Hello Duncan, Jan, Karn >Hi Jan, > >In your mail Karn you said: > > Since you know the citric acid content, it will be easy to calculate the > > actual FFA value from the titration value. > >Given a FFA value (x) I've determined this empirical relationship >(y=1.947x+3.5 - from values I got here >http://asae.frymulti.com/abstract.asp?aid=4209&t=2 for different feedstock)
That paper is not held in very high regard. http://www.mail-archive.com/cgi-bin/htsearch?method=and&format=short&c onfig=biofuel_sustainablelists_org&restrict=&exclude=&words=Canakci Or: http://snipurl.com/hh08 Search results for 'Canakci' >to determine the number of grams KOH to add for acid/bass process. What grade KOH, 92% or 85%? t's figured out here: http://journeytoforever.org/biodiesel_make2.html#lye Make your own biodiesel - page 2: More about lye >The FFA% >appears to be about half the number of ml of 0.1% w/v KOH solution. Is this >correct? One of my suppliers gives me the FFA value - I'm busy checking this >with my own titrations and will use there FFA value + equation instead of >titration in the future. Why do you assume that the FFA% is the same as the acid level that you'll need to neutralise? I don't know if it is or not, but I don't think it is. Anyway, how will you figure how much of the FFA was esterified in the acid stage and therefore how much is left for the base stage to handle from the quantity of FFA (never mind which FFA) in the unprocessed oil? It all seems very roundabout to me. There are more simple and direct and effective ways of doing this, quite a few of them, I'm doing some of them even as we speak, or rather the processor is. Why don't you try going in exactly the opposite direction? It's not just a single-stage base transesterification with an extra acid stage tagged on the front. You need to look at it sideways. Bedst wishes Keith >Regards, > >Duncan _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
