Re: [biofuels-biz] skin on biodiesel

2002-12-16 Thread rpg
- 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

Re: [biofuels-biz] skin on biodiesel/suggestions

2002-12-16 Thread girl mark
, 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

Re: [biofuels-biz] skin on biodiesel

2002-12-15 Thread Michael Allen
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

Re: [biofuels-biz] skin on biodiesel

2002-12-15 Thread rpg
- 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

Re: [biofuels-biz] skin on biodiesel

2002-12-15 Thread Keith Addison
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

[biofuels-biz] skin on biodiesel

2002-12-12 Thread goat industries
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

Re: [biofuels-biz] skin on biodiesel

2002-12-12 Thread girl mark
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

Re: [biofuels-biz] skin on biodiesel

2002-12-12 Thread David Teal
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

Re: [biofuels-biz] skin on biodiesel

2002-12-12 Thread rpg
- 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

[biofuels-biz] Skin on biodiesel

2002-12-12 Thread David Preskett
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

Re: [biofuels-biz] Skin on biodiesel

2002-12-12 Thread girl mark
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

[biofuels-biz] skin on biodiesel

2002-12-11 Thread goat industries
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

Re: [biofuels-biz] skin on biodiesel

2002-12-11 Thread Michael Allen
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.

RE: [biofuels-biz] skin on biodiesel

2002-12-11 Thread Wendell Wait
. -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

Re: [biofuels-biz] skin on biodiesel

2002-12-11 Thread rpg
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