Properties of Hydroprocessed Base Oils

Abstract

Solvent extraction is applied to a hydrotreated base oil to create at least one higher quality product stream and at least one lower quality product stream, wherein the at least one higher quality product stream includes an improvement over the hydrotreated base oil in at least one of viscosity index, low temperature properties, volatility, and oxidation stability relative to that of the feedstock.

1 . A method comprising the step of applying to a hydrotreated base oil a solvent treatment comprising at least one solvent to produce at least one first base oil, and one or more additional base oils, wherein the at least one first base oil has a higher paraffinic content than occurred in the hydrotreated base oil. 
     
     
         2 . The method of  claim 1  wherein the hydrotreated base oil feedstock is derived from one of a crude oil feedstock and a used lubricating oil feedstock. 
     
     
         3 . The method of  claim 1  wherein the hydrotreated base oil has been hydrotreated under a pressure of at least 600 psig. 
     
     
         4 . The method of  claim 1 , further comprising a step of utilizing in the solvent treatment at least one of a preferentially selective paraffinic solvent, and at least one of a preferentially selective solvent for at least one of aromatic, polar, and naphthenic constituents. 
     
     
         5 . A method for controlling at least one of volatility and viscosity of a base oil product by applying to a hydrotreated base oil feedstock a solvent treatment in which a first base oil is created that has a VI that is greater than that of the hydrotreated base oil feedstock and a further fractionation step comprising no less than two of:
 a. removal of solvent from the raffinate from which the first base oil was made,   b. volatility of the first base oil that is at least one of (1) less than or equal to 15% or (2) less than or equal to 13%, in each case as measured by ASTM D-5800, and   c. viscosity of the first base oil that is less than that of the hydrotreated base oil feedstock.   
     
     
         6 . The method of  claim 5  wherein the hydrotreated base oil feedstock is derived from one of a crude oil feedstock and a used lubricating oil feedstock. 
     
     
         7 . The method of  claim 5  wherein the hydrotreated base oil contains at least 90% saturates. 
     
     
         8 . The method of  claim 5  wherein the hydrotreated base oil contains less than 300 PPM of sulfur. 
     
     
         9 . The method of  claim 5  wherein the hydrotreated base oil has been hydrotreated under a pressure of at least 600 psig. 
     
     
         10 . A method comprising a step of applying to a hydrotreated base oil feedstock a solvent treatment in which a first base oil is created that has an improved result, whenever tested either as a base oil or as a component of a finished lubricant, in at least one of the following ASTM tests relative to that of the hydrotreated base oil feedstock.
 a. Wear and Oil Thickening (D-7320),   b. Wear, Sludge, and Varnish Test (D-6593),   c. High Temperature Deposits, TEOST MHT (D-7097),   d. High Temperature Deposits TEOST 33C (D-6335),   e. Aged Oil Low Temperature Viscosity, ROBO Test (D-7528)   f. Aged Oil Temperature Low Temperature Viscosity (D-7320).   g. Determination of Oxidation Stability of Straight Mineral Oils (IP-306),   h. Test of Susceptibility of Ageing According to Baader (DIN 51554),   i. Oxidation Characteristics of Inhibited Mineral Oils (D-943),   j. Determination of the Sludging and Corrosion Tendencies of Inhibited Mineral Oils (D-4310),   k. Oxidation Stability of Steam Turbine Oils by Rotating Pressure Vessel Oxidation Test (RPVOT), (D-2272),   l. Determination of oxidation stability and insolubles formation of uninhibited turbine oils at 120° C. without the inclusion of water (Dry TOST Method) (D-7873),   m. Determination of Oxidation Stability of Inhibited Mineral Turbine Oils (IP-280),   n. 3462 Panel Coker Test (FTM 791A),   o. Standard Test Method for Corrosiveness and Oxidation Stability of Hydraulic Oils, Aircraft Turbine Engine Lubricants and Other Highly Refined Oils (D-4636),   p. Pneurop Oxidation (DIN 51352),   q. Standard Test Method for Thermal Stability of Hydraulic Oils (D-2070),   r. Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method) (D-2619), or   s. Oxidation Characteristics of Extreme Pressure Lubricating Oils (D-2893)   
     
     
         11 . The method of  claim 10  wherein the hydrotreated base oil feedstock is derived from one of a crude oil feedstock and a used lubricating oil feedstock. 
     
     
         12 . The method of  claim 10  wherein the hydrotreated base oil contains at least 90% saturates. 
     
     
         13 . The method of  claim 10  wherein the first base oil has a viscosity index of at least 120. 
     
     
         14 . The method of  claim 10  wherein the hydrotreated base oil has been hydrotreated under a pressure of at least 600 psig. 
     
     
         15 . A method comprising the step of applying to a hydrotreated base oil a solvent treatment comprising at least one solvent to create at least one product stream with an improvement in at least two of: a. viscosity index, b. volatility, and c. at least one of cold crank viscosity, Brookfield viscosity, pour point, and cloud point, relative to that of the feedstock. 
     
     
         16 . The method of  claim 15  wherein the hydrotreated base oil feedstock is derived from one of a crude oil feedstock and a used lubricating oil feedstock. 
     
     
         17 . The method of  claim 15  wherein the hydrotreated base oil contains at least 90% saturates. 
     
     
         18 . The method of  claim 15  wherein the hydrotreated base oil contains less than 300 PPM of sulfur. 
     
     
         19 . The method of  claim 15  wherein the first base oil has a viscosity index of at least 120. 
     
     
         20 . The method of  claim 15  wherein the hydrotreated base oil has been hydrotreated under a pressure of at least 600 psig. 
     
     
         21 . The method of  claim 15  wherein the hydrotreated base oil is hydrotreated at a pressure less than 1500 psig and a temperature less than 650° F.