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Literature review on biogas production pdf
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Ethanol has recently come under fire for a variety of reasons. Ethanol uses more energy to be produced that it can yield, it drives up the cost of food crops, and it cannot be shipped efficiently (Hargreaves.) So what can be done about the problems with ethanol? Is there a better option for alternative fuel? Yes, biobutanol is the answer. Biobutanol is butanol that has been created by a biomass fermentation process that is similar to ethanol, but the resulting fuel has a few key advantages. Biobutanol is more feasible fuel source then ethanol, it can make use of existing infrastructure, and biobutanol has been proven to replace gasoline gallon for gallon.
Butanol is a four-carbon alcohol that is currently used as a commercial solvent. Butanol can be made from the same biomass that produces ethanol, and is called biobutanol when it is made from such a process to distinguish the fuel produced from petroleum based butanol. Using biobutanol as a fuel is beneficial because of biobutanol’s energy content. Bioutanol is capable of producing 110,000 Btu’s per gallon. When compared to ethano...
In conclusion, Corn Ethanol Biofuel has many negative and positive effects. It has a negative effect because it releases greenhouse gases but positive effects as well because it is inexpensive to produce and use, and is a renewable source. The future of corn ethanol is uncertain: “Corn-based ethanol will most likely not be the staple fuel source in the future, as it is only a short term solution and poses problems in the long run. Ethanol contains 33% less energy than gasoline, and corrodes engines that it is used in. Average production and final sales are 62 cents/gal higher than conventional gasoline. Even though political support is waning, Congress will most likely not abandon corn ethanol.” ("Future of Corn Ethanol.) I think corn ethanol
The three butene products have been verified to elute in the following order: 1-butene, trans-2-butene, and cis-2-butene. Theory: The dehydration of 2-butanol, a secondary alcohol, progresses readily in the presence of a strong acid like concentrated sulfuric acid (H2SO4). The reaction is completed via the E1 mechanism. Initially, the hydroxyl group is a poor leaving group, but that is remedied by its protonation by the acid catalyst (H2SO4) converting it to a better leaving group, H2O. The loss of this water molecule results in a secondary carbocation intermediate that continues to form an alkene in an E1 elimination.
With the fuel crisis that is happening in the world today it is now more important than ever to begin the look towards alternative fuel sources. One smart step for the US would be to wean the country slowly off of the gasoline fix and to look into alternative fuels to replace the “never coming back” fossil fuels. It turns out that Ethanol as a hybrid fuel proves to be a notable candidate for this gasoline intervention, per say. Now the United States is currently looking to subsidize fossil fuel alternatives. However, before considering ethanol production as a governmental subsidy, using large amounts of hard earned tax payer money, there has to be many alternative factors that come into play such as making sure the pros out weight the cons as far as environmental benefits and performance output and not to mention looking at the entire matter from an economic or investment perspective. First we need to consider what the ethanol we are talking about actually is and how can we obtain it.
In conclusion, the fact that biofuel is renewable unlike other natural resources such as coal, nuclear fuels, and petroleum makes it an excellent energy solution. However, there are still several major problems that need to be fixed before biofuel is recognized universally and used on an industrial scale.
In the United States we have been looking into alternative energies to reduce our dependence on oil and help reduce our carbon footprint. One method the EPA has come out in support of is ethanol production. Ethanol is considered a green fuel because it recycles the burned carbon each time new crops are grown. In theory ethanol is a good stepping stone between using gasoline and zero emission power sources. However biofuels are still young technology that has many problems before it can be useful. The EPA is in full support of biofuels and has mandated that by 2020, 36 billion gallons of biofuels are to be produced in America. Currently almost all of America biofuels comes in the form of corn based ethanol which is extremely inefficient and can cause sustainability problems. Due to this reason only 15 billion gallons of the mandated biofuels can be form corn based ethanol. The rest of the biofuel must come from non-corn based alternatives such as cellulosic ethanol which the EPA projects to create all most all of the 21 billion remaining gallons of ethanol. Cellulosic ethanol uses the cellulose that is in all plants matter to create ethanol. Cellulosic ethanol is far more efficient than corn ethanol because you can use the whole plant and it sets no limitation on what type of plant matter can be used. Even though the EPA projects that these number will be achievable, due to current setbacks and efficiencies cellulosic ethanol will not be able to meet this output within the time constraints and a goal of 2034 years would be more realistic in the long run.
Ethanol production was developed in hopes of severing our ties with fossil fuels in favor of alternative energy, such as biofuels. Although, VOCs emissions are released during production of ethanol in a factory, the quality of air is greatly improved when burning ethanol versus fossil fuels. Burning ethanol instead of fossil fuels reduces the amount of cancer-causing greenhouse gases that go into the atmosphere. Ethanol production ranks at the bottom of industrial water usage, but is still not out of the woods with the abundance of water usage needed in corn feedstock and ethanol manufacturing and processing facilities. Many acres of land are needed to grow corn crops, however, many corn farmers are successful in growing more corn on less acreage.
Tyner, Wallace. “The U.S. Ethanol and Biofuels Boom: Its Origins, Current Status, and Future Prospects.” BioScience. August 2008. Vol 58 (7):646
the same will be the height of the tin can above the wick. I will keep
Technically, the method is not thought of as a biofuel because it was not produced from a crop. Ethylene is used and it is produced through catalytic cracking. This is an addition reaction that is exothermic and is shown through the equation: CH2=CH2(g) + H2O(g) → CH3CH2OH(l) ΔH = - 45kj
Alcohol is something that most people have experienced in their teenage years or adult life, and with that they would have also learned about some of the effects that it had on the body. Alcohol targets the central nervous system (CNS) which it why when a lot is consumed subjects reflexes become slower their speech can be slurred and their coordination is off. If very large quantities are consumed the subject could have more severe conditions occur which can result in a coma, respiratory failure or even death. The question is why does alcohol have this effect on living organisms. There are obviously many different factors that alcohol is able to disrupt in the body, but one of the major processes that it affects is the GABAA receptor which
Ethanol as a vehicle fuel is not a new concept. Henry Ford designed the framed Model T to run on alcohol, he said it was “the fuel of the future”. The oil companies thought otherwise, however the oil crisis of the early 1970s gave ethanol fuel the new lease of life. More than two trillion miles have been driven on ethanol blended fuels in the United States since 1980. Ethanol can save our future children generations of work by keeping our planet clean and prevent warfare.
The problem today is the gas companies make too much on their products. Shell's profits jumped enormously in only three months. The Company announced an 80% jump in earnings for the last three months, to $3.25 billion (Shell Posts Record Profits). Ethanol would allow these profits to go straight to
Ethanol is a clean, renewable fuel made from plant material. Ethanol is cleaner than gasoline because it contains more oxygen. The added oxygen increases ethanol's octane rating. The octane rating is the fuel's ability to resist “knock”. Ethanol has a higher octane rating than gasoline. Ethanol above fifteen percent can damage vehicles that are designed to run on gasoline. An ethanol/gasoline (E10) blend is cheaper than just gasoline. The blend does reduce fuel economy by up to 3.3 percent. Car companies have started to produce flex-fuel vehicles. These flex-fuel vehicles can run on fuel with up to 85 percent ethanol. The main problem is
Investigation to Find the Relative Energy Release of Five Alcohols: Ethanol, Methanol, Propanol, Butanol and Propanol
The concept of this essay is to stress that biofuels are a viable and sustainable energy source than fossil fuels, showing its advantages but not ignoring its disadvantages which also enlightens us about the cleaner and renewable natural resources. Biofuels is an alternative source of energy which can end the global dependence on fossil fuels.