Ethanol:
Ethanol is an alcohol-based alternative fuel that is made by fermenting and distilling crops such as corn, barley or wheat. Ethanol has a long history as a fuel, including as a fuel for internal combustion engines. Ethanol, also known as ethyl alcohol, drinking alcohol or grain alcohol, is a flammable, colorless chemical compound, and is best known as the alcohol found in alcoholic beverages. The largest single use of ethanol is as a motor fuel and fuel additive. The largest national fuel ethanol industries exist in Brazil. Compared to gasoline, ethanol cuts poisonous gas emissions (carbon monoxide, nitrous oxides, sulfur dioxide) and produces fewer greenhouse gases that cause global climate change and global warming. Added to gasoline, ethanol also reduces ground-level ozone formation by lowering volatile organic compound and hydrocarbon emissions, decreasing carcinogenic benzene, and butadiene, emissions, and particulate matter emissions from gasoline combustion. In North America, ethanol is presently made principally from corn and wheat. Ethanol can be produced for different applications, for example, industrial ethanol or fuel grade ethanol. Research into technology to produce ethanol from non-food sources is advancing rapidly and is close to commercialization.
On a volumetric basis, ethanol and biodiesel have lower energy contents than do gasoline and distillate fuel oil, respectively. The lower energy content of ethanol and biodiesel generally results in a commensurate reduction in miles per gallon when they are used in engines designed to run on gasoline or diesel. In the future, increased use of ethanol as a transportation fuel will raise the issue of fuel volume versus energy content. Ethanol contains less energy per gallon than does conventional gasoline. A gallon of ethanol has only two-thirds the energy of a gallon of conventional gasoline, and the number of miles traveled by a given vehicle per gallon of fuel is directly proportional to the energy contained in the fuel.
The price of ethanol is closely tied to the price of oil. Ethanol composes a tiny fraction of total fuel consumption, and as an alternative to oil, it must therefore be sold at a price that competes with oil. As the price of oil rises, the price at which ethanol producers can sell their ethanol also rises. When the government announces new initiatives to support renewable energy, ethanol, or cellulosic ethanol, stocks in the sector tend to benefit. Oil companies and car manufacturers don't want to invest in new technologies to distribute and utilize ethanol until there is widespread supply, but ethanol producers don't want to invest in more production until they are sure it is feasible for use by vehicles on the road and the gas stations that fuel them. Cellulosic ethanol in particular, which requires investment in research and development before it can achieve cost-parity with grain-based ethanol, will be supported by the widespread adoption of new distribution systems and automotive technologies. In the transportation sector, ethanol is the most widely used liquid biofuel in the world.
Ethanol used for gasoline comes in various types. E85 is a blend of gasoline and ethanol that is 85% ethanol by volume. E10 is, similarly, a blend that is 10% ethanol by volume. It is becoming common practice in North America to blend ethanol with gasoline at concentrations of 7 to 10 percent by volume. All cars built since the 1970s are fully compatible with up to 10 percent ethanol (E10) in the fuel mixture. All manufacturers approve the use of E10 blends and warrant their vehicles for this fuel. From a vehicle performance and fuel consumption perspective, low-level ethanol fuel blends are indistinguishable from gasoline. Ethanol can be used in much higher proportions - up to 85 percent ethanol and 15 percent gasoline (E-85), however many cars in North America are not equipped to use this.
Newer technology converts biomass forestry by-products, such as wood chips and non-compostable trash such as municipal waste into ethanol. This type of cellostic ethanol is a promising development, as our food supplies are not used as fuel. Ethanol will likely be widely used in one form or another as an energy source in the near future.
E85 Ethanol:
E85 is simply a blend of gasoline and ethanol that is 85% ethanol by volume E-85 ethanol is used in engines modified to accept higher concentrations of ethanol. Such flexable fuel vehicles (FFVs) are designed to run on any mixture of gasoline or ethanol with up to 85% ethanol by volume E85 is an alcohol fuel mixture that typically contains a mixture of up to 85% denatured fuel ethanol and gasoline or other hydrocarbon (HC) by volume. E85 as a fuel is widely used in countries like Sweden and Brazil and is becoming increasingly common in North America especially in areas where corn is a major crop and is the primary source material for ethanol fuel production. Most of the vehicles on the road today are not equipped to handle E85 ethanol and there are not many stations that currently have it but this will change as long of the price of gasoline rises and we become more environmentally conscious.
E10 Ethanol:
E10 is a blend that is 10% ethanol by volume. E10 is 10% ethanol and 90% unleaded gasoline. Today, this fuel blend is covered under warranty by every U.S. automobile manufacturer, for every make and every model, and is recommended by many because of its high octane and superior performance characteristics. E10 is the blend in the majority of the more than 4.8 billion gallons of ethanol used annually in the U.S. Blends of 5.7% or 7.7% are used in a few areas of the United States.
M85 Methanol:
M85 is Methanol typically made from natural gas; though it is possible to produce it by fermenting biomass, however, this is not economically competitive yet. Because it is easier to transport natural gas to a distant market by converting it to methanol, which is a liquid at ordinary temperatures and pressures, than by chilling and liquefying it or by building a long pipeline, some petroleum-exporting countries are looking at exporting their "waste" natural gas by converting it to methanol, however, most of the natural gas that goes into methanol in the United States is still domestically produced. Most fuel methanol in this country is sold as a blend of 85% methanol with 15% unleaded premium gasoline, called "M85". In the not-too-distant future, "neat" (100%) methanol may be the preferred means of storing hydrogen for fuel-cell electric vehicles, but this technology is still in the research and development stage stage.
Cellulose Ethanol:
Traditionally, we've used corn as the primary ingredient in the production of ethanol. The next frontier is cellulosic ethanol - ethanol made from plant materials like corn stalks, switch grass, wood chips and even refuse. Traditionally, we've used corn as the primary ingredient in the production of ethanol. Unlike today's ethanol, in which sugars and starches are the main materials, or "feedstock," used in production, cellulosic ethanol's raw material is cellulose from other plant sources. Ethanol is also a form of renewable energy, which means that it is not derived from finite fossil fuels. The vast majority of ethanol produced today - "grain ethanol" - comes from sugar from corn, sugar cane, or sugar beets. Cellulosic ethanol is produced from more widely available plant-based materials, such as wood and grass, and can even be made from urban and animal waste. Also some municipal waste can be converted into cellulose ethanol.
While the end result - ethanol - is the same whether it is produced from grain or from cellulose. Producing ethanol from cellulose has several advantages over producing ethanol from grain. Since it is produced from non-edible parts of plants, cellulosic ethanol does not compete with the production of food, competition that can cause significant price volatility. The production of cellulosic ethanol is also more energy efficient than the production of grain-based ethanol, which requires natural gas, resulting in greater decreases in the greenhouse gas emissions, which many claim, contribute to climate change. It is now widely accepted that the future of ethanol is cellulosic: Rather than distilling corn for ethanol to fuel our cars, accepted wisdom is now that we will be able to replace a large fraction of our current fuel consumption with ethanol distilled from agricultural and forestry waste, as well as dedicated energy crops, such as switchgrass and hybrid poplar. Cellulosic ethanol also has the potential to alleviate the greatest stumbling block of corn ethanol as a potential replacement of gasoline: that there is simply not enough of it. Corn ethanol will only be able to displace a small percentage of total US gas consumption. Recently, cellulosic ethanol has been much in the news. FPL Energy LLC signed a deal with Citrus Energy to develop a bio refinery to make ethanol from citrus waste. Currently, Iogen Corporation in Ottawa, Canada produces just over a million gallons annually of cellulose ethanol from wheat, oat and barley straw in their demonstration facility Also, a Canadian company is one of the first companies in the world to take garbage from municipal waste in turn it into gas. Enerkem's facility in Quebec will use garbage and convert it into cellostic ethanol. The new technology converts biomass forestry by-products, such as wood chips and non-compostable trash into ethanol. This type of ethanol is produced from stuff that no one wants. This is the type of ethanol that is not produced from food crops. It is estimated that there is enough of this type of garbage in landfills that can power millions cars per year. With additional processing, plants and other biomass residues including urban wood waste, forestry residue, paper and pulp liquors, and agricultural residue can be processed into fermentable sugars. The main byproduct, lignin, can be burned for steam or power generation. Assuming the development of cost-effective production facilities, cellulosic biomass feedstocks like switchgrass, agricultural residues, and hybrid poplar trees could supply a growing ethanol industry with large quantities of less expensive raw materials. The underutilization of crop residue has driven decades of research into ethanol production from cellulose; however, several obstacles continue to prevent commercialization of the process, including how to accelerate the hydrolysis reaction that breaks down cellulose fibers and what to do with the lignin byproduct. The extent to which costs can be reduced through a combination of advances in the production process for cellulosic ethanol and learning as plants are constructed in series will be important to the future competitiveness of cellulosic ethanol. Cellulose ethanol currently is not cost-competitive with gasoline or corn-based ethanol, but considerable research and development by the National Renewable Energy Laboratory and its partners has significantly reduced the estimated cost of enzyme production. Although technological breakthroughs are generally unpredictable, further significant successes in R&D could make cellulosic ethanol a viable economic option for expanded ethanol production in the future. Cellulosic ethanol has the potential to make ethanol a much more energy-efficient fuel, with yields that about double what the starch-based processes yield today. However, until very recently, the cost for producing cellulosic ethanol has been prohibitive, and the process has yet to hit mainstream ethanol production.