APPLICATION OF THE WATER – NEONOL AF 9-6 – SODIUM SULFATE SYSTEM FOR CLEANING USED SEMI-SYNTHETIC ENGINE OIL

The ecological problem of formation and accumulation of waste oils is considered. It has been shown that extraction processes are a promising direction for the regeneration of used oils, in particular, the direction of "green chemistry" – extraction without an organic solvent in the presence of a surfactant. The possibility of using the water – neonol AF 9-6 – sodium sulfate system for waste oil purification has been studied. The dependence of the change in the output of the formed sludge during the purification of waste oil on the temperature of the process is shown. The behavior of the system in the area of micelle densification at temperatures of 40, 55, and 60 °C. has been studied. It has been established that the optimal temperature for cleaning waste oil is 55 °C, regardless of the concentration of the reagents used. The effect of the ratio of the components of the water – neonol AF 9-6 – sodium sulfate system on the process of waste oil purification at an optimal process temperature has been studied. It is shown that the optimal composition of the water – neonol AF 9-6 – sodium sulfate system for waste oil purification contains 80 wt.% water, 15 wt.% neonol and 5 wt.% of sodium sulfate, which is confirmed by the highest sediment yield (44% by weight). The effect of the ratio of the components of the water – neonol AF 9-6 – sodium sulfate system on the number of polluting particles in purified oils has been studied. It was found that the greatest reduction in the number of polluting particles (5.5 times compared with the spent oil before cleaning) is observed in the case of using a system containing 80% by weight of water, 15% by weight.% neonol AF 9-6 and 5 wt.% sodium sulfate. For citation: Zholnerkevich V.I., Shrubok A.O. Application of the water – neonol AF 9-6 – sodium sulfate system for cleaning used semi-synthetic engine oil. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2026. V. 69. N 3. P. 57-63. DOI: 10.6060/ivkkt.20266903.6664.