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I don't know what the current answer to your question is, but I did read an article this morning in Chemical and Engineering News that Novazymes has developed a new enzyme that is supposed to be tremendously more efficient in breaking down cellulose for ethanol production. The figure they gave in the article was it was supposed to reduce the cost per gallon from $5 to $0.50 (they didn't give any details of how they arrived at those figures, though).
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Here is a Ethanol info page from a Manitoba Canada biofuels web page. Item # 35 states that a USDA study determined there are 1.34 units of energy produced for every unit of energy expended in the production of ethanol.
Here is another website about home production of ethanol. There are several pages, a fun read. I just ordered there plans for a very efficient 5 gal/hr reflux still. I received an email from the daughter of the still designer, he died recently but she indicated the web page and plans will be maintained but there will no longer be any technical questions answered at this site but I was refered to a discussion group here. --------------------------------------------------------------------- 92 dodge cummins with over 260,000 miles. Running an unheated 50% diesel/50% WVO blend for about the last 75,000 miles when temps above 50 deg f, no modifications or heating except the addition of a throw-away in-line fuel filter (removed during cold weather). As of 8-01-05 I have been testing a 75% WVO/15% gasahol (90% RUG/10% ethanol)/10% diesel blend. Works fine down to about 65 f then starts rough. Runs ok once engine warms up. Back to a 50/50 diesel blend sence 9-15-05, just to cool now. -- 11-01-05 Modified stock fuel tank internal fuel pickup to have I.D. of 3/8 inch, this eliminated cold start slow idle and bogg on acceleration. Now adding 1 ounce each of acetone and pure gum spirits of turpentine to each 5 gallons of any blend, seems to help keep the fats in solution to a lower temperature --Heated 2nd tank in the works |
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This is a tricky question. There are some people who think that ethanol requires more fossil fuel energy to make than it gives back in return. That's what all the controversy was just before the US Energy Bill was passed last summer because of course the energy bill said that it would double ethanol production. A new study released last week (just before Bush's state of the union) said that ethanol from corn provides about +4 MJ/liter (so it's energy positve compared to the other study that said ethanol produces -3 MJ/liter). It's quite a long story.
You can follow the latest developments on this right here theWattPodcast.com - energy news & discussion in mp3 form |
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I wouldn't see problem because ethanol is produced with a lot of heat, it needs a little of fuel and can need a little of electric energy. You can see this http://www.greatchange.org/bb-alcohol2.html |
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Sponsors Biodiesel & SVO Home Biodiesel & SVO Forums General Energy Discussion Energy investment of ethanol
Biodiesel & SVO Home Biodiesel & SVO Forums General Energy Discussion Energy investment of ethanol© Maui Green Energy 2000 - 2008