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The other side of ethanol (a bit long)
Posted by Greg W [Email] (more from Greg W) on Wed, 25 Aug 2004 13:03:10
In Reply to: OT: Ethanol conversions?, Brian_in_MA, Wed, 25 Aug 2004 06:56:26
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Brazil uses a gasoline blended with 15-20% ethanol, not a straight ethanol blend. Ethanol has uses as a gasoline blend component, primarily for gasolines needing oxygenates or to cost-effectively boost octane (but only a couple of octane numbers). Racing fuel uses methanol (made from natural gas), different than ethanol. However, there's some bad sides to ethanol as a fuel:
- As Dean points out, ethanol has lower energy content (aka heating value) then gasoline, or even other oxygenates like TAME, ETBE, and MTBE.
- With ethanol's affinity for water, there's an issue with water saturation, especially when you move towards pure ethanol. When ethanol saturated with water is cooled down (say driving into the mountains, or at night), water drops out and collects in gas tanks.
- Ethanol is more volatile, which contributes to fugitive evaporative emmissions.
- Manufacturing ethanol is also very energy-intensive, requiring almost as much energy to produce a liter as is contained in that liter of ethanol.
There's no simple answer to the question of energy source for a mobile society...
posted by 146.27.12...
Posts in this Thread:
- OT: Ethanol conversions?, Brian_in_MA, Wed, 25 Aug 2004 06:56:26
- Re: OT: Ethanol conversions?, John Blas, Wed, 25 Aug 2004 21:36:32
- The other side of ethanol (a bit long), Greg W, Wed, 25 Aug 2004 13:03:10 <-- Viewing This Message
- Re: OT: Ethanol conversions?, 99 9-3 HOT, Wed, 25 Aug 2004 10:52:03
- Re: OT: Ethanol conversions?, Dean, Wed, 25 Aug 2004 10:32:00
- Brazil, Bill Homer
, Wed, 25 Aug 2004 10:58:13
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