Base oil recovery from waste lubricant oil by polar solvent extraction intensified by ultrasound

This paper proposes a greener approach to the intensification of base oil recovery for truck engines (32,500 km of use) using ethanol, propan-2-ol, 2-methylpropan-1-ol, and butan-1-ol as solvents for the extraction of base oil, combining mechanical stirring (220 rpm) and ultrasound (25 °C, 24 kHz, a...

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Bibliographic Details
Published in:Environmental science and pollution research international 2021-12, Vol.28 (46), p.66000-66011
Main Authors: Lins, Tomas S., Pisoler, Gleiciane, Druzian, Gabriel T., Negris, Luana, Decote, Paulo A. P., Vicente, Maristela A., Flores, Erico M. M., Santos, Maria F. P.
Format: Article
Language:English
Subjects:
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Automotive engines
Chromium
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Ethanol
Iron
Isopropyl alcohol
Lubricants
Molybdenum
Oil recovery
Oil wastes
Research Article
Solvent extraction
Solvents
Stirring
Truck engines
Ultrasonic imaging
Ultrasound
Waste recovery
Waste Water Technology
Water Management
Water Pollution Control
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Summary:This paper proposes a greener approach to the intensification of base oil recovery for truck engines (32,500 km of use) using ethanol, propan-2-ol, 2-methylpropan-1-ol, and butan-1-ol as solvents for the extraction of base oil, combining mechanical stirring (220 rpm) and ultrasound (25 °C, 24 kHz, and 400 W). The results indicated that the recovery yields of the base oil, using the mechanical stirring and ultrasound (MS-US) system, for ethanol, propan-2-ol, 2-methylpropan-1-ol, and butan-1-ol were approximately 3.1, 25.6, 71.6, and 85.5%, respectively. By contrast, the recovery yields using only mechanical stirring were 8.8, 28.9, 58.9, and 76.1%, respectively. The system with pre-extraction could effectively remove Ca (85.3–93.0%), Mg (67.2–82.9%), Na (31.7–62.5%), and Zn (0.0–71.7%). Finally, the results showed a reduction of almost 100% for the concentrations of Al, Cr, Fe, and Mo in the pre-extraction system. The mechanical stirring (5 min) and ultrasound (5 min) system were able to intensify the extraction process using environmentally friendly solvents.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-021-15582-y