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ARPN Journal of Science and Technology >> Volume 7, Issue 2, November 2017

ARPN Journal of Science and Technology

Re-refining of Used Lube Oil, II- by Solvent/Clay and Acid/Clay-Percolation Processes

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Author Eman A. Emam, Abeer M. Shoaib
ISSN 2225-7217
On Pages 1034-1041
Volume No. 2
Issue No. 11
Issue Date January 01, 2013
Publishing Date January 01, 2013
Keywords Re-refining used oil; Base oil; Solvent extraction; Clay-percolation; Acid treatment


Used oils are lubricating oils which have become unsuitable for their proposed use. They may be recycled through the use of re-refining process to achieve useful products. This study compares two different re-refining processes. A laboratory scale setup of solvent extraction/clay and acid/clay-percolation processes were established to re-refine used oil collected from different sources. A comparison of its product characteristics with virgin base oil and with Egyptian standard regeneration lubricating oil characteristics is introduced. The results showed that, pour point increased from -15C for feed oil to -2C for acid/clay-percolation process and -6C for solvent/clay process. This is compared with -8C for virgin base oil. Sulfur content was found about 0.42wt% for acid/clay-percolation and 0.81 wt% for solvent/clay. In general, a best quality of the re-refined base oil using acid/clay-percolation was obtained and nearly meets the Egyptian standards. On the other hand, a higher yield of about 83% using solvent extraction/clay treatment was achieved.

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