gallick,
hope this is of some help.
Biodiesel
Traditional diesel is produced from mineral crude oil. Biodiesel is produced from a variety of vegetable oils, including but not limited to rape, canola, soy, linseed, palm, coconut, mustard and cotton oils. It can also be manufactured from tallow oil and yellow grease (used cooking oils).
Biodiesel has emerged as a realistic and desirable alternative, or blended addition, to mineral diesel and is becoming an increasingly valuable contributor to the worlds response to greenhouse gas emissions. It has been in general pure use for the last 10 years in continental Europe. However, the majority of the UK biodiesel produced is expected to be used as a 5 per cent. blend with mineral diesel. As an additive to ULSD a blend of biodiesel will restore lubricity, lost due to the reduction of sulphur compounds, as well as adding environmental benefits.
Advantages of biodiesel include the following:
Negligible sulphur content;
Zero aromatic content (toluene and benzene);
Comparable energy and power content;
Flash point of 300oF against 137oF for mineral diesel;
Significant reduction in particulates (soot) and hydrocarbons;
70 per cent. reduction of carbon monoxide emissions in diesel exhausts;
Non toxic and biodegradable; it is fully degraded from a waterway environment within approximately 20 days; and
Significant lubricant characteristics enabling a reduction in wear and extended efficiency for injectors, for all engines using ULSD, hence resulting in lower maintenance costs
http://www.biofuelscorp.com/biodiesel.htm
wilbs