Oil composition and method of detecting a marker in an oil composition

Abstract

Oil composition is provided containing a major amount of a natural and/or synthetic base oil and, as a marking substance, a detectable level of one or more compounds of formula IV compound supported thereon, such that the marking substance gives a colour reaction A method for detecting the presence of a marking substance in an oil composition is provided, wherein the oil composition is contacted with a test strip having an acidic upon contact with the test strip.

1 . An oil composition comprising at least one compound of formula IV;  
       
         
           
           
               
               
           
         
       
       wherein R 1 -R 9  are the same or different and are independently chosen from hydrogen, C 1-5  alkyl and other non-conjugated groups; R 10  is chosen from hydrogen and C 1-15  alky; and R 1  is a conjugated group, and a natural and/or synthetic base oil, said compounds of formula IV useful to give a colour reaction under action of an aqueous solution of protic acid.  
     
     
         2 . A method for detecting the presence of a marking substance in an oil composition which comprises a major amount of a natural and/or synthetic base oil and a detectable level of a marling substance, wherein the oil composition is contacted with a test strip comprising an acidic compound supported thereon, such that said marking substance gives a colour reaction upon contact with the test strip, wherein the oil composition comprises a major amount of a natural and/or synthetic base oil and, as a marking substance, a detectable level of at least one compound of formula IV  
       
         
           
           
               
               
           
         
         wherein R 1 -R 9  are the same or different and are independently chosen from hydrogen, C 1-15  alkyl and other non-conjugated groups; R 10  is chosen from hydrogen and C 1-15  alkyl; and R 11  is a conjugated group.  
       
     
     
         3 . The method of  claim 2  wherein the oil composition comprises, as a marking substance, a detectable level of at least one compounds of formula V  
       
         
           
           
               
               
           
         
         wherein R 1 -R 9  are the same or different and are independently chosen from hydrogen, C 1-15  alkyl and other non-conjugated groups; R 10  is chosen from hydrogen and C 1-15  alkyl; and R 12 -R 16  are the same or different and are independently chosen from hydrogen, C 1-5  alkyl and other non-conjugated groups.  
       
     
     
         4 . The method of  claim 2  wherein the oil composition comprises an amount in the range of from 1 ppmw to 400 ppmw of compounds of formulae IV based on the total weight of the oil composition.  
     
     
         5 . The method  claim 2  wherein the oil composition is a fuel oil composition.  
     
     
         6 . The method  claim 2  wherein the oil composition is a lubricating oil composition.  
     
     
         7 . The method  claim 2  wherein the acidic compound is adsorbed on a carrier prior to being supported on the test strip.  
     
     
         8 . The method  claim 2  wherein the acidic compound is selected from the group consisting of trichloroacetic acid, hydrochloric acid, sulphuric acid, 4-dodecylbenzene sulphonic acid (DBSA), picric acid and benzene sulphonic acid.  
     
     
         9 . The method of  claim 3 , wherein the oil composition comprises an amount in the range of from 1 pDmw to 400 ppmw of compounds of formula V based on the total weight of the oil composition.  
     
     
         10 . The method of  claim 3 , wherein the acidic compound is adsorbed on a carrier prior to being supported on the test strip.  
     
     
         11 . The method of  claim 8 , wherein the acidic compound is adsorbed on a carrier prior to being supported on the test strip.