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US 6,951,605 B2Granted
Method for making lube basestocks
AssigneeExxonMobil Research and Engineering Company
InventorsIan A. Cody, William J. Murphy
Life of this patent
Estimating the term…
Abstract
A method to produce high quality lube oil products involving hydrotreating a waxy feed to produce a hydrotreated feed and subsequently hydrodewaxing the hydrotreated feed and hydrofinishing the hydrodewaxed feed.
Claims18
A process to prepare lubricating oil basestocks having a VI of at least about 110 to about 130 from a lube oil boiling range feedstock comprising:
- a) conducting a lubricating oil feedstock to a solvent extraction zone and underextracting the lubricating oil feedstock under conditions effective at producing at least an aromatics-lean raffinate solution;
- b) removing at least a portion of the extraction solvent from the aromatics-lean raffinate solution to produce a raffinate feedstock having a dewaxed oil viscosity index from about 75 to about 105 and a wax content of greater than 15 wt. %;
- c) contacting the raffinate feedstock with a hydrotreating catalyst in a first reaction stage operated under effective conditions to produce at least a gaseous product and a hydrotreated feedstock, wherein said hydrotreating catalyst has an acidity value of less than about 0.5, as determined by the scale of acidity for catalysts described by Kramer and McVicker, J. Catalysis, 92, 355 (1985);
- d) stripping the hydrotreated feedstock to separate at least a portion of the gaseous product from the hydrotreated feedstock to produce a stripped feedstock;
- e) contacting the stripped feedstock with a ZSM-48 dewaxing catalyst in a dewaxing zone operated under effective hydrodewaxing conditions, wherein said dewaxing catalyst contains Pt, Pd or mixtures thereof, thereby producing a lubricating oil basestock;
- and
- f) contacting the lubricating oil basestock from step e) with a mesoporous hydrofinishing catalyst from the M41S family in a hydrofinishing zone operated under effective hydrofinishing conditions to produce a hydrofinished lubricating oil basestock.
4 more elements
A process to prepare lubricating oil basestocks having a VI of at least about 110 to about 130 from a lube oil boiling range feedstock comprising:
- a) conducting a lubricating oil feedstock to a solvent extraction zone and under-extracting the lubricating oil feedstock under conditions effective at producing at least an aromatics-lean raffinate solution;
- b) removing at least a portion of the extraction solvent from the aromatics-lean raffinate solution to produce a raffinate feedstock having a dewaxed oil viscosity index from about 75 to about 105 and a wax content of at least about 15 wt. %;
- c) contacting the raffinate feedstock with a hydrotreating catalyst containing at least one metal selected from Group VI metals, Group VIII metals, and mixtures thereof in a first reaction stage operated under effective conditions to produce at least a gaseous product and a hydrotreated feedstock, wherein said hydrotreating catalyst has an acidity value of less than about 0.5, as determined by the scale of acidity for catalysts described by Kramer and McVicker, J. Catalysis, 92, 355 (1985) and wherein said effective hydrotreating conditions are selected such that less than 5 wt. % of the feedstock is converted to 65° F. (343° C.) minus products, and wherein the VI increase of said hydrotreated feedstock is less than 4 greater than the VI of the lube oil boiling range feedstock.
- d) stripping the hydrotreated feedstock to separate at least a portion of the gaseous product from the hydrotreated feedstock to produce a stripped feedstock;
- e) contacting the stripped feedstock with ZSM-48 dewaxing catalyst in a dewaxing zone operated under effective hydrodewaxing conditions, wherein said dewaxing catalyst contains Pt, Pd or mixtures thereof, thereby producing a lubricating oil basestock;
- and
- f) contacting the lubricating oil basestock with a MCM-41 hydrofinishing catalyst containing at least one noble metal in a hydrofinishing zone operated under effective hydrofinishing conditions thereby producing a hydrofinished lubricating oil basestock.
4 more elements
Dependencies are inferred from the claim text.