Rajan Wilcox
Soybeans are a major crop in North America, South America, and Asia, with the United States being the world's largest producer. Soybeans are a good source of oil, containing approximately 18 to 20% oil, and soybean oil is a major feedstock for biodiesel production. Soybean biodiesel is considered a cleaner fuel than regular diesel as it is plant-based and captures carbon dioxide from the air during its growth. However, turning soybeans into diesel fuel has been a controversial topic due to its high cost, with some arguing that it is a waste of resources that could be used for food and animal feed. Despite these concerns, the demand for soybean biodiesel has led to a new industry, with the United States imposing duties on Argentine biodiesel to block it from their market.
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What You'll Learn
Soybeans are a major crop in North America, South America and Asia
Soybeans are a major crop in North America, South America, and Asia. In the US, a law mandates that some soybeans be turned into biodiesel fuel for trucks, which is costing American consumers about $5 billion each year. This is because biodiesel is much more expensive than petroleum diesel. However, defenders of biodiesel argue that it is a cleaner fuel than regular diesel as it is derived from plants that capture carbon dioxide from the air as they grow.
Soybeans are a versatile crop. When crushed, they yield both meal and oil. China's demand for soy meal to feed its pigs and chickens has boosted global supplies of soy oil. This is a reversal of the situation a century ago when soybeans were primarily grown for their oil.
Soybeans are a popular crop in South America, with some reports linking America's biodiesel demands to deforestation in Argentina. This is because, to meet the demand for biodiesel, more soybeans need to be grown, which requires clearing forests or plowing grasslands, releasing carbon dioxide into the atmosphere.
Asia is also a significant producer of soybeans, with China being a major consumer of soy products. Soybeans are used not only for biodiesel but also for animal feed and other industrial purposes.
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Soybeans are a good source of oil for biodiesel
Soybean oil is a major feedstock for biodiesel production, which is a mixture of chemical compounds known as alkyl esters produced from vegetable oils, fats, and greases. The most common method of biodiesel production involves a reaction of vegetable oils or animal fats with methanol or ethanol, yielding biodiesel and a byproduct of glycerin. Biodiesel is a cleaner fuel than regular diesel as it is derived from plants that capture carbon dioxide from the air as they grow.
The use of soybean oil for biodiesel has been promoted by U.S. soybean farmers through the United Soybean Board (USB) and the subsequent creation of the National Biodiesel Board (NBB). The profitability of soybean biodiesel is variable and based on changing prices of biodiesel, soybean oil, co-product glycerin, methanol, and natural gas. One challenge for soybean biodiesel is the competition with other uses of soybean oil, such as in human food products, cooking oil, and industrial applications.
The growth in soybean biodiesel production has coincided with federal biofuel mandates and conditions that encourage a larger share of soybean oil to be used as biofuel feedstock. The Renewable Fuel Standard (RFS) program, administered by the U.S. Environmental Protection Agency, has played a significant role in increasing biodiesel production. However, critics argue that the demand for soybean biodiesel contributes to deforestation and the release of carbon dioxide into the atmosphere.
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Soybean biodiesel is expensive
Secondly, soybean biodiesel production is costly due to the prevalence of soybean pests and diseases. Soybeans are susceptible to various pests, including the soybean cyst nematode, a parasitic roundworm that damages soybean roots. They are also vulnerable to soybean rust, a fungal disease that requires expensive fungicide treatments and can cause significant yield damage.
Additionally, the process of producing biodiesel from soybean oil involves additional costs. The transesterification reaction used to convert soybean oil into biodiesel requires methanol or ethanol, as well as a catalyst like sodium hydroxide. These inputs add to the overall expense of soybean biodiesel production.
Moreover, the demand for soybean meal in China has increased the global supply of soybean oil, impacting the cost of soybean biodiesel. China's demand for soy meal to feed its livestock has resulted in a surplus of soybean oil, which is then sold on the market. This dynamic has influenced the availability and pricing of soybean oil for biodiesel production.
Lastly, the law requiring the use of biodiesel in the United States has contributed to the high cost of soybean biodiesel. The Renewable Fuel Standard (RFS) mandates the blending of renewable fuels, including biodiesel, into the nation's fuel supply. This has driven up the demand for biodiesel and, consequently, the price. According to Scott Irwin, an economist at the University of Illinois, the extra cost for biodiesel is about $1.80 per gallon, resulting in an additional expense of $5.4 billion per year for Americans.
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Soybean biodiesel is better for the environment
Soybean biodiesel yields 4.56 times the fossil energy needed to produce it, compared to petroleum diesel, which has a fossil energy ratio of 0.84. This means that soybean biodiesel is a much more energy-efficient fuel source. In addition, the production of soybean biodiesel does not involve extracting fuels from the ground, but rather from plants that capture carbon dioxide from the air as they grow.
Soybeans are widely grown, and the infrastructure and equipment to grow, transport, and process them already exist. The leftover soybean meal is also important for animal feed. Soybean acreage is much greater than other oilseed crops, leading to substantial soybean oil production and its availability as a biofuel feedstock. Soybean biodiesel is also beneficial for farmers, as they can fuel their farm equipment with it.
The environmental impacts of soybean biodiesel have been assessed using the LCA methodology, which found that the solar energy and CO2 uptake in biomass agriculture, as well as the reduction of dependency on fossil fuels, lead to better performance in terms of abiotic depletion potential (ADP), global warming potential (GWP), and ozone depletion potential (ODP) in the life cycle of biodiesel compared to fossil diesel.
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Soybeans are easy to grow
Soybeans are a versatile crop with a variety of applications, including the production of biodiesel fuel. While there is some debate about the environmental impact and cost-effectiveness of soybean biodiesel, soybeans themselves are relatively easy to grow.
Soybeans are well-adapted to grow in soils similar to those used for corn production, and they can be grown in rotation with corn or wheat to break insect, weed, and disease cycles. Soybeans have lower nutrient requirements than other crops, as they are nitrogen fixers, gaining much of the nitrogen they need through a relationship with bacteria. A soil pH between 5.5 and 7.0 will enhance nutrient availability and soybean growth.
Soybean seeds should be planted directly into the garden bed in early spring when the soil temperature reaches 60°F. They are sensitive to frost and should be planted accordingly. Seeds should be sown 1-1.5 inches deep and spaced approximately 4 inches apart, with rows at least 2 feet apart to accommodate the bushy plants. Soybeans require sunlight, warmth, and moderate moisture but be careful not to overwater as the seeds can rot easily.
If you live in a cold climate with a short growing season, you can start your soybeans indoors 6 to 8 weeks before the last frost date and transplant them outdoors as the soil warms. However, planting too late in the season, even in early summer, will affect the size of the plants and soybean yields. Soybeans grown for their fresh pods will need 45 to 65 days to mature, while dry beans will need at least 100 days.
Soybeans are widely grown and are a major crop in North America, South America, and Asia. The United States is the world's largest producer, contributing approximately 32% of the global soybean supply. Soybeans are a versatile and relatively easy crop to grow, making them a popular choice for biodiesel production and various other applications.
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Frequently asked questions
Yes, soybean oil can be used to make biodiesel.
The most common method of biodiesel production is a reaction of vegetable oils or animal fats with methanol or ethanol in the presence of sodium hydroxide. The transesterification reaction yields methyl or ethyl esters (biodiesel) and a byproduct of glycerin.
Soybeans are widely grown, and the infrastructure and equipment to grow, transport and process them already exist. Additionally, the leftover soybean meal is important for animal feed. Soybean biodiesel is also a much cleaner fuel than regular diesel as it is made from plants that capture carbon dioxide from the air as they grow.
Soybean biodiesel is very expensive, costing Americans about $5.4 billion a year. Additionally, using soybean oil for biodiesel can cause price spikes in the soybean oil market as soybean oil is also used for many human food products, cooking oil, and industrial applications.
