>Still in regard to FFA, I will be blending in some wvo to bring the >levels down to a more managable level. > >Would most appreciate any indication of maximum ffa level that could >be handled by a 2-stage acid-base reaction, at standard pressure/60 >degrees C (to minimise capital/running costs). > >Thanks, >Mike Jureidini
Interesting to know, Mike. People don't usually encounter such stuff as yours. For instance, this is from "Biodiesel Production Technology Overview", from the NBB: "Spent frying oils have high levels (5 to 15%) of free fatty acids, which are natural degradation products of oils..." http://www.biodiesel.org/resources/reportsdatabase/reports/gen/gen-004.pdf I have quite a lot of recovered FFAs and I guess I could do a whole series of tests with the acid-base method adding more and more FFAs until it didn't work anymore, but I'm not very keen to do that. Why don't you do it in reverse? You know what you're starting with, do small batches, add virgin oil to bring the FFA-level down, rather than complicating it with WVO containing higher FFA levels already. If you're not yet familiar with the acid-base process, better do that first - small batches, start with virgin oil, then standard (normal?) WVO, then keep going, as Todd suggested. (Please keep us informed.) But if you're going to have to bring it down to only 15%, or even twice that, would it be worth it? maybe they should just clean that stuff up a bit and sell it as soapstock or foots. Best Keith >--- In [EMAIL PROTECTED], Michael Allen <[EMAIL PROTECTED]> wrote: > > Hi David, > > > > [EMAIL PROTECTED] is running a research project > > on transesterification of beef tallow. I'm not sure he > > has heaps of results from his enzymatic process yet > > but he certainly has references to all the literature > > you need. (Mohammed is an Associate Professor of > > Chemical Engineering at the University of Auckland in > > New Zealand) > > > > We are making commercial quantities (1 tonne/day)of > > biodiesel by transesterifying stearin from palm oil. > > Indeed, one of the Thai railways routes from Hadyai to > > Sungei Golok is using a B50 blend of our stuff with > > petro diesel in their 150km run every day. > > > > At the moment I have built a 120 litre deep bed unit > > for working on a crude palm oil feedstock with the > > methoxide introduced at the bottom. We have lots of > > stearin and palmitin (lard!) floating in the olein > > liquid (and large amounts of free fatty acids) so we > > have to run the reactor at 60C. This temperature is > > close enough to the boiling point of methanol that we > > have to recover the excess methanol to make the > > process economic. > > > > I imagine you would have to do the same with lard. > > > > Lots of luck > > > > Michael Allen > > Visiting Professor > > Prince of Songkla University > > Thailand > > --- David Teal <[EMAIL PROTECTED]> wrote: > > > In Scotland, chip shops use lard (animal fat). Last > > > week I took a quantity > > > of such material and tried (admittedly without much > > > confidence) using the > > > same procedure as for WVO (2 stage base). Nothing > > > doing, as expected. I > > > was hoping Aleks' acid/base method would be the > > > answer, but from Todd's > > > reply we might need HTP. Any experience with lard > > > anyone? > > > > > > David T. ------------------------ Yahoo! Groups Sponsor ---------------------~--> 4 DVDs Free +s&p Join Now http://us.click.yahoo.com/pt6YBB/NXiEAA/mG3HAA/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/
