Biodiesel is a fuel produced by biological resources different from petroleum.

Biodiesel can be produced from vegetable oils – soy, rapeseed, and sunflower as well as from animal fats and it is used in automobile and other engines.

It is considered as the most perspective and ecologically clean fuel. Biodiesel improves the work of the engine, increasing its power, it does not contain sulphur and reduces the fuel consumption. Biodiesel can be used as pure biodiesel (indicated B100) or it could be mixed with mineral diesel at different ratios and it is suitable for the majority of the modern diesel engines. From 2012 the Bulgarian legislation provides a minimum volume of 6% biocomponent  (indicated B6).

There are two principle approaches for biodiesel production.

A. The first relies on several consecutive chemical treatments of the initial raw oil. During these, ethyl or methyl esters of the fatty acids are produced. The chemical process is always connected with the production of glycerine and of other by-products. The quality of the that glycerine is low and it should be neutralized, as it is pollutant.

To avoid the described problems oil-based biofuel could be used by technology B.

B. In the second approach physiochemical and physical processing of the feedstock is being used. It does not require special stationary installation. It does not involve processes using toxic chemical reagents. This technology is used to produce biofuel only and it there are no pollutant by-products.

tech specs (PDF)