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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Yes, there are a zillion alcohols – don’t forget
glycerol, which has 3 –OH’s in one molecule! And yes, some
are formed during fermentation, but there tends to be less of each, the longer
the carbon chain. You will get a bit of propanol (“rubbing alcohol”)
less butanol (“butyl alcohol”), less still pentanol (“amyl
alcohol”) and so on. These make up a large fraction of “fusel
oil” left over after you have redistilled the crude ethanol you first get
from the fermentate – and the fact that it is referred to as an oil warns
you that it is not too good a fuel. It is quite difficult to get it to combust
cleanly, and if you don’t, you land up with a lot of aldehydes and other
nasties in the air which smell terrible (fusel oil itself is pretty grungy
smelling). Many of these higher alcohols metabolise with difficulty, meaning
they are a bit poisonous, as the body can’t get rid of them easily –
which is why alcohol for drinking is usually distilled at least twice (to minimize
the residual fusel oil in the product) if you go for batch distillation.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hope that helps<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Prof Philip Lloyd</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Energy Institute</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Cape Peninsula University of Technology</span><span
style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>PO Box 652, Cape Town 8000</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Tel:021 460 4216</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Fax:021 460 3828</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Cell: 083 441 5247</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'><a href="mailto:lloydp@cput.ac.za">lloydp@cput.ac.za</a></span><span
style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> Stoves
[mailto:stoves-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Crispin
Pembert-Pigott<br>
<b>Sent:</b> 16 April 2014 07:15<br>
<b>To:</b> 'Discussion of biomass cooking stoves'<br>
<b>Subject:</b> Re: [Stoves] Leftover alcohol.......was Re: Char from coir Re:
Biochar Inquiry<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dear Paul<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I was contacted by Simunye looking for a way to turn these
alcohols into some form of a useful product. As I recall there were 112 types
of ‘-ol’. I did not realise there were so many different ways to
connect an OH to a carbon construct.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>So methanol and ethanol are two of them, and there are a huge
number of others that are formed during fermentation. I think perhaps Prof
Lloyd is the right person to make a comment on what they are and (perhaps) how
dangerous they are as domestic fuels.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>All it means from a practical point of view is they have
difference boiling points so they are separated from the main products.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regards<br>
Crispin<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-CA><o:p> </o:p></span></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-CA>Crispin,<br>
<br>
Please provide more info (or links) about the LEFTOVER alcohols from ethanol
refining.<br>
<br>
Paul<br>
<br>
<o:p></o:p></span></p>
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