| 5 tons of biomass -> 1 ton of diesel fuel|
|Biodiesel has come under great pressure.|
Biodiesel should actually be called 'rapeseed oil methyl ester' (see above). Its environmental friendliness has been debated recently. In principle, this fuel is obtained from renewable raw materials which, as they grow, consume just as much carbon dioxide as is produced during combustion. But there are concerns about the relatively poor efficiency. With the current high demand due to increased crude oil prices, long export routes are worthwhile, the energy consumption of which must also be taken into account. The earning potential e.g. for palm oil, a possible raw material for the production of biodiesel, is sometimes so tempting for developing countries that forests are cleared and humans and animals are deprived of their habitat. This is exactly the opposite of what is actually supposed to be achieved through the use of biodiesel.
|Too little space, high subsidies, dangers from fertilization|
The production of biodiesel with around 1% in Germany (2004) is not the solution to our environmental problems. There is not enough cultivation area available to generate a significant proportion of the fuel requirement. If biodiesel is supposed to be 10% in the diesel fuel according to EU plans, this will only be possible with import with the current processes and areas. In addition, just like other fuels, 20% fossil energy is needed to produce biodiesel. The subsidies for the farmers are very high. The loss of income for the state will be somewhat mitigated in 2006 by a mineral oil tax of 15 cents per liter imposed by the EU. Biodiesel cannot yet compete with the current oil price. In addition, nitrogen fertilization in agriculture may produce nitrous oxide, which is even more harmful to the environment than carbon dioxide. The use of energy for the production of biodiesel still has to be reduced.
|Relatively easy conversion, exhaust gas advantages|
The conversion work, e.g. to protect the line materials, is limited or is carried out by the manufacturer for a small surcharge. There is some underperformance and no sulfur compounds. In general, the emissions (particles, CH and HC) are generally lower. It also contains oxygen, which is an advantage for the cleanest possible combustion in the engine.
|Manufacturer approval is a problem.|
Like brake fluid, biodiesel is hygroscopic and acts like a solvent on painted surfaces. Operation with biodiesel must be expressly approved by the manufacturer, otherwise there is no guarantee in the event of damage, e.g. to the injection system, and this can be expensive. Operation with pure biodiesel is not always unproblematic - not only in winter - with vehicles of the newer diesel generation, even if they have manufacturer approval. For this reason, VW, for example, has withdrawn its approval and retrofitting options and has recently even banned the use of this fuel. Anyway, caution is advised when operating summer biodiesel in winter. At low temperatures it is advisable to fill up or mix in normal diesel fuel or at least to start with diesel. The cetane number is higher, but the calorific value is slightly lower. This can mean up to 8% more consumption.
|Well suited for admixture in a manageable percentage|
Biodiesel definitely has a future, as it is already being mixed with normal diesel fuel up to a maximum of 5%. It makes us less dependent on imported oil, promotes domestic agriculture and probably also protects the climate. The production and use of biodiesel increase the acceptance of synthetic fuels, which are much more promising in terms of efficiency.
Unfortunately, hemp and the coca bush (for cocaine) do not always grow under the same conditions as rapeseed, otherwise one could also help the farmers in coca-growing areas with the production of biodiesel without promoting drug addiction.
The cultivation areas of this world would currently (2007) perhaps be sufficient to operate all existing road vehicles. But then we would have a very unequal distribution of countries with benefits and burdens and ...... nothing more to eat.
The processing of biomass, in which only 1 ton of fuel is produced from 5 tons of biomass, has to be increased considerably in favor of more yield.
Biodiesel is relatively unsuitable for modern diesel engines with particle filters. Also, not all parts of the plant are recycled, which is better with Sun Fuel.