Good info., always did sort of like methanol over ethanol, for one reason or
another.To bad it's so nasty to work with.
I found a formula, that achieves a 3.7% O2 increase, called Waiver, by DuPont,
it's 5% Methanol and 2.5% Ethanol, and does the same as 10% Ethanol, and is
better than 11% MTBE ( 2% O2 ). From the info. I gathered, it appears that they
thought that MTBE would be better because it can be made at the same refineries
as the gasoline.
I don't have my chemistry book handy, but, I can't help but wonder if any of
the other alcohols, would work as O2 transporters for naturally aspirated
diesel engines at high altitudes?
Greg H.
- Original Message -
From: Martin Klingensmith
To: biofuel@yahoogroups.com
Sent: Wednesday, August 11, 2004 21:08
Subject: Re: [biofuel] Ethanol / Methanol mix
Hello Greg,
Methanol is CH3O [atomic mass 31 grams per mole] and ethanol C2H6O [46 g/M].
As you can see there is an oxygen atom in each molecule. Ethanol has
more energy than methanol because it has more bonds than methanol.
Plain old gasoline is just a series of carbon bonds such as C-C-C-C-C-C
[with hydrogen all around]
MTBE is C5H12O [88 g/M] which, as you can see, is much more massive than
either ethanol or methanol yet only has 1 oxygen atom.
Since mixtures are done by weight[mass], you could for example have 1kg
of methanol mixed with 9kg of gasoline (a 10% mixture). The mass of the
added oxygen would be approximately 500 grams and the oxygen would be
about 5% in the whole mixture. If you had 1kg of MTBE with 9kg gasoline
(again 10%) then the mass of the oxygen would be approximately 180 grams
and the oxygen would be about 1.8% of total mass.
So methanol would be a much better oxygenator according to my chem 105
as I remember it calculations. They very well could be off by +/-90% :)
Ethanol would be slightly less efficient as an oxygen donor.
So basically it doesn't matter what the eth/meth ratio is, any amount
will help.
--
--
Martin Klingensmith
http://infoarchive.net/
http://nnytech.net/
Greg Harbican wrote:
In the last few days, I have been doing some checking, and I found that in
1990 there was experimentation into Eth / Meth alcohol mixes, that when added
to fuel, would increase the O2 content of the fuel up to 3.7% ( better than 11%
MTBE with 2% O2 ), decreasing associated pollutants.
Does anyone have any information about these experiments and what the
Eth/Meth ratio's are?
Greg H.
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