General Interest

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Biodiesel operates in conventional engines. Just like petroleum diesel, biodiesel operates in combustion-ignition engines. Essentially no engine modifications are required, and biodiesel maintains the payload capacity and range of diesel. Pure biodiesel is not compatible with natural rubber, sometimes found in pre-1994 vehicles. Because it is a solvent, it can degrade natural rubber hoses and gaskets. This is not a problem with B20 blends (20 percent biodiesel/80 percent diesel) and below. 

Biodiesel does not require special storage. In fact, in its pure form or in blends, biodiesel can be stored wherever petroleum diesel is stored, except in concrete-lined tanks. It handles like diesel and uses the same infrastructure for transport, storage and use. At higher blend levels, biodiesel may deteriorate natural rubber or polyurethane foam materials.

Biodiesel exhaust is less offensive. The use of biodiesel and biodiesel blends results in a noticeable, less offensive change in exhaust odor, which can be a real benefit in confined spaces. In fact, equipment operators have compared it to the smell of French fries. Users also report having no eye irritation. Since biodiesel is oxygenated, diesel engines have more complete combustion with biodiesel than with petroleum.

Biodiesel is safer to use than petroleum diesel. The flash point (the point at which fuel ignites) for biodiesel in its pure form is a minimum of 200 degrees versus about 125 degrees Fahrenheit for regular No. 2 diesel. This makes biodiesel one of the safest fuels to use, handle and store. 

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Biodiesel reduces emissions significantly. Biodiesel is the first alternative fuel to have fully completed the Health Effects testing requirements of the Clean Air Act. The use of biodiesel in a conventional diesel engine results in substantial reduction of unburned hydrocarbons, carbon monoxide, and particulate matter. Emissions of nitrogen oxides are either slightly reduced or slightly increased depending on the duty cycle and testing methods. The use of biodiesel decreases the solid carbon fraction of particulate matter (since the oxygen in biodiesel enables more complete combustion to CO2), eliminates the sulfate fraction (as there is no sulfur in the fuel), while the soluble, or hydrocarbon, fraction stays the same or is increased. Biodiesel works well with new technologies such as catalysts, particulate traps, and exhaust gas recirculation. Soy biodiesel reduces carbon dioxide by 78% on a life cycle basis. 
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Biodiesel improves domestic energy security. By using domestically produced, renewable fuels like biodiesel, the United States can reduce dependence on foreign countries for oil. Biodiesel has the highest energy balance of any domestic renewable fuel, further increasing its value in our energy portfolio. Every unit of fossil fuel it takes to make biodiesel results in 3.67 units of energy gain. Since petroleum diesel has a negative energy balance of .88, every gallon of biodiesel used has the potential to extend our petroleum reserves by over four gallons.

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 Featured User

Yellowstone National Park

Biodiesel powers about 300 vehicles, boilers, and other diesel equipment at the world's first and most famous National Park - Yellowstone. The park manages to gracefully handle 2.5 million annual visitors. One thing that helps protect the park from pollution is the use of B20.

Jim Evanoff, the Environmental Manager for Yellowstone, has been a leader in biodiesel use and education for more than a decade. It was in 1996 that he began using biodiesel in one of the park's vehicles (which he still drives), and now Yellowstone's entire diesel fleet operates on biodiesel.

'Our diesel vehicles run great on B20 all year," Evanoff said. "Even during our coldest days, the vehicles have started fine."

In 2006, the biodiesel industry recognized his commitment. At the National Biodiesel Conference & Expo in San Diego, the National Biodiesel Board presented Evanoff with the “Inspiration Award.”

“As stewards of the country's first national park, it is our duty and responsibility to preserve and protect this national treasure," Evanoff said. "By using this biodegradable, renewable fuel in the park's sensitive environment, we are practicing a high level of sustainability that other national parks around the country have followed."

The park is also home to biodiesel pumps for the public.