Polyalphaolefins with improved oxidative stability and the process of making thereof

Abstract

The present invention relates to a process of producing a highly oxidatively stable polyalphaolefin by hydrogenating a polyalphaolefin to greatly decrease its level of unsaturation.

1 - 28 . (canceled)  
   
   
       29 . A method of producing high oxidative stability polyalphaolefins, comprising: 
 heating a polyalphaolefin mixture to a temperature sufficient to separate a 4 cSt polyalphaolefin fluid from the polyalphaolefin mixture;    separating a polyalphaolefin fluid from the polyalphaolefin mixture, wherein the polyalphaolefin fluid has a desired viscosity; and    hydrogenating the polyalphaolefin fluid to a level of hydrogenation in which a Bromine Index of less than 200 mg Bromine per 100 gram sample of polyalphaolefin is achieved.    
   
   
       30 . A method according to  claim 29  wherein the polyalphaolefin fluid has a viscosity of about 4 cSt.  
   
   
       31 . A method according to  claim 29  wherein the polyalphaolefin mixture is heated to a temperature sufficient to separate a 6 cSt polyalphaolefin fluid, and wherein separated polyalphaolefin fluid has a viscosity of about 6 cSt.  
   
   
       32 . A method according to  claim 29  wherein a Bromine Index of less than 100 mg Bromine per 100 gram sample of polyalphaolefin is achieved.  
   
   
       33 . A method according to  claim 29  wherein a Bromine Index of less than 50 mg Bromine per 100 gram sample of polyalphaolefin is achieved.  
   
   
       34 . A method according to  claim 29  wherein a Bromine Index of less than 25 mg Bromine per 100 gram sample of polyalphaolefin is achieved.  
   
   
       35 . A method according to  claim 29 , wherein the hydrogenating is conducted to a level of hydrogenation in which an RBOT level of at least 2200 minutes is achieved when 0.5 wt % diphenyl amine is used as an antioxidant.  
   
   
       36 . A method according to  claim 29 , wherein the hydrogenating is conducted to a level of hydrogenation in which a Lube Oil Oxidator level of at least 45 hours is achieved when pressures between 350 and 2500 psi are applied.  
   
   
       37 . A method of producing high oxidative stability polyalphaolefins, comprising: 
 heating a polyalphaolefin mixture to a first temperature sufficient to remove dimers from the polyalphaolefin mixture;    heating the polyalphaolefin mixture to a second temperature sufficient to remove a 4 cSt polyalphaolefin fluid from the polyalphaolefin mixture;    separating a polyalphaolefin fluid from the polyalphaolefin mixture, wherein the polyalphaolefin fluid has a desired viscosity; and    hydrogenating the polyalphaolefin fluid to a level of hydrogenation in which a Bromine Index of less than 200 mg Bromine per 100 gram sample of polyalphaolefin is achieved.    
   
   
       38 . A method according to  claim 37  wherein the polyalphaolefin fluid has a viscosity of about 4 cSt.  
   
   
       39 . A method according to  claim 37  wherein the polyalphaolefin mixture is heated to a temperature sufficient to separate a 6 cSt polyalphaolefin fluid, and wherein separated polyalphaolefin fluid has a viscosity of about 6 cSt.  
   
   
       40 . A method according to  claim 37  wherein a Bromine Index of less than 100 mg Bromine per 100 gram sample of polyalphaolefin is achieved.  
   
   
       41 . A method according to  claim 37  wherein a Bromine Index of less than 50 mg Bromine per 100 gram sample of polyalphaolefin is achieved.  
   
   
       42 . A method according to  claim 37  wherein a Bromine Index of less than 25 mg Bromine per 100 gram sample of polyalphaolefin is achieved.  
   
   
       43 . A method according to  claim 37 , wherein the hydrogenating is conducted to a level of hydrogenation in which an RBOT level of at least 2200 minutes is achieved when 0.5 wt % diphenyl amine is used as an antioxidant.  
   
   
       44 . A method according to  claim 37 , wherein the hydrogenating is conducted to a level of hydrogenation in which a Lube Oil Oxidator level of at least 45 hours is achieved when pressures between 350 and 2500 psi are applied.