Hello Peter. You forgot the first signs of the formula. It should be: 1 - m1/m2 = m3 In your case: 1 - 25/225 = 0,8888..... There is also a definition error in the formula. m1 = the amount of undissolved material m2 = the amount of biodiesel put into the reaction m3= The amount of biodiesel that is dissolved in methanol in mass% Sorry about that.
The proportions between methanol and biodiesel is carefully balanced in order to make the test reproducable. Best regards Jan ----- Original Message ----- From: "Guag Meister" <[EMAIL PROTECTED]> To: <biofuel@sustainablelists.org> Sent: Tuesday, June 05, 2007 3:33 AM Subject: Re: [Biofuel] Meth test (was Off topic) > Hi Keith and Jan ; > > I read this with interest but I am quite confused. > Please can we start by exlaining the underlying basis > for this test?? Is it that unreacted oil will not > dissolve in methanol? Are we trying to dissolve the > FAME in methanol and measure the remaining?? If we > are, then why is it so important to measure exactly > 225g methanol. Why wouldn't 250g be OK for example?? > I can understand exactly 25g of biodiesel is > necessary, but why exactly 225g methanol? Perhaps I > missed this in a previous post. > > Then when I try an example with your formula I again > get confused. Let's say we have perfect biodiesel. So > this means all of if will dissolve in the methanol, > right? > > By your formula : > > m3=m1/m2 > m3=25g/225g > m3= 0.11111 > > So 0.111 is how much of the FAME is methyl esters for > perfect FAME? What does this mean?? > > Best Regards, > > Peter G. > Thailand > > --- Keith Addison <[EMAIL PROTECTED]> wrote: > >> Greetings Jan >> >> Sorry for the late reply. >> >> Just to add my vote of thanks - the methanol test is >> simple and >> useful, it's helped a lot of people. >> >> I'd like to add this development to the quality >> testing section at >> Journey to Forever, would you agree? >> >> All best >> >> Keith >> >> >> >Dear all. I am very flattered that my methanol >> method had so much >> >attention. Here is a development of the method: >> > >> >Equipment needed for the analysis >> > >> >1. One 250 ml separatory funnel >> >2. One 400 ml beaker (Figure 2) >> >3. One magnetic stirrer >> >4. Balancer with 0,05g acc. >> >5. One 50 ml narrowed neck E-flask >> > >> >Chemicals for the analysis >> > >> >1. Water free methanol, min 225 g >> >2. FAME with water content less than 500 ppm, >> clear, bright and >> >without visible impurities, min 25 g >> > >> >Take the clean beaker and put exactly 225 g of >> methanol in it. Then >> >add exactly 25g of the biodiesel. Stir the fluids >> on the stirrer for >> >2 minutes. Take the beaker off the stirrer ans pour >> the content into >> >the separation funnel.Take the clean e-flask to the >> balancer and >> >tarate with the flask. Let any oil phase separate >> out from the >> >biodiesel/methanol phase and put it in the >> e-flask. Weigh the >> >content and calculate the result: >> > >> >1 - m1/m2 = m3 >> >where m1 is the mass of the biodiesel >> >m2 is the amount of methanol >> >m3 is how much of the biodiesel put in that is >> consisting from methyl esters. >> >The method will show huch much of the material by >> mass that is >> >soluble in methanol. This includes mostl mono- and >> diglycerides. The >> >residue consists therefore mostly from unreacted >> oil. >> > >> >With best >> >Jan Warnqvist >> >> >> _______________________________________________ >> Biofuel mailing list >> Biofuel@sustainablelists.org >> > http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org >> >> Biofuel at Journey to Forever: >> http://journeytoforever.org/biofuel.html >> >> Search the combined Biofuel and Biofuels-biz list >> archives (50,000 messages): >> > http://www.mail-archive.com/biofuel@sustainablelists.org/ >> >> > > > > > ____________________________________________________________________________________ > Be a better Heartthrob. Get better relationship answers from someone who > knows. Yahoo! Answers - Check it out. > http://answers.yahoo.com/dir/?link=list&sid=396545433 > > _______________________________________________ > Biofuel mailing list > Biofuel@sustainablelists.org > http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Search the combined Biofuel and Biofuels-biz list archives (50,000 > messages): > http://www.mail-archive.com/biofuel@sustainablelists.org/ > > > _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
