- Original Message -
From: Keith Addison [EMAIL PROTECTED]
Subject: Re: [biofuels-biz] skin on biodiesel
Hi Paul, Michael
How do you maintain the heat during the processing hour, Paul?
Keith as this is trully a bucket method of temporary production I don't
maintain the 55 deg
, jugs, conc aqueous, low agitation, and
all, with some totally different feedstock oil...
Good luck!
Mark
At 07:11 PM 12/16/2002 +1000, you wrote:
- Original Message -
From: Keith Addison [EMAIL PROTECTED]
Subject: Re: [biofuels-biz] skin on biodiesel
Hi Paul, Michael
How do you
Thanks Paul,
I'll try to follow that up.
Currently in Thailand, we wash the BD made from stearin with almost indecent
haste.
Of course, if the skin comes from near the BD/glycerol interface, we should
suspect
methanol evaporating from the glycerol. So is the skin on the top of the BD or
- Original Message -
From: Michael Allen [EMAIL PROTECTED]
Subject: Re: [biofuels-biz] skin on biodiesel
Thanks Paul,
I'll try to follow that up.
Currently in Thailand, we wash the BD made from stearin with almost
indecent
haste.
Of course, if the skin comes from near the BD
indicate high levels
of unconverted materials? SG and viscosity testing won't necessarily
give you an indication of that.
Best
Keith
- Original Message -
From: Michael Allen [EMAIL PROTECTED]
Subject: Re: [biofuels-biz] skin on biodiesel
Thanks Paul,
I'll try to follow that up
If there are any drying oils present in the oil (such as linseed, fish or
flax-oil), oxidation of
the relevant unsaturated fatty acids can be expected to form a polymeric
film on the
biodiesel/air interface. It reforms every time the surface is broken until
it is all reacted with
the air. I
Paul,
Is tallow biodiesel more likely to form soaps? I always assumed that skin
is a sign of soaps, though I haven't made any fuel that skinned in a long
time. This would be washed out.
Mark
At 09:39 PM 12/11/2002 +1000, you wrote:
Michael,
have noticed that raw biodiesel from tallow readily
Lots of interesting chemistry coming out of this thread, but I do wonder
whether the answer might not be in the physics rather than the chemistry of
the process. Possibly the glycerol has not fully settled when the upper
layers of ester are syphoned off. Then, when the lower level is exposed to
- Original Message -
From: girl mark [EMAIL PROTECTED]
Paul,
Is tallow biodiesel more likely to form soaps? I always assumed that skin
is a sign of soaps, though I haven't made any fuel that skinned in a long
time. This would be washed out.
Mark
Mark, can't answer that one, have
The skin will be mono/diglycerides that have not been reacted. If you work it
out stoichometrically (using molar quantities from a known fatty acid profile)
your yield of products should be:
(Esters) minus (glycerol) minus (catalyst) minus (molar excess of MeOH).
So you if have less esters than
If it is mono and doglycerides you should be able to take some of the skin
and reprocess it with more methoxide and produce esters. If it is soap you
should not be able to do this. If it is tallow esters this test shouldn't
tell you much.
Mark
At 03:01 PM 12/12/2002 +, you wrote:
The
Michael Allen's question: What makes you so sure it is methyl stearate? Do
you have a reference for this perhaps?
This conclusion is one of my own drawn through my own experiences with
making biodiesel from waste oil. There is no research reference that I know
of. What do you think it is?
By
Padraig,
Thanks for the information.
We have a locomotive in Thailand running 300 kilometres a day on a 50:50 blend
of
biodiesel:petrodiesel. The biodiesel in primarily methyl stearate because it is
made from
the waxy solid stearin/palmitin that separates out of the olein in the palm
oil.
.
-Original Message-
From: Michael Allen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, December 11, 2002 7:43 PM
To: biofuels-biz@yahoogroups.com
Subject: Re: [biofuels-biz] skin on biodiesel
Padraig,
Thanks for the information.
We have a locomotive in Thailand running 300 kilometres a day on a 50:50
Michael,
have noticed that raw biodiesel from tallow readily forms a skin as it
cools, but the same BD after washing does not.
Paul Gobert.
Biofuels at Journey to Forever
http://journeytoforever.org/biofuel.html
Biofuel at WebConX
http://webconx.green-trust.org/2000/biofuel/biofuel.htm
List
15 matches
Mail list logo