Thank You for the reply Todd. Hmmm i might not have been very clear about what happened. Data about titration and some pictures of it all is here: http://user.tninet.se/~qrg733j/Krympta/Snoddastest_1.html
The fluff appeared when i shaked the "wash test" (violent shake of BD with water) bottle again the day after the initial "wash test" (the first test described in the pictures) was performed. So the fluff did not appear until the test bottle with the same water and the same BD had been shaken again after about 24 hours of separation after the real test. I will go to my hot dog shop and get some fresh sample of their oil and make the suggested tests and experiments. Everything that makes things clear in front of my eyes makes it easier to understand any coming problems wich will come some day i imagine..... The oil is a mix of rape and palm oil, i have tried to get some answers about it from the supplier but there is quite a bit of secrets around it.... All i know about the oil mix is that it is "partly hardened" and contains citric acid to prevent oxidation. The fat is roughly 18% "saturated", 76% "single unsaturated" and 6% "double unsaturated". They change oil in the fryer a little bit more often than once a week, i do not know if that makes it a very used oil.... Thanks again Lars A Lars Andersson VŠstanskogsgatan 7 590 71 Ljungsbro 013-66574/070-5334054 ----- Original Message ----- From: "Appal Energy" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, February 15, 2005 7:28 AM Subject: Re: [Biofuel] Fw: Test batch no. 2 > Lars, > > "Fluff" at the interphase layer of water and biodiesel upon the first wash > stage isn't exactly what you want to see. If the reaction has gone to > completion, you have let the fuel/glyc-cocktail set overnight or perhaps 24 > hours and you didn't transfer any of the glyc cocktail into your wash, the > interphase layer should be a very clean separation, with but a paper-thin > layer of white between water and fuel. > > Just exactly what did the oil titrate at before you started? Three > possibilities are that either the reaction failed to complete, or it's a > very degraded oil that generated a grand amount of soap and you didn't let > the glyc cocktail settle out for a long enough period of time, or a > combination of both. > > It's also possible that the oil is borderline, so degraded and high in FFAs > (eventually soap) that you're always going to have problems with it. > > The suggestion here is to slow down and figure this one out before you move > on to 100 liters. > > If your able, secure one or two liters of virgin veg oil. Run side-by-side > samples of that and a half-dozen blends of the SVO and the feedstock you're > having trouble with. (perhaps 15%, 30%, 45%, 60%, 75% and 90%) Two hundred > milliliters of oil at a time will be sufficient, all of them preferably in > identical jars. "Pint" canning jars work lovely. Use a water bath to keep > the temp elevated while the contents are reacting. Shake each jar violently > for perhaps 10 seconds, every five minutes, for 20 minutes. > > When working with such small volumes it helps to use a stock methoxide > solution and dilute it as necessary for each sample using pure methanol. > This is a much more accurate and quicker method than weighing out > micro-amounts of catalyst for each and every sample. See > http://journeytoforever.org/biodiesel_make2.html#stockmeth > > Take note of everything you do. As you progress towards the samples with the > high percentage of crappy oil (?) some of the characteristics you've already > experienced should start popping up, providing that the problem rests with > the oil and not previous operator error. > > When you go to washing some of each sample, pour off 50 ml of each into > separate jars, making sure not to get any glyc cocktail in with the fuel. > Add 50 ml of warm/tepid water. Close the lid tightly and either swirl > quickly for ten seconds or just shake violently three or four times. Set the > jars down, let settle and observe. > > What you see shuld start providing answers to some of your questions. > > There is one other set of tests that could help you gather a better > understanding of what gives. Take a liter of fairly clean oil. Titrate it. > Put 200 ml of the oil in each of five identical jars. In the center sample > use the appropriate amount of methoxide that your titration dictates. In the > two samples to the left use an amount of catalyst equivalent to 1/2 gram per > liter of oil and 1 gram per liter of oil less than what the titration > indicates. On the two samples to the right, go in the opposite direction > with 1/2 and 1.0 grams more, respectively, than the titration indicates. > Close the lids tightly and agitate in the same manner as the test mentioned > above. Wash 50 ml samples, also in the same manner as in the test above. > > Observe. > > This side-by-side "bracket titration" will give you a visual understanding > of what too little catalyst can do to a wash. You might find some reasonable > parallels to the problems you're presently having. > > Todd Swearingen _______________________________________________ Biofuel mailing list [EMAIL PROTECTED] http://wwia.org/mailman/listinfo.cgi/biofuel Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuel archives at Infoarchive.net (searchable): http://infoarchive.net/sgroup/biofuel/
