oil base stock has a pour point of less than 0 degree C. 13. The process according to any preceding claim wherein the molar ratio of platinum to palladium in the alloy is 1:1.5. 14. The process according to any preceding claim wherein the catalyst comprises between 0.1 wt% and 1.0 wt% of the alloy. 15. The process according to any preceding claim wherein the oxide matrix comprises silica-alumina having a weight ratio of silica to alumina in the range from 1:10 to 10:1. 16. The process according to claim 15 wherein the oxide matrix comprises silica-alumina having a weight ratio of silica to alumina in the range from 25:75 to 75:25. 17. The process according to any preceding claim wherein the oxide matrix further comprises an aluminosilicate zeolite selected from zeolite Y, faujasite and ultrastable Y. 18. The process according to any preceding claim wherein the catalyst having a total pore volume greater than about 0.45 cm<3>/g, with at least 1% ofthe total pore volume being in macropores of diameter greater than 1000 Angstroms (10<-7>m). 19. The process according to claim 18 wherein the catalyst having a total pore volume greater than about 0.55 cm<3>/g. 20. The process according to claim 18 or 19 wherein at least 3% ofthe total pore volume being in macropores of diameter greater than 1000 Angstroms (10<-7>m). 21. The process according to any preceding claim wherein the oxide matrix contains at least 30 weight percent silica. 22. An integrated process for producing a lube oil from a petroleum feed stock containing sulfur comprising: a) upgrading the petroleum feedstock to produce a lubricating oil base stock having a normal boiling point within the range of 650 degree F to 1050 degree F (343 degree C to 566 degree C), a sulfur content of less than 200 ppm and a viscosity index of at least 80; b) contacting at least a portion of the lubricating oil base stock and hydrogen in a hydrotreating reaction zone with a catalyst comprising a platinum-palladium alloy and an oxide matrix, wherein molar ratio of platinum to palladium in the alloy is between 2.5:1 and 1:2.5, at a temperature in the range of between 625 degree F to 750 degree F (329 degree C to 399 degree C), for form a hydrotreated lube oil base stock; c) charging the hydrotreated lube oil to a catalytic dewaxer to form a dewaxed lube oil base stock; and d) contacting at least a portion of the dewaxed lube oil base stock with hydrogen in a hydrotreating reaction zone with a catalyst comprising a platinum-palladium alloy and an oxide matrix, wherein the oxide matrix comprises silica, alumina or combinations thereof, wherein the molar ratio of platinum to palladium in the alloy is between 2.5:1 and 1:2.5, at a temperature in the range of between 400 degree F and 625 degree F (204 degree C to 329 degree C) to form a finished lube oil. 23. The process according to claim 22 wherein the step of upgrading the petroleum feedstock is selected from the group consisting of a step of hydrocracking, or a step of solvent extraction, or combinations thereof. 24. The process according to any preceding claim wherein a single reactor includes at least one layer of a hydrotreating catalyst and at least one layer of a dewaxing catalyst. 25. The process according to any preceding claim wherein the hydrotreated lube oil contains greater than or equal to 90% saturates, less than or equal to 0.03 percent sulfur, and has a viscosity index greater than or equal to 80 and less than 120. 26. The process according to claims 1 to 24 wherein the hydrotreated lube oil contains greater than or equal to 90% saturates, less than or equal to 0.03 percent sulfur, and has a viscosity index greater than or equal to 120. 27. The process according to claims 1 to 24 wherein the hydrotreated lube oil is a U.S.P. technical grade white oil with a Saybolt color of 20 minimum as determined by ASTM D156-82. 28. The process according to claims 1 to 24 wherein the hydrotreated lube oil is a U.S.P. grade food white oil.