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 +0000, you wrote: >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/ 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/
