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dc.contributor.advisorBaytekin, Hasan Tarık
dc.contributor.authorAshirov, Timur
dc.date.accessioned2017-07-10T07:40:52Z
dc.date.available2017-07-10T07:40:52Z
dc.date.copyright2017-06
dc.date.issued2017-06
dc.date.submitted2017-06-23
dc.identifier.urihttp://hdl.handle.net/11693/33375
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (M.S.): Bilkent University, Department of Materials Science and Nanotechnology, İhsan Doğramacı Bilkent University, 2017.en_US
dc.descriptionIncludes bibliographical references (leaves 1-8).en_US
dc.description.abstractOils are one of the mostly used lubricants in industry. Chemical oxidation, however, causes depletion of additive materials i.e. antioxidants in lubricants and their usage life time shortens. This causes varnish and sludge problems and leaves behind tons of used oil that loses its functionality. It is reported that more than 600 tons of lubricating oil can be reclaimed from 1000 tons of used oil. One of the reclamation methods is caustic extraction, and has been known for more than 3 decades. Although caustic extraction has a very high potential because of its economic considerations, this method is not fully understood due to lack of research. We have revealed that opposite to the common belief, oxidized oils (used oils) have ester groups in contrary to carboxylic acids. Magnetic nanoparticles (Fe3O4) can be used as a catalyst for hydrolysis of various esters. We have investigated the effect and mechanism of caustic extraction in combination with magnetic iron oxide nanoparticles. Using sodium hydroxide, breaks ester bonds by forming carboxylate salts and alcohols. These carboxylate salts are transferred into water and can be removed by water. Formed alcohol groups can be trapped by drying agents like MgSO4. Further purification of reclaimed oils can be achieved using hexane or similar low molecular weight and inexpensive solvents. According to our results, properties of recovered base oils mostly compete with petroleum based and ester-based synthetic base oil properties.en_US
dc.description.statementofresponsibilityby Timur Ashirov.en_US
dc.format.extentxii, 81 leaves, 15 leaves : illustrations, charts (some color) ; 29 cmen_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectUsed lubricantsen_US
dc.subjectUsed oilen_US
dc.subjectMagnetic nanoparticlesen_US
dc.subjectCaustic extractionen_US
dc.subjectOil reclamationen_US
dc.titleReclamation of used lubricating oils using magnetic nanoparticles and caustic sodaen_US
dc.title.alternativeKullanılmış kayganlaştırıcı yağların manyetik nanoparçacıklar ve kostik soda kullanılarak geri kazanılmasıen_US
dc.typeThesisen_US
dc.departmentGraduate Program in Materials Science and Nanotechnologyen_US
dc.publisherBilkent Universityen_US
dc.description.degreeM.S.en_US
dc.identifier.itemidB155872
dc.embargo.release2017-09-21


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