PREDICTION OF CETANE NUMBER OF BIODIESEL FUEL FROM THE FATTY ACID METHYL ESTER (FAME) COMPOSITION

Cetane number is an important parameter in evaluating the quality of biodiesel fuel. Its determination is usually arduous and expensive, and the results obtained are not always accurate due to experimental error. This work is aimed at deve- loping a relationship between the fatty acid methyl ester (FAME) composition and the cetane number (CN). Data were collected from the literature on the cetane number of various biodiesel fuels and their FAME composition. A regres- sion analysis was performed on pure FAME to establish a rela- tionship between the cetane number and FAME composition. An equation was developed relating the cetane number with the % composition by weight of FAME of biodiesel fuel. The pre- dicted cetane number values compare well with the average measured cetane number values. This work establishes the general dependence of cetane number on FAME composition of biodiesels.

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