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Biodiesel Fuel Specifications: A Review

This article is a literature review on biodiesel fuel specifications. Various methods were also studied by researchers in the production of biodiesel. The study is focused on the fuel specifications of alkali catalyst transesterified biodiesels from different raw materials, and it is based on the reports of more than 60 scientists who published their results previously. Studies are continuing to find out the best quality esters under different transesterification circumstances. Changing the production conditions makes the fuel specification results variable. While production, performance, and emission study reviews are available in the literature, there is no review on biodiesel fuel specifications based on detailed raw materials. It is thought that a literature review on fuel specifications will make a contribution to the literature on alkali-transesterified biodiesel fuels of different raw materials. Fuel specifications that are commonly concluded, such as density, viscosity, cetane number, cold flow properties, flash point, and calorific value, were examined and reviewed from published articles. It is also found that more than 85% of published papers don't include extensive fuel quality reports according to ASTM 6751 and EN 14214.