Abstract
Waste lubricant oil can be regenerated by solvent extraction and flocculating agent to get rid of impurities. In this paper, butanol was selected as an extractant, and monoethanolamine (MEA) as a flocculating agent. The aim of the work was to identify the best refining conditions to separate base oil suitable for the formulation of new lubricants and avoid the coextraction of impurities. The effects of time, temperature, solvent/waste oil mass ratios, and flocculant concentration on the separation efficiency and yields were investigated. Optimization conditions of the refining were obtained by experiments: refining time = 20 min, temperature = 30 °C, solvent/waste oil mass ratios = 5g/g, flocculant concentration = 2g/kg solvent. When comparing i-butanol/MEA and n-butanol/MEA, it was found that yields obtained with composites of i-butanol/MEA were slightly higher than those obtained with n-butanol/MEA. On the other hand, because MEA not only agglomerates waste oil contaminants but also reduces the dosage of solvent, the solvent/waste oil mass ratios at which stabilization occurs with composite butanol/MEA were smaller than that obtained with single pure solvent (n-butanol, i-butanol). Under composite refining, metallic and oxidation compound removal was very efficient, and the properties of the recovered oil were notably improved than that in the original waste oil. The recovered oil was almost similar to a HVI150 virgin oil and, therefore, suitable for the formulation of new lubricant oil.
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