> >if there is FFA present in the waste oil, and both of them undergo > >the transesterification, where will the unreacted FFA be present? > >will the excess methanol and the lye be present all in the glycerine > >layer? why?
FFAs undergo saponification (soap making). The glycerides undergo transesterification. The saponification takes place first and consumes catalyst, leaving no unreacted FFAs. If the FFA content of the parent oil is not calculated properly and too little catalyst is used, the transesterification reaction will not go to completion. Glycerol and methyl esters (biodiesel) are both solvent in methanol, meaning that the methanol will reside in both products. Some free catalyst will remain in the biodiesel layer. The majority of the catalyst will reside in the glycerol cocktail layer bound up as soap. > >FFA reacts with the sodium hydroxide to produce COONa + water? is > >it correct? if its true, where will these products formed be at? the > >ester region or the glyerine layer? The small amount of water that is formed will primarily reside in the glycerol cocktail layer, as glycerol is far more solvent in water than is biodiesel. Todd Swearingen ----- Original Message ----- From: "ophelia~" <[EMAIL PROTECTED]> To: <biofuel@yahoogroups.com> Sent: Monday, August 30, 2004 8:27 AM Subject: [biofuel] Transesterfication > hi ppl... > > can anyone answer my questions?? thanks > > for the tranesterification, > > > >if there is FFA present in the waste oil, and both of them undergo > >the transesterification, where will the unreacted FFA be present? > >will the excess methanol and the lye be present all in the glycerine > >layer? why? > > > >FFA reacts with the sodium hydroxide to produce COONa + water? is > >it correct? if its true, where will these products formed be at? the > >ester region or the glyerine layer? > > Yahoo! Messenger > - Log on with your mobile phone! > > [Non-text portions of this message have been removed] > > > > > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Biofuels list archives: > http://infoarchive.net/sgroup/biofuel/ > > Please do NOT send Unsubscribe messages to the list address. > To unsubscribe, send an email to: > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar. Now with Pop-Up Blocker. Get it for free! http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://infoarchive.net/sgroup/biofuel/ Please do NOT send Unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/biofuel/ <*> 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/
