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fuel made from natural, renewable sources, such as new and used vegetable oils and animal fats, for use in a diesel enginediesel engine,
type of internal-combustion engine invented by the German engineer Rudolf Diesel and patented by him in 1892. Although his engine was designed to use coal dust as fuel, the diesel engine now burns fuel oil.
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. Biodiesel has physical properties very similar to petroleum-derived diesel fuel, but its emission properties are superior. Using biodiesel in a conventional diesel engine substantially reduces emissions of unburned hydrocarbons, carbon monoxide, sulfates, polycyclic aromatic hydrocarbons, nitrated polycyclic aromtic hydrocarbons, and particulate matter. Diesel blends containing up to 20% biodiesel can be used in nearly all diesel-powered equipment, and higher-level blends and pure biodiesel can be used in many engines with little or no modification. Lower-level blends are compatible with most storage and distribution equipment, but special handling is required for higher-level blends.

Biodiesel is made from oils or fats, which are hydrocarbons. Fresh soybean oil is most commonly used, although biodiesel can be made from mustard seed oil or waste vegetable oil (such as used oil from restaurant deep fryers). These hydrocarbons are filtered and mixed with an alcohol, such as methanol, and a catalyst (sodium hydroxide or potassium hydroxide), resulting in a chemical reaction whose major products are the biodiesel fuel and glycerolglycerol,
or 1,2,3-propanetriol
, CH2OHCHOHCH2OH, colorless, odorless, sweet-tasting, syrupy liquid. Glycerol is a trihydric alcohol. It melts at 17.
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Biodiesel benefits the environment because the crops used to make biodiesel take in carbon dioxide when they grow, biodiesel is considered a renewable fuel.
Biodiesel is a biological equivalent of petroleum diesel.
Staff members have access to mapping software linked to a data base of retail outlets carrying biodiesel.
In agriculture-heavy areas in particular, a biodiesel infrastructure could be coming together if oil prices remain aloft, thus ensuring that buyers of such engines have access to fuel.
Upon completion, the facility will be one of the world's first biodiesel production plants to be fully integrated with a soybean processing plant.
The biodiesel people have found a way to reduce the viscosity of vegetable oil in cold temperatures by chemically altering the molecules of the fat in the oil.
Biodiesel emits 78 percent less carbon dioxide (CO2) emissions than petroleum diesel, according to the National Biodiesel Board, but it's not necessarily squeaky green.
In the last few years, many farmers, environmentalists and other renewable energy advocates have begun promoting biodiesel as an alternative fuel that could replace at least a portion of the world's petroleum-based diesel fuel market.
Biodiesel production typically begins with vegetable oil and an alcohol.