Process for preparing basestocks having high VI
AssigneeExxonMobil Research and Engineering Company
InventorsIan A. Cody, William J. Murphy, Sylvain Hantzer, David W. Larkin, John E. Gallagher, Jr., Jeenok T. Kim
Life of this patent
Estimating the term…
Abstract
A process for preparing high VI lubricating oil basestocks comprising hydrotreating, hydrodewaxing and optionally hydrofinishing. The hydrotreating step is under conditions such that the amount of conversion to 343° C. minus is less than 5 wt. % of the feedstock and the VI increase is less than 4 VI over the feedstock. Hydrodewaxing uses a low alpha catalyst and hydrofinishing is accomplished with a catalyst based on the M41S family.
Claims26
A process for preparing a lubricating oil basestock having a VI of at least about 135 which comprises:
- (1) hydrotreating a lubricating oil feedstock having a wax content of at least about 60 wt. %, based on feedstock, with a hydrotreating catalyst under effective hydrotreating conditions such that less than 5 wt. % of the feedstock is converted to 650° F. (343° C.) minus products to produce a hydrotreated feedstock whose VI increase is less than 3 greater than the VI of the feedstock;
- (2) stripping the hydrotreated feedstock to separate gaseous from liquid product;
- and
- (3) hydrodewaxing the liquid product with a dewaxing catalyst which is ZSM-48 under catalytically effective hydrodewaxing conditions wherein the dewaxing catalyst contains at least one of Pt or Pd and hydrodewaxing produces a dewaxed product having a pour point of −17° C. or less.
A process for preparing a lubricating oil basestock having a VI of at least about 125 which comprises:
- (1) hydrotreating a lubricating oil feedstock having a wax content of at least about 50 wt. %, based on feedstock, with a hydrotreating catalyst under effective hydrotreating conditions such that less than 5 wt. % of the feedstock is converted to 650° F. (343° C.) minus products to produce a hydrotreated feedstock to produce a hydrotreated feedstock whose VI increase is less than 3 greater than the VI of the feedstock;
- (2) stripping the hydrotreated feedstock to separate gaseous from liquid product;
- (3) hydrodewaxing the liquid product with a dewaxing catalyst which is ZSM-48 under catalytically effective hydrodewaxing conditions wherein the dewaxing catalyst contains at least one of Pt or Pd and hydrodewaxing produces a dewaxed product having a pour point of −17° C. or less;
- and
- (4) hydrofinishing the product from step (3) with a mesoporous hydrofinishing catalyst from the M41S family under hydrofinishing conditions.
A process for preparing a lubricating oil basestock having a VI of at least about 135 which comprises:
- (1) hydrotreating a lubricating oil feedstock having a wax content of at least about 60 wt. %, based on feedstock, with a hydrotreating catalyst under effective hydrotreating conditions such that less than 5 wt. % of the feedstock is converted to 650° F. (343° C.) minus products to produce a hydrotreated feedstock to produce a hydrotreated feedstock whose VI increase is less than 3 greater than the VI of the feedstock;
- (2) stripping the hydrotreated feedstock to separate gaseous from liquid product;
- (3) hydrodewaxing the liquid product with a dewaxing catalyst which is ZSM-48 under catalytically effective hydrodewaxing conditions wherein the dewaxing catalyst contains at least one of Pt or Pd wherein hydrodewaxing produces a 370° C.+dewaxed product in a yield of greater than 50 wt. % based on feed to the hydrodewaxing and having a pour point of −17° C. or less, and
- (4) hydrofinishing the product from step (3) with MCM-41 under hydrofinishing conditions wherein hydrofinished product has an aromatics content of about zero.
Dependencies are inferred from the claim text.