Used Lubricating Oils Re-Refining by Solvent Extraction
[1]
M. Hussein, Department of chemical Engineering, Alexandria University, Alexandria, Egypt.
[2]
A. A. Amer, Department of Used Oil Re-refining, Alexandria Petroleum Company, Alexandria, Egypt.
[3]
A. S. Gaberah, Department of chemical Engineering, Alexandria University, Alexandria, Egypt.
The objective of this work is to investigate the re-refining of used lubricating oils using solvent extraction process Experiments were carried out on used oils collected from several service stations. Used oils were subjected to solvent extraction of base oil using different classes of solvents including alcohols (i.e. methanol, 1- propanol, butyl alcohol and iso-butanol), ketones (i.e. acetone and methyl ethyl ketone) and hydrocarbon solvent (i.e. Hexane) to pre-select suitable solvents. Bench scale study was carried out to investigate the effect of different variables including mixing time, mixing speed, settling time and temperature. Extraction processes were carried out using butyl alcohol, 1-propanol, and acetone. The results obtained indicate that extraction with butyl alcohol gives the highest extraction yield of 93.4% with high impurities at room temperature, followed by 1-propanol where the extraction yield was 90.7% but at higher mixing time, mixing speed and temperature. An extraction yield of 51% was obtained by acetone. The extracted base oils were analyzed to determine the effect of solvent on the metallic and sulfur content. It was found that the metallic content of the extracted base oil by acetone is the lowest followed by butyl alcohol. On the other hand, the sulfur content of the extracted oil by butyl alcohol was lower than that using acetone.
Used Lubricating Oils, Waste Lubricating oils, Re-Refining ,Recycling, Solvent Extraction
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