Use of Mixtures of Monocarboxylic Acids and Polycyclic Hydrocarbon Compounds for Improving the Storage Stability of Fuel Additive Concentrates

Abstract

The use of mixtures of (A) aliphatic saturated or unsaturated monocarboxylic acids having from 12 to 24 carbon atoms or their dimerization or trimerization products, or their ammonium salts, amides, esters or nitrites, and (B) polycyclic hydrocarbon compounds which are obtainable from distillation residues of natural oils which have been extracted from tree resins for improving the storage stability of fuel additive concentrates which comprise at least one detergent and at least one cetane number improver, the mixtures of components (A) and (B) being used in a concentration of from 0.7 to 20% by weight based on the total amount of the fuel additive concentrate.

1 . The method of using mixtures of
 (A) aliphatic saturated or unsaturated monocarboxylic acids having from 12 to 24 carbon atoms or their dimerization or trimerization products, which may be present as free carboxylic acids and/or in the form of ammonium salts, amides, esters and/or nitrites, and   (B) polycyclic hydrocarbon compounds which contain carboxyl groups and are obtainable from distillation residues of natural oils which have been extracted from tree resins   for improving the storage stability of fuel additive concentrates which comprise at least one detergent and at least one cetane number improver, the mixtures of components (A) and (B) being used in a concentration of from 0.7 to 20% by weight based on the total amount of the fuel additive concentrate.   
   
   
       2 . The method according to  claim 1 , in which the fuel additive concentrates comprise at least one detergent having moieties which are derived from succinic anhydride and have hydroxyl and/or amino and/or amido and/or imido groups. 
   
   
       3 . The method according to  claim 2 , in which the fuel additive concentrates comprise at least one polyisobutenyl-substituted succinimide as a detergent. 
   
   
       4 . The method according to  claim 1 , in which the fuel additive concentrates comprise 2-ethylhexyl nitrate as the cetane number improver. 
   
   
       5 . The method according to  claim 1 , in which the carboxylic acids (A) and the polycyclic hydrocarbon compounds containing carboxyl groups (B) are present in the mixture in a weight ratio of from 65:35 to 99.9:0.1, in particular from 90:10 to 99.9:0.1. 
   
   
       6 . The method according to  claim 1 , in which the mixture of carboxylic acids (A) and polycyclic hydrocarbons containing carboxyl groups (B) used is tall oil fatty acid or dimerized tall oil fatty acid. 
   
   
       7 . The method according to  claim 1 , in which the mixture of carboxylic acids (A) and polycyclic hydrocarbon compounds containing carboxyl group (B) is used in amounts of from 0.7 to 20% by weight, in particular from 1.5 to 10% by weight, based on the total amount of the fuel additive concentrate. 
   
   
       8 . A fuel additive concentrate comprising, based in each case on the total amount of the fuel additive concentrate,
 (a) from 0.5 to 60% by weight of one or more detergents which have moieties which are derived from succinic anhydride and have hydroxyl and/or amino and/or amido and/or imido groups,   (b) from 0.5 to 80% by weight of one or more cetane number improvers and   (c) from 0.7 to 20% by weight of a mixture of carboxylic acids (A) and polycyclic hydrocarbon compounds containing carboxyl groups (B) according to  claim 1 .