Lube Basestock With Improved Low Temperature Properties

Abstract

This invention relates to basestocks and base oils with improved low temperature properties and formulated lubricant compositions or functional fluids created by blending at least one such lube basestock with at least one component selected from dispersants, detergents, wear inhibitors, antioxidants, rust inhibitors, demulsifiers, extreme pressure agents, friction modifiers, multifunction additives, viscosity index improvers, pour point depressants, and foam inhibitors. In particular the invention relates to dewaxed lube basestocks having a Free Carbon Index of less than 4.3 and an Epsilon Carbon mole % of less than 14%. Formulated engine oils using such dewaxed basestocks exhibit improved low temperature properties as may be measured by the Mini Rotary Viscometer test.

1 . A dewaxed lube basestock having a Free Carbon Index of less than 4.3 and an Epsilon Carbon mole % of less than 14%. 
     
     
         2 . A dewaxed lube basestock having a Free Carbon Index of less than 4.1 and an Epsilon Carbon mole % of less than 13.3%. 
     
     
         3 . A dewaxed lube basestock having a Free Carbon Index of from 3.0 to 4.3 and a Epsilon Carbon mole % from 10.0% to 14.0%. 
     
     
         4 . A dewaxed lube basestock according to  claim 1  wherein the Pour Point is between −6° C. and −30° C. 
     
     
         5 . A dewaxed lube basestock according to  claim 2  wherein the Pour Point is between −6° C. and −30° C. 
     
     
         6 . A dewaxed lube basestock according to  claim 1  wherein the Pour Point is between −15° C. and −24° C. 
     
     
         7 . A dewaxed lube basestock according to  claim 2  wherein the Pour Point is between −15° C. and −24° C. 
     
     
         8 . A dewaxed lube basestock according to  claim 1  wherein the kinematic viscosity at 100° C. is between 3 cSt and 7 cSt, the Viscosity Index is between 95 and 150, and the Pour Point is between −6° C. and −30° C. 
     
     
         9 . A dewaxed lube basestock according to  claim 1  wherein the kinematic viscosity at 100° C. is between 3 cSt and 7 cSt, the Viscosity Index is between 100 and 120, and the Pour Point is between −15° C. and −24° C. 
     
     
         10 . A dewaxed lube basestock according to  claim 2  wherein the kinematic viscosity at 100° C. is between 3 cSt and 7 cSt, the Viscosity Index is between 100 and 120, and the Pour Point is between −15° C. and −24° C. 
     
     
         11 . A dewaxed lube basestock according to  claim 1  wherein the kinematic viscosity at 100° C. is between 4 cSt and 5 cSt, the Viscosity Index is between 100 and 120, and the Pour Point is between −15° C. and −24° C. 
     
     
         12 . A dewaxed lube basestock having a Free Carbon Index of less than 4.3 and an Epsilon Carbon mole % of less than 14% prepared by a process comprising
 a) solvent dewaxing a lube oil boiling range feedstream in a solvent dewaxing stage operated under effective solvent dewaxing conditions thereby producing at least a partially dewaxed fraction; and   b) contacting said partially dewaxed fraction with a hydrodewaxing catalyst in the presence of a hydrogen-containing treat gas in a reaction stage operated under effective hydrodewaxing conditions thereby producing a reaction product comprising at least a gaseous product and liquid product, wherein said liquid product comprises a dewaxed lube basestock.   
     
     
         13 . A dewaxed lube basestock according to  claim 12  wherein said hydrodewaxing catalyst is selected from ZSM-5, ZSM-22, ZSM-23, ZSM-35, ZSM-48, ZSM-57, Beta, SSZ-31, SAPO-11, SAPO-31, SAPO-41, MAPO-11, ECR-42, fluorided alumina, silica-alumina, fluorided silica alumina, synthetic Ferrierites, Mordenite, Offretite, Erionite, Chabazite, and mixtures thereof under effective catalytic dewaxing conditions. 
     
     
         14 . A dewaxed lube basestock according to  claim 13  wherein said hydrodewaxing catalyst comprises a zeolite selected from ZSM-48, ZSM-22 and ZSM-23. 
     
     
         15 . A dewaxed lube basestock according to  claim 14  wherein said hydrodewaxing catalyst further comprises at least one metal hydrogenation component, which is selected from Group VI metals, Group VIII metals, or mixtures thereof and contains at least one Group VIII noble metal. 
     
     
         16 . A formulated oil comprising:
 a) a major amount of at least one dewaxed lube basestock according to  claim 4 ,   b) at least one component selected from dispersants, detergents, wear inhibitors, antioxidants, rust inhibitors, demulsifiers, extreme pressure agents, friction modifiers, multifunction additives, viscosity index improvers, pour point depressants, and foam inhibitors.   
     
     
         17 . A formulated oil according to  claim 16  wherein the formulated oil is an engine oil. 
     
     
         18 . An engine oil according to  claim 17  wherein said engine oil has a Mini Rotary Viscometer viscosity from about 10,000 cP to about 30,000 cP. 
     
     
         19 . An engine oil according to  claim 17  wherein said engine oil has a Mini Rotary Viscometer viscosity from about 10,000 cP to about 25,000 cP. 
     
     
         20 . An engine oil according to  claim 17  wherein said engine oil has a Mini Rotary Viscometer viscosity from about 12,000 cP to about 20,000 cP. 
     
     
         21 . An engine oil comprising:
 a) at least 60% by weight of the total composition of a dewaxed lube basestock having a Free Carbon Index of from 3.0 to 4.3 and an Epsilon Carbon mole % from 10.0% to 14.0% and wherein the kinematic viscosity at 100° C. is between 3 cSt and 7 cSt, the Viscosity Index is between 95 and 150, and the Pour Point is between −6° C. and −30° C.   b) at least one component selected from dispersants, detergents, wear inhibitors, antioxidants, rust inhibitors, demulsifiers, extreme pressure agents, friction modifiers, multifunction additives, viscosity index improvers, pour point depressants, and foam inhibitors, and   
       wherein the said engine oil has a Mini Rotary Viscometer viscosity from about 10,000 cP to about 25,000 cP. 
     
     
         22 . An engine oil comprising:
 a) at least 60% by weight of the total composition of a dewaxed lube basestock having a Free Carbon Index of from 3.0 to 4.3 and an Epsilon Carbon mole % from 10.0% to 14.0% and wherein the kinematic viscosity at 100° C. is between 3 cSt and 7 cSt, the Viscosity Index is between 95 and 150, and the Pour Point is less than −6° C. and wherein said dewaxed lube basestock is prepared by a process comprising
 (i) solvent dewaxing a lube oil boiling range feedstream in a solvent dewaxing stage operated under effective solvent dewaxing conditions thereby producing at least a partially dewaxed fraction; and 
 (ii) contacting said partially dewaxed fraction with a hydrodewaxing catalyst in the presence of a hydrogen-containing treat gas in a reaction stage operated under effective hydrodewaxing conditions thereby producing a reaction product comprising at least a gaseous product and liquid product, wherein said liquid product comprises a dewaxed lube basestock. 
   b) at least one component selected from dispersants, detergents, wear inhibitors, antioxidants, rust inhibitors, demulsifiers, extreme pressure agents, friction modifiers, multifunction additives, viscosity index improvers, pour point depressants, and foam inhibitors, and   
       wherein the said engine oil has a Mini Rotary Viscometer viscosity from about 10,000 cP to about 25,000 cP. 
     
     
         23 . An engine oil comprising:
 a) at least 60% by weight of the total composition of a dewaxed lube basestock having a Free Carbon Index of from 3.0 to 4.3 and an Epsilon Carbon mole % from 10.0% to 14.0% and wherein the kinematic viscosity at 100° C. is between 3 cSt and 7 cSt, the Viscosity Index is between 95 and 150, and the Pour Point is less than −6° C. and wherein said dewaxed lube basestock is prepared by a process comprising
 (i) solvent dewaxing a lube oil boiling range feedstream in a solvent dewaxing stage operated under effective solvent dewaxing conditions thereby producing at least a partially dewaxed fraction; and 
 (ii) contacting said partially dewaxed fraction with a hydrodewaxing catalyst in the presence of a hydrogen-containing treat gas in a reaction stage operated under effective hydrodewaxing conditions thereby producing a reaction product comprising at least a gaseous product and liquid product, wherein said liquid product comprises a dewaxed lube basestock. 
   b) at least one component selected from dispersants, detergents, wear inhibitors, antioxidants, rust inhibitors, demulsifiers, extreme pressure agents, friction modifiers, multifunction additives, viscosity index improvers, pour point depressants, and foam inhibitors, and   
       wherein the said engine oil has a Mini Rotary Viscometer viscosity from about 10,000 cP to about 25,000 cP. 
     
     
         24 . A method of formulating an engine oil comprising blending a dewaxed lube basestock as characterized in  claim 6  with at least one component selected from dispersants, detergents, wear inhibitors, antioxidants, rust inhibitors, demulsifiers, extreme pressure agents, friction modifiers, multifunction additives, viscosity index improvers, pour point depressants, and foam inhibitors.