Biodiesel is a mixture of fat acids and short chain esters, with fatty acid methyl esters of 15-18 carbon
atoms being the major ingredient. It has excellent fuel properties, the ability to start an engine at a low
temperature, good lubricating properties ,safety performance, and low sulfur content, which leads to a
30% or so reduction of carbon dioxide and sulfide emissions; what’s more, it does not contain
environmentally harmful aromatic alkanes, and the exhaust gas from biodiesel is less poisonous to the