The main disadvantages of biodiesel are its higher viscosity, lower energy content, higher nitrogen oxide (NO _x ) emissions, lower engine speed and power, injector coking, engine compatibility, high cost, and higher engine wear [3].

What are the challenges of biofuel production?

These challenges are in the areas of (i) feedstock production, (ii) feedstock logistics, (iii) development of energy efficient technologies (pretreatment, enzyme hydrolysis, and microbial fermentation), (iv) coproducts development, (v) establishment of biofuel and biochemical standards, (vi) biofuel distribution, (vii) ...

What is the main problem in using biodiesel?

The most common problems with fuel quality are (1) the biodiesel may contain some "unconverted"vegetable oil (incomplete processing), (2) traces of chemicals from the making of the biodiesel (e.g., methanol, lye) can remain in the biodiesel, (3) products of the reaction (e.g., glycerin, soaps) may not be completely ...

What factors affect the production of biodiesel?

Biodiesel can be produced from plant and animal fats through transesterification reaction. The transesterification reaction is affected by molar ratio of alcohol, presence of water and Free Fatty Acid content, reaction temperature, catalyst concentration and agitation speed.

What are the limitations of biodiesel?

Disadvantages of Biodiesel

• Variation in Quality of Biodiesel. ...
• Not Suitable for Use in Low Temperatures. ...
• Biodiesel Could Harm the Rubber Houses of Some Engines. ...
• Biodiesel is Way More Expensive than Petroleum. ...
• Food Shortage. ...
• Increased use of Fertilizers. ...
• Clogging in Engine. ...
• Regional Suitability.

The Problem with Biofuels

What are some disadvantages of biofuel?

Disadvantages of Biofuels

• High Cost of Production. Even with all the benefits associated with biofuels, they are quite expensive to produce in the current market. ...
• Monoculture. ...
• Use of Fertilizers. ...
• Shortage of Food. ...
• Industrial Pollution. ...
• Water Use. ...
• Future Rise in Price. ...
• Changes in Land Use.

What are some pros and cons for biodiesel?

Other pros include potentially being a renewable fuel source, high conductivity, and increased lubricity. Biodiesel does not hold as much power when compared to regular diesel or gasoline based fuels. This results in a loss of power, and it is pretty significant. Biodiesel is about ten percent less powerful.

How can biodiesel production be improved?

In biodiesel production, increasing temperature will increase how quickly biodiesel is produced. A study by Freedman et al. (1984) with soybean oil found that a temperature of 140°F could produce 94% of the total biodiesel yield in about 6 minutes versus a yield of 64% at 90°F (Fig. 4).

Why Methanol is used in biodiesel production?

Methanol and ethanol are the most often used alcohols in biodiesel production. Methanol is particularly preferred because of its physical and chemical advantages. Beside its reaction with triglycerides is quick and it can be easily dissolved in NaOH [57].

How biodiesel is produced?

Biodiesel is produced from vegetable oils, yellow grease, used cooking oils, or animal fats. The fuel is produced by transesterification—a process that converts fats and oils into biodiesel and glycerin (a coproduct).

What is the biggest challenge of biofuels?

A major challenge originates from issues dealing with international trade and the transportation of biofuels. These issues range from feedstock costs and availability to fuel quality and the international compatibility of biofuel testing standards.

What are the major obstacles to reducing fossil fuel consumption through use of biofuels?

A major hurdle to commercialization of biofuels is their cost in comparison to petroleum-based fuels. Lower energy density and the price of raw materials make biofuels more expensive when producing heat. And the higher the biofuel content of the fuel, the lower the energy density and thus energy efficiency (see Fig.

Why is biofuel expensive?

"The feedstock inputs you need for biodiesel are more expensive than petroleum is," Jones Prather said. "On top of that, the processes for producing the fuel aren't yet efficient enough so that you can produce it very cheaply."

Does biofuel have less emissions?

MYTH: In terms of emissions, biofuels emit the same amount as gasoline or more. FACT: Biofuels burn cleaner than gasoline, resulting in fewer greenhouse gas emissions, and are fully biodegradable, unlike some fuel additives. Cellulosic ethanol has the potential to cut greenhouse gas emissions by up to 86%.

Which catalyst is best for transesterification?

Nanosized CaO is an effective catalyst for transesterification of jatropha oil by a two-step process and has been observed to enhance biodiesel yield up to 98.54%.

What is the most preferred catalyst is used to make biodiesel?

Homogeneous catalysis involves a sequence of reactions that is catalyzed by a chemical that is in the same phase as the reaction system. The most preferred catalyst used for the production of biodiesel is the homogeneous catalyst, as they are simple to use and require less time to achieve a complete reaction.

What is the catalyst in transesterification?

Transesterification can be catalyzed by acids catalysts, preferably by sulfonic and sulfuric acids. These catalysts give very high yields in alkyl esters but these reactions are slow, requiring typically temperature above 100 °C and more than 3 h to complete the conversion [23].

How do you calculate biodiesel yield?

1. Yield of biodiesel(%) =mass of biodiesel obtained / mass of oil used. Normally we get an yield of 95-100%. ...
2. Ester Content (%)= cumulative mass of methyl esters/ mass of biodiesel. ...
3. Conversion Efficiency(%).

Is biodiesel bad for the environment?

Regarding non-GHG environmental impacts, research suggests that production of biofuel feedstocks, particularly food crops like corn and soy, could increase water pollution from nutrients, pesticides, and sediment (NRC 2011). Increases in irrigation and ethanol refining could deplete aquifers (NRC 2011).

What are the negative consequences of biofuel production?

Producing more biofuel crops will also affect water quality. For example, converting pastures or woodlands into maize fields may increase problems of soil erosion and runoff of excess nitrogen and phosphorous into surface and groundwaters. Pesticides and other chemicals can also wash into waterbodies.

What obstacles have prevented biofuels from becoming a major source of energy in the US?

A major impediment to increasing cellulosic biofuel production is the large capital investment required for commercial production facilities. A 2009 report estimated the capital cost of a cellulosic-ethanol biorefinery with a capacity of 40 million gallons per year to be about $140 million (2007$) (NAS-NAE-NRC, 2009).