>Hello Folks, > >I have been following with interest the discussion about the FFA and the 2 >stage process. After going through Alec«s process and Canakci/Van Gerpen >study (I am not a chemist) a couple of questions have arrised. >How is the FFA % determined in the used oil and can it be done in a home >laboratory? >Is Alec«s process taking care of the FFA problem to an acceptable % ? > >bst rgds >Tomas
Hello Tomas First, I wouldn't take too much notice of the Canakci/Van Gerpen study. >>Some of us thought the Canakci-Van Gerpen paper was rather muddled >>and confused about a few things, such as what it said about the >>"interphase". I wasn't too persuaded by the main drift of the >>paper. Loads of methanol, loads of acid, all those stages - can it >>possibly be worth it? I'd had quite a high opinion of Van Gerpen's >>work before reading this paper, but it took a nosedive. Better stick to Aleks's method. >How is the FFA % determined in the used oil and can it be done in a home >laboratory? Unless your oil is very unusual, you don't really need to know the FFA content for the acid-base method, but quite a few people (me included) think it's worth knowing anyway. See: "Basic titration" http://journeytoforever.org/biodiesel_make2.html#titrate And: "Better titration" http://journeytoforever.org/biodiesel_make2.html#bettertitrate Most of the high-FFA two-stage discussion was at the Biofuels-biz group, especially concerning Michael Allen's work with crude palm-oil. Do an archive search for "Allen" and follow the "hi ffa feed stocks" thread and associated threads. Very interesting. http://archive.nnytech.net/index.php?list=biofuels-biz By the way, did you manage to develop a greywater system for handling the washwater? Best wishes Keith 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/
