Re: Hawaii to be national renewable energy example?
- From: "Alvin E. Toda" <aet@xxxxxxxx>
- Date: Fri, 15 Feb 2008 05:20:03 -0000
On Thu, 14 Feb 2008, Maren at google wrote:
During combustion ethanol reacts with oxygen to
produce carbon dioxide, water, and heat: (other air
pollutants are also produced when ethanol is burned
in the atmosphere rather than in pure oxygen)
C2H6O + 3O2 -> 2CO2 + 3H2O Together, these two
equations add up to the following:
C6H12O6 + 6O2 -> 6CO2 + 6H2O + heat
end of quote)
How can you burn something (hydro-)carbon based
without producing CO2? (unless you have incomplete
combustion in which case you get CO which is worse)
Of course that is the case. But they are both products
that take carbon dioxide out of the air-- ethanol and
vegetable oil. That makes it Carbon neutral. Perhaps
this article will state it better
http://spectrum.ieee.org/jan08/5866
Here's a short excerpt:
"The first step would be to capture the carbon dioxide
from sources where it is concentrated, such as power
plants and industrial smokestacks, says James E.
Miller, a chemical engineer who is one of the lead
researchers on Sandias Sunshine to Petrol project. But
the ultimate goal would be to snatch it out of the air
to yield carbon-neutral liquid fuel, he says."
This is a process that just uses sunshine which we have
a lot in Hawaii to produce ethanol from the CO2 in the
air. It's a little different from the other
carbon-neutral processes of sugar, cellulosic ethanol
or algae vegetable oil.
.
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