INFLUENCE OF STRUCTURAL SPECIFICITY OF ESTERS ON THE OPERATIONAL PROPERTIES OF HYDROFINED DIESEL FUELS

The article is devoted to the study of esters of terminal dicarboxylic acids as antioxidant additives to diesel fuel. The aim of this work is the synthesis and study of asymmetric diesters, as well as complex ester of terminal dicarboxylic acids. A series of experiments was conducted on the synthesis of esters of terminal dicarboxylic acids (succinic, adipic and sebacic) with aliphatic (butanol-1, heptanol-1, octanol-1), aromatic (benzyl) and cyclic alcohols (4-methylcyclohesanol). Also, as a result of the esterification of adipic acid with ethylene glycol, a diester was synthesized, further based on it a complex ester containing 4 ester groups was obtained. The synthesized compounds were tested in the "JICAPT" apparatus in accordance with GOST 9144-79 (temperature 120 degrees C, process duration 4 hours) as antioxidants for diesel fuel. It was found that the complex ester helps prevent precipitation and asymmetric adipic esters (diheptyl octyl, dibutyl octyl and dibenzyl heptyl adipates) reduce the amount of sediment from 5.9 mg/100 ml to 0.1 mg/100 ml, 0.7 mg/100 ml and 1.5 mg/100 ml respectively. The physico-chemical characteristics of hydrofined diesel fuel with additives (dibutyl octyl, diheptyl octyl, dibenzyl heptyl and complex esters of adipic acid) and without them were studied. The results show that the synthesized complex and asymmetric esters of adipic acid can be used as additives to improve the antioxidant properties and stabilize diesel fuels