Category Archives: Advances in Bioethanol

Small Engine Equipment

Ethanol blends can also be used in small engines such as lawn mowers, chainsaws, and weed trimmers (Launder 1999). The benefits of using ethanol would again be decreased emissions. The Portable Power Equipment Manufacturers Association has conducted reformulated fuel research for chainsaws, weed trimmers, and other handheld equipment and observed no operating problems with equipment when using reformulated gasoline. Study […]

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Benefits and Problems with Ethanol

6.1 Benefits Ethanol provides several benefits. It is easily biodegraded in the environment and produces much less pollutants in internal combustion engines than petroleum fuels (Green fuels 1998a, b). It has low toxicity and is miscible with water. Many car makers are producing more vehicles with tolerances to burn high %E fuels more efficiently. Thus, the risk posed by ethanol […]

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Ethanol Based Engines

Ethanol is most commonly used to power automobiles, though it may be used to power other vehicles, such as farm tractors and airplanes. Ethanol (E100) con­sumption in an engine is approximately 34 % higher than that of gasoline (the energy per volume unit is 34 % lower). However, higher compression ratios in an ethanol-only engine allow for increased power output […]

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Recirculation of Process Stream

The water consumption is reduced by recirculating process streams for use in the washing and hydrolysis steps (Palmqvist and Hahn-Hagerdal 2000). Recirculating part of the dilute ethanol stream from the fermenter can increase the ethanol con­centration in the feed to the distillation stage. However, computer simulations have shown that recirculation of streams leads to the accumulation of nonvolatile inhibi­tory compounds […]

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Important Developments in the Production of Cellulosic Ethanol

Ethanol-from-cellulose (EFC) holds great potential due to the widespread avail­ability, abundance, and relatively low cost of cellulosic materials. Significant investment into research, pilot, and demonstration plants is ongoing to develop commercially viable processes utilizing the biochemical and thermochemical con­version technologies for ethanol. Johnson et al. (2010) have reviewed the current status of commercial lignocellulosic ethanol production. Table 3.3 summarizes all […]

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The Australian government has supported ethanol since 2000 with a range of tax exemptions and production subsidies, aiming to produce 92 million gallons of biofuel by 2010, enough to replace 1 % of total fuel supply. 2006 production of ethanol stood at 39.4 million gallons. In view of low consumer confidence in ethanol, the government launched a campaign to encourage […]

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