I have some oil from a small pizza shop; it's real dark and it titrates at about 11. I was going to just add some to each batch of 'better' oil to use it - thinning it out like that should be ok, right?
PS - Thanks to all those that helped me along the way. It looks like all the 'problems' I was having was nothing more than a little glycerine at the bottom of the separation funnel, settling after draining the majority of it out. Just a little sticking to the walls I guess. The last two batches couldn't have come out better now that I know what to look for. Ken Provost wrote: > On May 6, 2008, at 8:45 AM, Brian Schneider wrote: > > >> Jan, >> You say that my concentration is very weak compared >> to the standard solutions. Do you mean the standard >> solution to titrate waste oil with, or are you just meaning >> weak in general? If it is weak compared to what should >> be used for waste oil, what is the standard strength? >> > > > 0.1% NaOH solution is what many people use for titration, > including me. As Jan points out, you should be titrating > just one ml of your oil in enough isopropyl alcohol to > dissolve any free fatty acids (10 ml of isopropanol is fine, > but not critical). > > If this is your procedure, your 12-15 titration result is valid. > Quite high (worse than anything I've ever used), but lots of > folks get oil like that regularly. The normal single-stage > base-catalyzed process would make lots of soap, likely > reducing your yield drastically. > > A combination acid-base process could work, but I wouldn't > recommend it for a novice. You could try to get some cleaner > oil titrating at, say, 1 or 2 ml, and mix in some of the rancid > stuff to use it up gradually. Virgin oil, except palm and olive, > would typically titrate somewhere between 0 and 1 ml. > > _______________________________________________ > Biofuel mailing list > Biofuel@sustainablelists.org > http://sustainablelists.org/mailman/listinfo/sustainablelorgbiofuel > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Search the combined Biofuel and Biofuels-biz list archives (70,000 messages): > http://www.mail-archive.com/biofuel@sustainablelists.org/ > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: /pipermail/attachments/20080506/981085f9/attachment.html _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/sustainablelorgbiofuel Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (70,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
