----- Original Message ----- From: "Andreas W Ohnsorge" <[EMAIL PROTECTED]>
> Tomas, > > I had a similar problem with WVO from a restaurant when I tried the > "foolproof recipe" allthough it worked fine with virgin oil. I had some > sort of success using the two stage acid based version with a recipe found > in the following website (but it requires titrating AND determination of > peroxide number): http://mars.wiz.uni-kassel.de/agt/biodiesel/rezept.html Greetings Andreas, The site you mentioned gives details for the calculation of methoxide compositions for the base/base two stage method, not the acid/base two stage method. Their calculator is interesting. I'm curious as to why they place so much emphasis on peroxide number instead of say the saturation of the oil/fat molecules. Definition of Peroxide Number: "The extent of oxidation that has taken place in a sample pf lipid or lipid fat can be expressed in terms of peroxide value." Haven't been able to find much about the expected levels of stored WVO/F. For fresh oils such as Hemp and Emu figures of 5meq/kg were quoted. Ran a few figures through the calculator, the methanol levels stay the same for all FFA and peroxide levels, its the KOH levels in the two stages that change A peroxide number of 10 made very little difference to the result Would be interesting to find out what figures could be expected for WVO/F stored for some time. One of the links that turned up dealt with preventing oxideation of oils, looks like rosemary comes up tops here. http://www.geocities.com/RainForest/4124/NSOres.html Regards Paul Gobert. ------------------------ Yahoo! Groups Sponsor ---------------------~--> Get A Free Psychic Reading! Your Online Answer To Life's Important Questions. http://us.click.yahoo.com/Lj3uPC/Me7FAA/uetFAA/FGYolB/TM ---------------------------------------------------------------------~-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://archive.nnytech.net/ Please do NOT send Unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
