Synthesis of mixed dietylene glycol diester based on the natural petroleum acid

Abstract

The paper is dedicated to the synthesis of mixed diester of dietylene glycol with high yield based on the natural petroleum and pentanoic acids using ZnO catalyst aiming the increase of plasticizer and antioxidant sorts. To define the optimum conditions for obtaining mixed diester with high yield, the reactions in the presence of ZnO catalyst of various quality have been carried out in the certain ratio components included in the reaction and temperature intervals. The optimum conditions, i.e. catalyst amount in 1.5 % mass regarding to the acid, molar ratio of the components alcohol: acid - 1.5:2, the temperature 130–140 oC in the highest yield of 92 % have been selected. The physical-chemical indexes of synthesized ester have been specified and material balance of obtainment process showed. For the improvement of thermal-oxidizing steadiness of diesel fuels, diester of diethylene glycol was tested and justified that by adding 0.004 % mass of mixed diester into the diesel fuel, thermal-oxidizing steadiness significantly increases.