----- Original Message ----- From: Keith Addison <[EMAIL PROTECTED]> To: <biofuels-biz@yahoogroups.com> Sent: Sunday, September 15, 2002 2:03 PM Subject: Re: [biofuels-biz] High FFA oils - another way
> Hello Paul <snip> > >----- Original Message ----- Paul wrote> >Mix the lime into the WVO/BD and heat with occasional stirring to 100 deg C. > >The lime appears to dissolve in WVO as heated but is probably just held in > >suspension. > >Cool decant and filter. No problems with ammount of lime just use excess. Forgot to mention that it is best to make a slurry of the lime and a small volume of WVO, then add this to WVO. > Thanks Paul, I'll try that. But this caustic refining step is so easy > I'm quite satisfied with it, and there's no need for heat, for > filtering, or for anything you haven't already got. > > "... just use excess" - about how much per litre? Be guided by the titration. 1g NaOH is equivalent in reaction to 1.08g Ca(OH)2 > >Would much rather go acid/base with feedstock with FFA content this high, > > Sure, as I said, but a lot of people don't do acid-base. Also, > acid-base doesn't like this particular oil, it has a lot of salt in > it (tempura oil). Hot pre-washing solves that problem, but that then > makes the acid-base process a lot more trouble than this, and a lot > more energy use, so you're left to choose between much more time and > hassle for the acid-base advantages, or a quick and easy way like > this, and there's not much in it. Especially since I think recovered > FFAs are useful, not wastage. You're not using more methanol, the > extra lye isn't expensive, so it's really just some extra phosphoric, > no big deal, as against no sulphuric. Interesting I didn't think of the salt content. > >less wastage/recovery > > "It's an alternative - better than straight single-stage base for oil > like this, and while it won't get as a high a production rate as > acid-base, and it uses more catalyst and gives you more co-products, > it's very quick and simple, and the product is good." > > >and acid stage allows alcohols other than methanol or > >ethanol to be used. Isopropanol for instance has the potential to reduce > >cloudpoint. > > Have you tried the acid-base process with isopropynol? That'll make > branched alkyl esters, low cloud-point yes, but I don't know of > anyone that's had any success with isopropynol or butyl other than > with enzymes, though I do know people who've tried. Reference > previously posted in "Cracking" thread, Foglia et al, for instance. > Pressure maybe. Have to dig through my records, intended to try acid/base with isoprop in acid stage but can't remember whether I got around to it. isopropanol definitely doesn't seem to want to work for transesterification. I think Aleks was working on BD using either isopropanol or butanol. > > Best wishes > > Keith > > Regards, Paul Gobert ------------------------ Yahoo! Groups Sponsor ---------------------~--> 4 DVDs Free +s&p Join Now http://us.click.yahoo.com/pt6YBB/NXiEAA/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/
