Davydenko O. Development of processes of chemical and electrochemical regeneration of worked oils

Dissertation for obtaining a scientific degree of the candidate of technical sciences (doctor of philosophy) in specialty 05.17.07 - Chemical technology of fuel and fuel and lubricants. - National Aviation University, Kyiv, 2020. The dissertation is devoted to the development of chemical and electrochemical method of regeneration of worked oils. The basic regularities of the process of preliminary preparation and the chemical stages of the regeneration process are studied. The conditions of ozonation and ozone depletion are determined. To confirm the high quality of regenerated oils obtained through successive stages of chemical treatment, determination of their physical and chemical indices for the compliance of regulatory documents with commodity and base oils. Experimental studies have shown that the most effective method for the destruction of ozonides is their oxidation decomposition hydrogen peroxide, whose products are predominantly carboxylic acids. It has been shown that the effective method of extracting salts of carboxylic acids and other oxygen-containing products is the continuous extraction with water, which ensures their effective removal, which is confirmed by the definition of physico-chemical parameters. The main regularities of the course of electrochemical reactions of cathode reduction of carbonyl compounds and anodic oxidation of carboxylic compounds were studied, on the basis of which new available and environmentally safe electrode materials with products of transformation on which hydrocarbons are proposed. The general mechanism of the process of anodic oxidation of carboxylic acids on various electrode materials is proposed and features of the influence of electrode materials on the obtained electrolysis products have been studied. Testing of the obtained regenerated oils showed their high quality, which testifies to the effectiveness of the application of the chemical and electrochemical method of regeneration of the worked oils. Key words: activated oil, oxidation, regeneration, cathode recovery, anodic oxidation, ozone, extraction, polarization curves, regenerated oil.