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 a predited (molar) yield of esters with skin forming you are therefore running sub-optimally. Diglycerides should be soluble in the ester layer, monoglycerides solubilise in water. Dave rpg wrote: > ----- 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 noticed skinning on BD from both veg oil > and animal fat, but have not compared levels. Did notice however that the > skin will redissolve if stirred back in. Skin even washes ok. > > Remember some time back I was posting about the thickish white layer between > BD and wash water on settling after mist washing. You asked what made me > think it was not emulsion. Turns out it was emulsion, a sample of it is > separating to BD, smaller intermediate layer and water after standing for > about a month. Origionally sampled it with intent of getting it analysed, no > need now. > > Regards, 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 messages are archived at the Info-Archive at NNYTech: > http://archive.nnytech.net/ > To unsubscribe from this group, send an email to: > [EMAIL PROTECTED] > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ -- David Preskett, BSc (Hons.), AIWSc [EMAIL PROTECTED] Reduce - reuse - recycle University of Wales BioComposites Centre Deiniol Road Bangor Gwynedd LL57 2UW http://www.bc.bangor.ac.uk Tel +44 (0)1248-370588 Fax: +44 (0)1248-370594 Biofuels at Journey to Forever http://journeytoforever.org/biofuel.html Biofuel at WebConX http://webconx.green-trust.org/2000/biofuel/biofuel.htm List messages are archived at the Info-Archive at NNYTech: http://archive.nnytech.net/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
