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: Biodiesel as an Alternate Fuel



From: Andy Soos, ENN
Published February 10, 2010 09:18 AM

Biodiesel as an Alternate Fuel

Biodiesel refers to a vegetable oil or animal fat based diesel fuel consisting of long chain alkyl is typically made by chemically these oils with an alcohol. Biodiesel is meant to be used in standard diesel engines and is thus distinct from the vegetable and waste oils used to fuel converted diesel engines. Biodiesel can be used alone, or blended with petrodiesel.

There was a recent White House’s announcement calling for expanded production of biofuels (36 billion gallons by 2022 to be exact). But more biofuels is only part of the equation when it comes to reducing greenhouse gas emissions and our reliance on petroleum carbon based fuels. Vehicles must be ready and sometimes converted to this usage. Enterprise Holdings just announced that it will convert its entire fleet of Alamo Rent A Car, Enterprise Rent-A-Car and National Car Rental airport shuttle buses to biodiesel by spring of this year. That’s more than 600 buses throughout more than 50 North American markets.

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A system known as the "B" factor is often used to state the amount of biodiesel in any fuel mix.  For example fuel containing 20% biodiesel is labeled B20, while pure biodiesel is referred to as B100.

Biodiesel can also potentially be used in some boilers or furnaces as a heating fuel in domestic and commercial boilers. In some cases there may be addtional maintenance issues.

EPA studied biodiesel air emissions and concluded that that unburned hydrocarbons, particulate matter and carbon monoxide are all significantly reduced. On average a B100 fuel would have 67% less unburned hydrocarbons and 47% less particulates as air emissions.

Starting immediately, Enterprise will use at least B5 (5 percent biodiesel) in all of its shuttle buses, with a higher concentration of biodiesel, B20, being used in nine markets (Boston, Chicago, Denver, Detroit, Los Angeles, Miami, Raleigh/Durham, San Diego and San Antonio). The company plans to extend the B20 blend to the remaining markets over the next five years, with 50 percent of the change over complete by the end of next year.

The carbon reduction in the first year of using biodiesel in the shuttle buses will be the equivalent of retiring 40 buses from Enterprise’s fleet. It will also reduce use of petroleum diesel by about 420,000 gallons in the first year.


The company announced its biodiesel conversion plans at the National Biodiesel Board (NBB) 2010 National Biodiesel Conference & Expo in Dallas.

For further information: http://en.wikipedia.org/wiki/Biodiesel or http://www.keystogreen.com/

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