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  • Created by: Georgia
  • Created on: 11-01-13 15:13
Preview of Bioethanol

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Synoptic booklet ­ Figure 11
What is it?
· Petrol substitute for road transport vehicles (or can be mixed with petrol 510% bioethanol)
· Produced by the sugar fermentation process, (can also be manufactured by the chemical process of
reacting ethylene with steam)
· Particularly developed in Brazil
· Main sources of sugar required to produce ethanol come from fuel or energy crops such as wheat or
· Carbon neutral carbon dioxide (CO2) emitted during its use is offset by the absorption from the
atmosphere during its growth.
· Lifecycle greenhouse gas emissions can be reduced by 90% with bioethanol compared to petrol
· UK government has reduced fuel duty on bioethanol which offsets the higher production costs
· E85 2p cheaper than petrol
· Renewable fuel as the crops are not a finite source
· Blending bioethanol with petrol will help extend the life of the UK's diminishing oil supplies and ensure
greater fuel security, avoiding heavy reliance on oil producing nations
· Rural economy would also receive a boost from growing the necessary crops
· Biodegradable and far less toxic that fossil fuels
· Using bioethanol in older engines can help reduce the amount of carbon monoxide produced by the
vehicle thus improving air quality
· Quantities up to 5%, bioethanol can be blended with conventional fuel without the need of engine
· The output of energy during the production is more than the input
· The fuel spills are more easily biodegraded or diluted to non toxic concentrations
· Poorer nations would benefit a lot, source of income and resources can't be exploited as the source is
renewable, this gives them more power and they are able to develop, narrowing the development gap
· A large amount of arable land is required to grow crops
· Some farmers may sacrifice food crops for biofuel production, which will increase food prices around
the world.
· Is it really carbon neutral? During the production process of bioethanol a huge amount of carbon
dioxide is released which makes its ecological effectiveness close to zero
· Burning 1 liter of ethanol gives 34% less energy than burning the same amount of petrol ­ not as
efficient as petrol and more bioethanol would be demanded in order to provide enough energy
· Pay more for more fuel to do the same work. So the use of bioethanol in public transportation will lead
to increasing the price of the service
· Too many older cars are currently unequipped to handle even 10% ethanol
· The engines made for working on the new energy cannot be used for their petrol or diesel variants.
· Phosphorous and nitrogen used in the production have negative effect on the environment
· Absorbs water from the air and has high corrosion aggressiveness. Only transported by auto transport
or railroad
· Pure ethanol is also difficult to vaporise which can make starting a car in cold weather difficult and that
is why most fuels retain at least a small amount of petrol


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