Effect of the experimental conditions on the thermooxidative behaviour of vegetable oils

Buzás, I.; Simon, J.; Holló, J.

doi:10.1007/bf01909598

Cited by 26 publications

(13 citation statements)

References 5 publications

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“…Surprisingly, we have encountered only a few papers dealing with DSC or DTA study of the oxidation of oils or fats (9)(10)(11)(12)(13)(14). To our knowledge, no paper has been published on the thermoanalytical study of biodiesel fuels.…”

mentioning

confidence: 82%

Oxidation stability of methyl esters studied by differential thermal analysis and rancimat

Polavka

Paligová

Cvengroš

et al. 2005

J Americ Oil Chem Soc

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The oxidation stability of methyl esters derived from fresh rapeseed oil and waste frying oil, used as alternative biodiesel fuels, both distilled and undistilled, unstabilized and stabilized by pyrogallol and BHT, was studied by differential thermal analysis (DTA) under nonisothermal conditions at various heating rates and by the Rancimat test under isothermal conditions at 110°C. The results obtained by both techniques are compared. Both techniques show that oxidation stability increases considerably with the addition of antioxidants and that pyrogallol is very efficient. Distillation of the methyl esters prepared from rapeseed oil decreases their oxidation stability, obviously owing to the removal of natural antioxidants. The stability of methyl esters prepared from the waste frying oil is determined mainly by the history of the oil. From the DTA measurements, the kinetic parameters of an Arrhenius-like equation describing the temperature dependence of the oxidation induction period were obtained. The parameters enable one to assess the protective factor of antioxidants for temperatures outside the measuring region, estimate the residual stability, and model the process of biodiesel oxidation under nonisothermal conditions.

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mentioning

confidence: 82%

Oxidation stability of methyl esters studied by differential thermal analysis and rancimat

Polavka

Paligová

Cvengroš

et al. 2005

J Americ Oil Chem Soc

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“…Also, they are superior in dissolving contaminants and additives than mineral oils [10]. Plant oils are derived from a renewable source, but it has some disadvantages such as poor thermooxidative stability [23] which oxidizes at a faster rate than mineral oils [24] and that is due to presence of fatty acids [25][26][27][28][29][30]. Fig.…”

Section: Researchmentioning

confidence: 99%

Eco-friendly Multifunction Petroleum Additives: Preparation, Characterization and Evaluation

Abo-Hatab¹,

Kandile²,

Salah³

2018

Tribol. Ind.

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“…Among their disadvantages [7][8][9] are their relatively high pour points [10] and their low thermaloxidative stability [11].…”

Section: Introductionmentioning

confidence: 99%

Mixtures of vegetable oils and di-2-ethylhexyl-sebacate as lubricants

Puscas

Bandur

Modra

et al. 2006

J. Synthetic Lubrication

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Lubricants based on vegetable oils are growing in popularity in various applications. Environmentally friendly, vegetable oils and their derivatives constitute alternatives to mineral-based lubricants. Soybean oil, sunflower oil and rapeseed oil have better viscosity indices than mineral oils and even some synthetic oils, are biodegradable and have low production costs. However, vegetable oils have disadvantages, such as poor thermo-oxidative stability due to the carbon-carbon double bonds and poor low-temperature properties, which limit their use as lubricant base stocks. This study describes new base-stock oils obtained from mixture of vegetable oils and di-2-ethylhexyl-sebacate synthetic oil, which become lubricants when additives are introduced. These mixtures offer a large range of kinematic viscosities, while their pour points are under −33°C and their flash points over 240°C. The copper strip corrosion test result is 1a. The diameters of wear scars measured under four-ball testing (40 dyn) are less than 1 mm. A differential scanning calorimetry study and a thermo-gravimetric study under a nitrogen atmosphere for the mixed oils are reported. In the former study two-endothermic processes were observed between −15°C and −50°C. In the thermo-gravimetric analysis curve the weight loss is specific for each vegetable and synthetic oil component. From these studies a higher thermal stability was observed for vegetable oils than for ester oils, and it was concluded that the mixtures of vegetable and synthetic oils of diester type are physically homogeneous mixtures. The low production cost of lubricants based on vegetable oils makes them attractive alternatives for mineral oil based lubricants. Overall the mixtures of vegetable and ester oils can be competitive base oils for environmentally friendly lubricants.

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Effect of the experimental conditions on the thermooxidative behaviour of vegetable oils

Cited by 26 publications

References 5 publications

Oxidation stability of methyl esters studied by differential thermal analysis and rancimat

Oxidation stability of methyl esters studied by differential thermal analysis and rancimat

Eco-friendly Multifunction Petroleum Additives: Preparation, Characterization and Evaluation

Mixtures of vegetable oils and di-2-ethylhexyl-sebacate as lubricants

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