Katerina Swanson
Biodiesel is a renewable, biodegradable alternative fuel made from a mix of modified vegetable oils and diesel fuel. It is rarely used in its pure form, and is typically blended with diesel fuel. Biodiesel blends can be used as heating oil, and are safer to handle than diesel, eliminating the risk of environmentally hazardous fossil fuel spills. Biodiesel is also cheaper than diesel, and has the added benefit of being able to be produced at home. However, it requires the use of resources that one would otherwise consume as food, and can be tough on some components of cars, especially older engines.
Characteristics of non-bio diesel fuel:
| Characteristics | Values |
|---|---|
| Engine power | 3-5% higher |
| Fuel efficiency | 3-5% higher |
| Engine wear | Higher in the short term |
| Deposits and clogging | More likely |
| Renewable resource | No |
| Reduces tailpipe emissions | No |
| Reduces carbon monoxide emissions | No |
| Reduces particulate matter emissions | No |
| Reduces carbon dioxide emissions | No |
| Non-toxic | No |
| Biodegradable | No |
| Compatible with modern diesel engines | No |
| Compatible with older diesel engines | Yes |
| Requires modification of rubber fuel lines in older cars | Yes |
| Requires modification of fuel systems in newer cars | Yes |
| Requires use of resources meant for food | No |
| Shelf life | 2 years |
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What You'll Learn
Biodiesel is made from vegetable oils and methanol
Biodiesel is a renewable and biodegradable alternative fuel made from a mix of modified vegetable oils and diesel fuel. It is produced by combining vegetable oil with methanol in the presence of a catalyst, usually sodium hydroxide. This process, known as transesterification, was first conducted as early as 1853 by Patrick Duffy, four decades before the first diesel engine was even functional.
The use of vegetable oils for engine fuel was envisioned by Diesel himself, who, in a 1912 speech, said:
> The use of vegetable oils for engine fuels may seem insignificant today but such oils may become, in the course of time, as important as petroleum and the coal-tar products of the present time.
Today, biodiesel is rarely used in its pure form, and is typically blended with diesel fuel, with blends such as B5 (5% biodiesel, 95% diesel) and B20 (20% biodiesel, 80% diesel) being common. The blend percentage is indicated by the ""B" factor, with B100 representing pure biodiesel.
Biodiesel is a preferred fuel type for the US government due to its environmental benefits. It reduces tailpipe emissions, including soot and air toxics, and EPA research indicates that it emits 11% less carbon monoxide and 10% less particulate matter than diesel. It is also nontoxic and biodegradable, unlike petroleum diesel, which contains sulfur and carcinogenic benzene.
Making biodiesel is relatively simple, but it involves handling toxic and flammable chemicals, so caution is advised. The process involves mixing methanol with sodium hydroxide to produce sodium methoxide, which is then mixed with vegetable oil. The mixture is blended at low speed for 20 to 30 minutes, after which it is poured into a jar, where it separates into layers.
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Biodiesel is rarely used in its pure form
Pure biodiesel is fully biodegradable, with about 98% of it degrading in about three weeks. It is also non-toxic, with the cancer-causing potential of particulate matter from pure biodiesel being about 94% less than that of petrodiesel. However, B100 is seldom used as a fuel due to cost factors and availability. Engine manufacturers do not warrant their engines and components if B100 is used as fuel.
Biodiesel blends offer a compromise between the environmental benefits of biodiesel and the performance characteristics of standard diesel fuel. Biodiesel is a renewable, biodegradable alternative fuel made from a mix of modified vegetable oils and diesel fuel. Its production has increased from 25 million gallons in 2005 to 1.7 billion gallons in 2013. Today, biodiesel is blended at a rate of 5% or less into almost all the diesel fuel sold in the United States.
Biodiesel blends can be used as heating oil. The environmental impact of biodiesel is complex and varies based on factors like feedstock type, land use changes, and production methods. While it can potentially reduce greenhouse gas emissions compared to fossil fuels, concerns about biodiesel include land use changes and deforestation.
Biodiesel blends of 20% biodiesel and lower can be used in diesel equipment with no or minor modifications. However, certain manufacturers do not extend warranty coverage if equipment is damaged by these blends. The B6 to B20 blends are covered by the ASTM D7467 specification.
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Biodiesel is better for older engines
Biodiesel is a renewable, biodegradable alternative fuel made from a mix of modified vegetable oils and diesel fuel. It is the US government's preferred fuel type due to its lower emissions and the drive to reduce reliance on petroleum. Biodiesel emits 11% less carbon monoxide, 10% less particulate matter, and 78% less net carbon dioxide than diesel. It is also nontoxic, unlike petroleum diesel, which contains sulfur and carcinogenic benzene.
While biodiesel is typically blended with diesel, it can be used in existing diesel engines without modifications. Most diesel engines can be started and operated for several hours with biodiesel fuel, and some older engines may even experience fewer difficulties when using biodiesel. For example, old, indirect injection engines have shown promise for running on straight vegetable oil that has not been chemically processed into biodiesel. This indicates that older engine designs may hold clues for creating engines optimised for biodiesel use.
However, biodiesel may not be compatible with all materials used in older engines. For instance, some older engines use seals and hoses made from "Buna N" rubber, which can be dissolved by biodiesel. Therefore, it is important to check and replace these components if necessary before switching to biodiesel. Additionally, biodiesel tends to oxidise, so extra care must be taken when storing engines with biodiesel for extended periods.
Overall, biodiesel is a promising alternative fuel for older engines, especially considering the growing demand and availability of biodiesel. However, it is crucial to consult the manufacturer's recommendations and ensure compatibility with engine materials to avoid potential issues.
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Biodiesel is a solvent
Biodiesel has a lower viscosity than petrodiesel, which improves its combustion properties. It is slightly miscible with water and has lubricating properties. Its calorific value is approximately 9% lower than that of standard diesel, impacting fuel efficiency. Biodiesel is also known to break down deposits of residue in fuel lines where petrodiesel has been used, which can lead to clogged fuel filters if not addressed promptly.
Due to its solvent properties, biodiesel can degrade natural rubber gaskets and hoses in older vehicles, particularly those manufactured before 1992. However, these parts tend to wear out naturally and are often replaced with FKM, which is non-reactive to biodiesel. Biodiesel is also used as a heating fuel in boilers, where it can burn without any conversion, although older furnaces with rubber parts may be affected by its solvent properties.
Biodiesel is rarely used in its pure form (B100) and is typically blended with petrodiesel at various concentrations. The blend percentage is indicated by a “B” factor, with B5 or B20 being common blends. These blends offer a compromise between the environmental benefits of biodiesel and the performance characteristics of standard diesel fuel. While biodiesel has lower energy content, leading to reduced engine power and fuel efficiency, it has been shown to result in less short-term engine wear than petroleum diesel.
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Biodiesel is cheaper to make than diesel
Biodiesel is a renewable and biodegradable alternative fuel made by chemically reacting fatty acids and alcohol. Typically, this involves combining vegetable oil with methanol in the presence of a catalyst, such as sodium hydroxide. While biodiesel is rarely used in its pure form, it is often blended with diesel fuel, with the blend percentage indicated by a ""B" factor. For example, B5 diesel fuel contains 5% biodiesel, while B20 contains 20% biodiesel.
Biodiesel offers several advantages over traditional diesel fuel. Firstly, it is derived from renewable resources, reducing our dependence on foreign oil. Secondly, biodiesel reduces tailpipe emissions, including soot and air toxics, making it the preferred fuel type of the US government. Additionally, biodiesel exhibits better short-term engine wear characteristics compared to petroleum diesel, although long-term tests are not yet available.
Despite these benefits, biodiesel faces challenges in terms of cost and production. The growth in the global population demands extensive land use for food production, competing with the need for feedstock to produce biodiesel. This dynamic contributes to concerns about land use changes and deforestation associated with biodiesel production. As a result, the environmental impact of biodiesel is complex and depends on factors such as feedstock type, land use changes, and production methods.
In certain contexts, biodiesel can be more cost-effective than diesel. For instance, in 2019, using B20 biodiesel instead of straight diesel fuel resulted in cost savings due to a price discount of 14 cents per gallon. However, the feasibility of biodiesel as a cost-competitive alternative depends on various factors, including government policies, taxes, and market dynamics. Overall, the decision to use biodiesel involves considering not only the price but also the environmental, performance, and societal benefits it offers.
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Frequently asked questions
Check that it is not marked as B100, B20, B5, or any other number followed by the letter B, which indicates the percentage of biodiesel in the fuel.
Biodiesel is typically blended with diesel and designated by the amount of diesel it's mixed with. In the US, biodiesel is blended at a rate of 5% or less into almost all diesel fuel sold.
Biodiesel is a renewable, biodegradable alternative fuel made from a mix of modified vegetable oils and diesel fuel. It reduces tailpipe emissions, including soot, air toxics, carbon monoxide, and particulate matter. It is also safer to handle and eliminates the risk of environmentally hazardous fossil fuel spills.
Biodiesel has a lower energy content than traditional diesel fuel, resulting in slightly lower fuel efficiency. It may also not be compatible with older engines, especially those that do not use common-rail ignition systems. Additionally, it requires resources that could otherwise be used for food.
Producing biodiesel requires an appleseed processor, waste vegetable oil (WVO), a catalyst (such as NaOH or KOH), and methanol. However, it is essential to understand the chemical dangers involved in the process, as some of the substances used are extremely caustic and can cause irritation.
