Compositions And Methods Of Dispergating Paraffins In Sulphur-Low Fuel Oils

A method of improving the low-temperature properties of a fuel oil having a sulfur content of less than 50 ppm, comprising a lubricity additive (C) and a resin formed from at least one aromatic compounds bearing an alkyl radical and an aldehyde and/or ketone (D), wherein the method comprises the step of adding a low-temperature additive to the fuel oil, and in which the low-temperature additive comprises

• i) at least one oil-soluble amide-ammonium salt of a polycarboxylic acid with a mono- and/or dialkylamine (A) and
• ii) 5-100% by weight, based on the amount of amide-ammonium salt (A), of an oil-soluble amine (B), and
• iii) 0.1 to 10 parts by weight, based on the amount of amide-ammonium salt (A), of a resin formed from at least one aromatic compound bearing an alkyl radical and an aldehyde and/or ketone (D)
• wherein the fuel oil contains between 50 and 1000 ppm of a lubricity additive (C) which is selected from the group consisting of fatty acids, oligomers of unsaturated fatty acids, alk(en)ylsuccinic acids, partial esters of polyols with fatty acids, oligomers of unsaturated fatty acids, alk(en)ylsuccinic acids, fatty acid amides of alkanolamines and mixtures thereof.

A fuel oil having a sulfur content of less than 50 ppm, comprising a lubricity additive (C) and a low-temperature additive, in which the low-temperature additive comprises

• i) at least one oil-soluble amide-ammonium salt of a polycarboxylic acid with a mono- and/or dialkylamine (A) and
• ii) 5-100% by weight, based on the amount of amide-ammonium salt (A), of an oil-soluble amine (B), and
• iii) 0.1 to 10 parts by weight, based on the amount of amide-5 ammonium salt (A), of a resin formed from at least one aromatic compound bearing an alkyl radical and an aldehyde and/or ketone (D),
• and in which the lubricity additive (C) is selected from the group consisting of fatty acids, oligomers of unsaturated fatty acids, alk(en)ylsuccinic acids, partial esters of polyols with fatty acids, oligomers of unsaturated fatty acids and/or alk(en)ylsuccinic acids, fatty acid amides of alkanolamines, and mixtures thereof.