----- Original Message ----- From: Keith Addison <[EMAIL PROTECTED]> To: <biofuels-biz@yahoogroups.com> Sent: Wednesday, September 25, 2002 11:02 AM Subject: [biofuels-biz] Fwd: [Biodiesel] Re: liquid glycerine?
> Pardon me, but this below is crap, is it not? It's the fatty acid > portion that's saturated or unsaturated, not the glycerine portion. > Or could this be the result of poor processing and an incomplete > reaction? > > Thanks! > > Keith > > > >Just as important as the amount of FFA's is what the oil actually is > >made from. If the oil is normally solid at room temp such as tallow, > >the glycerine will go solid much quicker than glycerine from oil that > >is normally liquid at room temp such as canola. > > > >Even if it is new oil in both cases. > Keith My experience with a variety of feedstocks bears out the above statement. Just made some BD from used tallow which titrated at 2ml 1% NaOH. Low acidity and the glycerine still set solid by the next day. A mixture of the same tallow plus soy oil plus hydrogenated vegetable oil gave glycerine which was liquid the next day . The saturation would as you say be related to the fatty acid portion of the molecule. The tendency to solidify could have something to do with the increased chain length of the tallow giving rise to higher melting point byproduct contaminants in the glycerine. But this is only a guess. As Todd posted high FFA WVO/WAF need a higher level of NaOH to neutralise them resulting in increased soap levels. A comparison of glycerines from both the acid/base method and the single stage base method (from same High FFA feedstock) would indicate whether the FFA neutralisation by NaOH led to solidification of the glycerine. Regards, Paul Gobert. ------------------------ Yahoo! Groups Sponsor ---------------------~--> Sell a Home for Top $ http://us.click.yahoo.com/RrPZMC/jTmEAA/MVfIAA/9bTolB/TM ---------------------------------------------------------------------~-> Biofuels at Journey to Forever http://journeytoforever.org/biofuel.html Biofuel at WebConX http://www.webconx.dns2go.com/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/
