Vegetable oils like rapeseed oil make good fuels but they can't be burned directly in engines.
The oils must be converted into biodiesel first.
This involves reacting them with methanol, using a strong alkali catalyst such as potassium hydroxide or sodium hydroxide.
You get a mixture of methyl esters of fatty acids - this us biodiesel.
http://www.esru.strath.ac.uk/EandE/Web_sites/06-07/Biodiesel/biodiesel/equation.jpg
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