Keith Addison
<[EMAIL PROTECTED] To: biofuel@egroups.com
rever.org> cc:
Subject: [biofuel] FFA
05.12.2000 20:47
Please respond to
biofuel
FFA can probably be acid catalysed. I've not tried this, but the basic
recipe
has been looked at by an analytical chemist who thinks it should work.
Again : this is called the Fisher esterification process. Please don't try
this @ home if non-chemists. Sulph acid heats up nasty while diluting and
is the
cause for many_a_plastic_surgery. Fumes of that acid are highly corrosive
and toxic
(SO3).
Acid catalysis is a water tolerant process. Use 10% methanol mixed
with 2% to 3%
concentrated sulphuric acid (or double that of 50% acid). Mix with the oil
and
stir regularly for at least 24 hours.
That is time and material lost. In oreder to get any result at all, the
Methanol
overdose has to be 5 to 7 fold the stoichiometric value. That one is tryed
out.
And to finnish, washing is a real bitch.
Then leave to settle. Conversion rate is
often poor (like 50%), but it is using a material that otherwise can't be
made
into biodiesel. Ester should rise to the top of tank. It may work with less
nasty acids, but we have to begin somewhere. Acetic and citric may be too
weak.
Phosphoric may be OK.
Does not work with any other acids than H2SO4.
Cheers, Aleks
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