Rancimat vs. rapid small scale oxidation test (RSSOT) correlation analysis, based on a comprehensive study of literature

Bär, Ferdinand; Knorr, Markus; Schröder, Olaf; Hopf, Henning; Garbe, Thomas; Krahl, Jürgen

doi:10.1016/j.fuel.2021.120160

Cited by 14 publications

(7 citation statements)

References 45 publications

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“…The correlation between PetroOxy and Rancimat induction times is very strong for this limited data set (Figure ), something that has been observed in previous studies , with small sets of related samples. However, the methods are not strongly correlated when data from multiple studies and diesel/biodiesel samples are included . This is believed to be caused by biodiesel containing different antioxidants oxidizing at different rates in the two tests.…”

Section: Resultsmentioning

confidence: 99%

Properties That Potentially Limit High-Level Blends of Biomass-Based Diesel Fuel

McCormick,

Fioroni,

Naser

et al. 2024

Energy Fuels

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While today's biomass-based diesel fuels are used at relatively low blend levels in petroleum diesel, decarbonization of the heavy-duty trucking and off-road sectors is driving increasing use of higher level blends and the combination of hydroprocessing-derived renewable diesel (RD) with biodiesel (fatty acid methyl esters) to create a 100% renewable fuel. However, little data are available on the properties of biodiesel blends over 20 vol % into RD or conventional diesel, despite the potential for properties to fall well outside the normal range for diesel fuels. Here, we evaluate the properties of 20−80% blends of a soy-derived biodiesel into RD and petroleum diesel. Properties measured were flash point, cloud point, cetane number, surface tension, density, kinematic viscosity, distillation curve, lower heating value, water content, water solubility in the fuel, lubricity, and oxidation stability. Density and viscosity were measured over a wide temperature range. A key objective was to reveal properties that might limit blending of biodiesel and any differences between biodiesel blends into RD versus petroleum diesel and to understand research needed to advance the use of high-level blends and 100% renewable fuel. Properties that may limit blending include the cloud point, viscosity, distillation curve, and oxidation stability. Meeting cloud point requirements can be an issue for all distillate fuels. For biodiesel, reducing the blend level and use of lower cloud point hydrocarbon blendstocks, such as No. 1 diesel or kerosene, can be used in winter months. Alternatively, a heated fuel system that allows for starting the vehicle on conventional diesel before switching to pure biodiesel (B100) or a high-level blend has been successfully demonstrated in the literature. Some biodiesels can have kinematic viscosity above the upper limit for diesel fuels (4.1 mm 2 /s), which will limit the amount that can be blended. Biodiesel boils in a narrow range at the very high end of the No. 2 diesel range. Additional research is needed to understand how the high T90 of B100 and high-level blends and the very low distillation range of B100, some RD samples, and high-level biodiesel blends impact lube oil dilution, engine deposits, and diesel oxidation catalyst light-off. Blending with No. 1 diesel or kerosene or biodiesel-specific engine calibrations may mitigate these issues. Oxidation stability of higher level blends is poorly understood but may be addressed through the increased use of antioxidant additives. Finally, high-level biodiesel blends and B100 will have significantly higher density, viscosity, and surface tension compared to conventional diesel. In combination with the high boiling point, these properties may impact fuel spray atomization and evaporation, and additional research is needed in this area.

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Section: Resultsmentioning

confidence: 99%

Properties That Potentially Limit High-Level Blends of Biomass-Based Diesel Fuel

McCormick,

Fioroni,

Naser

et al. 2024

Energy Fuels

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“…The compressed air directs the by-products to a second container filled with deionized water where there is an electrode to measure its electrical conductivity. The sample oxidation promote water conductivity variation and indicate when the oxidative process start, time expressed in hours that represents the test method result [43], [44].…”

Section: Accelerated Oxidation Testmentioning

confidence: 99%

Aplicação de Chalconas e Análogos com Aditivos Antioxidantes em Misturas de Diesel e Biodiesel

Faria¹,

Oliveira²,

Duarte³

et al. 2022

Blucher Engineering Proceedings

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The fossil fuels are precursors of a large share of pollutants gas emissions into atmosphere. Thus, there is a growing demand for renewable and less polluting energy sources. The biodiesel represents a promising alternative for Brazilian and global energy matrices diversification as well as for reducing the environmental impacts of internal combustion engines. However, the biodiesel using can generate some technical problems associated with its lower stability and greater susceptibility to degradation in relation to petroleum diesel. As an alternative to the aforementioned problems, additives improve the physicochemical properties maintenance for biodiesel and its blends with mineral diesel, during storage and transport operations. This work includes the structural, energetic and reactional analysis associated to a chalcone molecule that presented a potential application as additive for diesel/biodiesel blends. Stability tests of S10 B20 diesel blended with C18H18O4 chalcone, during storage for 140 days, indicated an increase of up 50% in the accelerated oxidation stability time by modified Rancimat test method in relation to lower concentrations of same compound, according to data extracted from literature. The GAP, calculated from HOMO and LUMO energy also indicate high reactional stability for C18H18O4, confirming its antioxidant potential and being in accordance with some information for other antioxidant compounds, recommended like fuel and oils antioxidant additives. The results also indicated antibacterial activity associated to C18H18O4 chalcone.

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“…Neverthe vegetable oil literature shows that singlet oxygen and the associated Schenck-Ene can occur during oil rancidity [13]. Triplet-oxygen-based peroxidation starts wit cal, which is formed by allylic and bis-allylic components, which have a lower C dissociation energy [14]. Moreover, the radicals of these components are stabilized ther double bonds and thus, by mesomeric boundary formulas.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Kinetics of Neat Methyl Oleate and as a Blend with Solketal

Türck

Schmitt²,

Anthofer³

et al. 2023

Energies

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The complexity of biodiesel aging has shown that the mechanism needs further research. The rate of aging product formation and associated interactions can help improve fuel quality. Since biodiesel is a multicomponent system and constant changes occur in the chemical environment, which interactions yield which products must be shown in more detail. Particularly under observation was the correlation between peroxides and epoxides. In addition, it is critical that the influence and interactions of new drop-in fuel candidates be investigated. In this work, the kinetics of the formation of aging products of methyl oleate (C18:1) are studied. The aim was to reduce the complexity in order to be able to make more precise and detailed statements about the mechanism. Ketones, acids, peroxide, and epoxide values were recorded. A distinction is made between pure methyl oleate and mixtures with 3 wt% isopropylidene glycerine (solketal). After solketal decomposed in the blends, the aging process showed changes. The influence of solketal resulted in a higher number of acids and epoxides over time. It implied that peroxides are not necessarily the precursor of epoxides. In summary, correlation and solketal’s influence showed that a sequence of aging products could be detected.

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Rancimat vs. rapid small scale oxidation test (RSSOT) correlation analysis, based on a comprehensive study of literature

Cited by 14 publications

References 45 publications

Properties That Potentially Limit High-Level Blends of Biomass-Based Diesel Fuel

Properties That Potentially Limit High-Level Blends of Biomass-Based Diesel Fuel

Aplicação de Chalconas e Análogos com Aditivos Antioxidantes em Misturas de Diesel e Biodiesel

Oxidation Kinetics of Neat Methyl Oleate and as a Blend with Solketal

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