article · ACS Omega
Biodiesel is a clean energy source, but its quality must be verified through physicochemical parameters, with the cetane number being a critical indicator of ignition quality in diesel engines. This number varies based on the biodiesel's fatty acid composition, including carbon chain length and saturation levels. Standard methods for determining cetane number, such as ASTM D613 and ISO 5165, are often challenging, time-consuming, and susceptible to interference from gases. This research addresses these difficulties by presenting three alternative, more straightforward techniques for predicting biodiesel cetane number when engine-based measurements are impractical. These methods include colour indicator titration, aniline point, and fatty acid composition-based calculations. The values obtained from these alternative procedures meet the minimum cetane number requirements for biodiesel and show only minor differences compared to standard methods.
Accurately determining biodiesel's cetane number is crucial for ensuring fuel quality and engine performance. By offering simpler, more accessible measurement methods, this research can help overcome practical barriers to quality control, potentially supporting wider adoption and consistent production of biodiesel.
This research offers practical alternative methods for assessing biodiesel quality, which could be adopted by biodiesel producers, quality control laboratories, and researchers. These techniques enable easier and faster determination of cetane number, reducing reliance on expensive and complex engine-based tests. The methods appear ready for application in quality assurance processes for biodiesel products, as they meet established industry standards and show minimal variation from conventional approaches.
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Biodiesel is an environmentally beneficial and clean energy source that may replace fossil fuels, which are detrimental to the environment and cannot be replenished. Therefore, the physicochemical parameters of biodiesel must be determined in order to verify its quality. The cetane number is a crucial dimensionless fuel property that gauges the fuel ignition quality in power diesel engines. A higher cetane number results in a shorter ignition delay time, and vice versa. Biodiesel's cetane number may fluctuate due to a variety of fatty acid compositions, including variations in carbon chain length and the degree of unsaturation. The cetane number generally increases with increasing saturation and chain length, while it decreases as chain length is reduced and degrees of unsaturation and branching increase. This is the main reason for why alkanes possess a higher cetane number than alkenes and aromatics. The standard protocols for evaluating the cetane number of biodiesel are ASTM D613 and ISO 5165 test techniques using a monocylindrical cetane engine. However, adhering to these conventional procedures is quite challenging and time-consuming, and the cetane number test result may also be affected by the presence of certain gases and fumes. As a result, many researchers are bothered with cetane number valuation, and occasionally they skip it due to a lack of other options. Consequently, the aim of this paper is to present a set of more straightforward and relevant alternative techniques that can be applied to predict the cetane number of biodiesel when engine-based measurement is not practical. The three techniques with their designed pictographic outlooks conferred in this article include color indicator titration, aniline point, and fatty acid composition-based methods. The reported values of these procedures meet the minimum cut point of the biodiesel cetane number required by ASTM D6751 (≥47) and exhibit minimal variation from the typical standard methods. Nevertheless, the above-mentioned techniques are not applicable to other alternative biofuels except biodiesel products because they have a direct implication on the characteristics of the fatty acid profiles of different oil precursors, such as carbon chain length, degree of saturation or unsaturation, and aromaticity, which make up monoalkyl esters.
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DOI: 10.1021/acsomega.3c09216
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