Oxidative and thermal instability of biodiesel

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dc.contributor.authorArisoy K.
dc.date.accessioned2024-07-22T08:22:09Z
dc.date.available2024-07-22T08:22:09Z
dc.date.issued2008
dc.description.abstractThe term biodiesel means the monoalkyl esters of long-chain fatty acids made from biolipids such as vegetable oils, animal fats, or algae. Chemical reactivity of biodiesel can be divided into oxidative and thermal instability. Many of the biolipids contain polyunsaturated fatty acid chains in that their double bonds have high chemical reactivity. The oxidative and thermal degradation occurs on the double bonds of unsaturated aliphatic carbons chains in biolipids. Oxidation of biodiesel results in the formation of hydroperoxides. The formation of the hydroperoxide follows a well-known peroxidation chain mechanism. The olefinic unsaturated fatty acid oxidation is a multi-step reaction process where primary products (conjugated diene hydroperoxides) decompose and chemically interact with each other to form numerous secondary oxidation products. The oxidative and thermal instability are determined by the amount and configuration of the olefinic unsaturation on the fatty acid chains. The viscosity of biodiesel increases with the increase of thermal degradation degree due to the trans-isomer formation on double bonds. The decomposition of biodiesel and its corresponding fatty acids linearly increases from 293 K to 625 K. The densities of biodiesel fuels decreased linearly with temperatures from 293 K to 575 K. The combustion heat of biodiesel partially decreases with the increase of thermal degradation degree.
dc.identifier.DOI-ID10.1080/15567030601082845
dc.identifier.issn15567230
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/18954
dc.language.isoEnglish
dc.subjectAcids
dc.subjectChains
dc.subjectChemical bonds
dc.subjectChemical oxygen demand
dc.subjectChemical reactivity
dc.subjectDegradation
dc.subjectEsters
dc.subjectFatty acids
dc.subjectMechanisms
dc.subjectOrganic compounds
dc.subjectOxidation
dc.subjectSulfate minerals
dc.subjectSynthetic fuels
dc.subjectThermodynamic stability
dc.subjectThermogravimetric analysis
dc.subjectVegetable oils
dc.subjectAnimal fats
dc.subjectBio-diesel fuel (BDF)
dc.subjectChain-mechanism
dc.subjectCombustion heat
dc.subjectDegradation degree (DD)
dc.subjectDouble bonds
dc.subjectFatty acid chains
dc.subjectHydroperoxide (ROOH)
dc.subjectHydroperoxides
dc.subjectLong-chain fatty acids
dc.subjectMonoalkyl esters
dc.subjectMulti-step
dc.subjectPeroxidation
dc.subjectPolyunsaturated fatty acids
dc.subjectReaction processes
dc.subjectReactivity (Chemical)
dc.subjectSecondary oxidation products
dc.subjectTrans isomers
dc.subjectUnsaturated fatty acid (UFA)
dc.subjectBiodiesel
dc.titleOxidative and thermal instability of biodiesel
dc.typeArticle

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