Diesel fuel additive composition and scouring method using the same

Abstract

A diesel fuel additive composition comprising (a) polyoxyalkylene alkyl amine represented by Formula (1) below, (b) glycol monoalkyl ether represented by Formula (2) below, (c) glycol dialkyl ether represented by Formula (3) below, (d) a heterocyclic compound, and (e) water, wherein the diesel fuel additive composition contains component at 50 to 80% by weight, component (b) at 5 to 20% by weight, component (c) at 5 to 15% by weight, component (d) at 5 to 15% by weight, and component (e) at 1 to 5% by weight; (wherein R 1 represents an alkyl group with a carbon number from 8 to 25, each of A 1 and A 2 is an alkylene group with a carbon number from 2 to 4, k and 1 respectively represent a number from 1 to 30, each of R 2 , R 3 and R 4 is an alkyl group with a carbon number from 1 to 8, each of A 3 and A 4 is an alkylene group with a carbon number of 2 or 3, and each of m and n represents a number from 1 to 4).

1 . A diesel fuel additive composition comprising
 (a) polyoxyalkylene alkyl amine represented by Formula (1) below,   (b) glycol monoalkyl ether represented by Formula (2) below,   (c) glycol dialkyl ether represented by Formula (3) below,   (d) a heterocyclic compound, and   (e) water;   
     wherein the diesel fuel additive composition contains said component at 50 to 80% by weight, said component (b) at 5 to 20% by weight, said component (c) at 5 to 15% by weight, said component (d) at 5 to 15% by weight, and said component (e) at 1 to 5% by weight; 
     
       
         
         
             
             
         
       
     
     (wherein R 1  represents an alkyl group with a carbon number from 8 to 25, each of A 1  and A 2  is an alkylene group with a carbon number from 2 to 4, when A 1 O and/or A 2 O are repeated, each of A 1  and A 2  may be either the same or different alkylene group, and k and 1 respectively represent a number from 1 to 30),
   R 2 O(A 3 O) m H  (2) 
 
     (wherein R 2  is an alkyl group with a carbon number from 1 to 8, A 3  is an alkylene group with a carbon number of 2 or 3, when A 3 O is repeated, A 3  may be either the same or different alkylene group, and m represents a number from 1 to 4), and
   R 3 O(A 4 O) n R 4   (3) 
 
     (wherein each of R 3  and R 4  is an alkyl group with a carbon number from 1 to 8, A 4  is an alkylene group with a carbon number of 2 or 3, when A 4 O is repeated, A 4  may be the same or different alkylene group, and n represents a number from 1 to 4). 
   
   
       2 . The diesel fuel additive composition according to  claim 1 , wherein said component (a) is lauryl diethanolamine. 
   
   
       3 . The diesel fuel additive composition according to  claim 1 , wherein said component (b) comprises one, or two or more selected from the group consisting of ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether and dipropylene glycol dimethyl ether. 
   
   
       4 . The diesel fuel additive composition according to  claim 1 , wherein said component (c) comprises one, or two or more selected from the group consisting of diethylene glycol dimethyl ether, diethylene glycol dibutyl ether and dipropylene glycol dimethyl ether. 
   
   
       5 . The diesel fuel additive composition according to  claim 1 , wherein said component (d) comprises one, or two or more selected from the group consisting of N-methyl-2-pyrrolidone, 1,4 dioxane and γ-butyrolactone. 
   
   
       6 . The diesel fuel additive composition according to  claim 1 , wherein a content ratio of said component (e) to said component (a) (content (e)/content (a)) is not higher than 0.1. 
   
   
       7 . The diesel fuel additive composition according to  claim 1 , wherein said diesel fuel additive composition is used by being add at 0.5 to 2% by weight to diesel fuel. 
   
   
       8 . A method of scouring and removing a polymer-substance derived deposit, a water-soluble deposit and a water-insoluble deposit adhering to an injector nozzle of a diesel engine equipped with a common-rail type fuel injector, comprising;
 adding the diesel fuel additive composition according to  claim 1  at  0 . 5  to  2 % by weight to diesel fuel.