Use of cardanol aldehyde resins as asphalt dispersants in crude oil

Abstract

The invention relates to the use of resins, obtained by a reaction of cardanol with a compound of formula (1), where R1═H, COH, COOH, COOR2 or R2, R2═C1-C30 alkyl, C2-C30 alkenyl, C6-C18 aryl or C7-C30 alkaryl with a number average molecular weight of 250 to 100,000 units, in amounts of 0.5 to 10,000 ppm relative to the oil, for the dispersion of asphalts in crude oils or products derived therefrom.

1 . The use of resins obtainable by reacting cardanol with a compound of the formula (1)  
       
         
           
           
               
               
           
         
       
       in which 
 R 1  is H, CHO, COOH, COOR 2  or R 2 , and  
 R 2  is C 1 -C 30 -alkyl, C 2 -C 30 -alkenyl, C 6 -C 18 -aryl or C 7 -C 30 -alkylaryl, and which have a number-average molecular weight of from 250 to 100 000 units, in amounts of from 0.5 to 10 000 ppm, based on the oil, for dispersing asphaltenes in crude oils or products derived therefrom.  
 
     
     
         2 . The use as claimed in  claim 1 , where cardanol is reacted in a mixture with alkylphenols of the formula (7) in the ratio 100:1 to 1:100 
       
         
           
           
               
               
           
         
       
       in which R 4  and OH may be in the ortho, meta or para position relative to one another, and R 4  is C 1 - to C 30 -alkyl, C 6 - to C 30 -alkenyl, C 6 - to C 18 -aryl or C 7 - to C 30 -alkylaryl.  
     
     
         3 . The use as claimed in  claim 1  and/or  2 , where R 1  is an alkyl or alkenyl radical having 6 to 24 carbon atoms.  
     
     
         4 . The use as claimed in one or more of claims  1  and/or  2 , where R 1  is CHO.  
     
     
         5 . The use as claimed in  claim 4 , where the resin obtained from the reaction is esterified or etherified.  
     
     
         6 . A process for dispersing asphaltenes in crude oils and products derived therefrom, which comprises adding cardanol-aldehyde resins as claimed in one or more of  claims 1  to  5  in an amount of from 0.5 to 10 000 ppm.  
     
     
         7 . The process as claimed in  claim 6 , wherein alkylphenol formaldehyde resins, oxyalkylated amines, mono- or dialkylsulfonic acids, petroleum acids, alkanesulfonic acids, wax dispersant or any mixtures thereof are additionally used.  
     
     
         8 . A crude oil or a product derived therefrom comprising an asphaltene dispersant as claimed in one or more of  claims 1  to  5 .