FIELD: chemistry.
SUBSTANCE: present invention relates to use of at least one oil-soluble compound B), which acts as a nucleating agent for paraffin crystallisation and which is selected from copolymers of ethylene and 5-10.5 mol % of at least one ethylenically unsaturated carboxylic ester for improving response of additives C) for improving cold flow of mineral oil, different from B), in middle distillates which contain at least one ash-free, nitrogen-containing detergent additive A), which is an oil-soluble amphiphilic compound which contains at least one alkyl or alkenyl radical bound to a polar group, said alkyl or alkenyl radical having 10-500 carbon atoms and the polar group having 2 or more nitrogen atoms. The additives C) used to improve cold flow contain oil-soluble polar nitrogenous compounds. The present invention also relates to an additive for middle distillates and a middle distillate having sulphur content lower than 100 ppm and 90% final boiling point lower than 360°C.
EFFECT: use of oil-soluble compounds as nucleating agents for paraffin crystallisation in order to prevent deterioration of efficiency of traditional additives for improving cold flow under the action of nitrogen-containing detergent additives.
24 cl, 47 ex, 4 tbl
