Hello, In relation to the storage issues, from our experience it may not be much of an issue at all at the commercial level we opened up a drum from our first reactor that was 4 years old a couple of weeks ago 45 gallons of it, it had been sitting outside in a steel drum with approximatly 5 inches of airspace over the esters (55 gal drum) so it has been through some record breaking winters and several high heat cycles unattended. even though this was a unintentional test is showing us some things. this batch was 50% soy 50% wvo procesessed at the same time. supprised us... there was a little bit of cloudyness but not much at all, which was easilly removed by simply stirring one of our trucks has run almost a week on it with no change in performance from the freshest batch perhaps it may be as easy as dilution, with fresh.. when you pull up to your customers tank, run theirs through a pump as you add your fresh. perhaps run it through a coalescing filter that you have mounted on your truck to remove any molecular water just wondering, does anyone know of anyone using biodiesel that lets it sit in their tanks for more than a month or 2? I don't except for some standby generators but I have not been able to arrange any contracts with them yet (eg ameritec) so I dont know the inside scoop from what I understand part of their maintenance is to replace the fuel every 6 months anyways
On Mon, 26 Jul 2004 16:14:38 EDT, [EMAIL PROTECTED] wrote: *Hello again, * *Dr. Jon Van Gerpen taught a course segment on the oxidation issue. He has *charts that show a doubling of storage life of vegetable oil with an antioxidant. *Most of these studies have been done on vegetable oil or lard to date, but *should translate in some degree to biodiesel. The more effective stabilizers *have chelators which help tie up free metals, such as copper that catalyze *oxidation. * *The amount of antioxidant is more than a few ppm, I guess, since it is 0.01%, *which translates to 100 ppm, as you say. This has been shown to reduce *oxidation 20 fold. * *Americans are not so concerned with polymerization as are the Europeans, *although I'm not sure that should be so. I don't know how these chemicals affect *this lacquer effect. * *I was talking about measuring the peroxide content as a measure of oxidation. * As with most technical details, there are various levels one can work with, *and until my operation is in production, which is planned for by next spring, *I intend to work on the basics: keep it dry, sell it fast, add some standard *preservatives, inform your customers about how to handle it, and learn from *experience. I wish someone else who is doing this right now was telling us how *it all works, but we are still earlier in our learning process. * *Tom Leue * * *In a message dated 7/26/04 2:09:20 PM, [EMAIL PROTECTED] writes: * * *> Hello Tom, Lurch *> *> >The most effective antioxidants for biodiesel are the same you find in *> >breakfast cereal packaging, namely BHA and BHT. A mixture of the *> >two works even *> >better. Now you can buy premixed antioxidants from companies such as Kodak. *> It *> >only takes a few ppm to make a dramatic impact on shelf life of biodiesel. *> >For you natural granola types, citric acid can easily double the shelf life *> of *> >biodiesel. *> *> Do you have any further information on this? Or have you tried it? In *> Europe, where the new Euro standard has tough Oxidation stability *> limits, people are using anti-oxidants specifically made for *> biodiesel, and they say the food additives, and even the edible oil *> anti-oxidants (usually synthetic vitamins) are not suitable. This is *> commercial-level stuff, usually sold by the IBC (intermediate bulk *> container - 1000 litres), it's expensive, and the manufacturers keep *> the formulas to themselves. *> *> It's usually added at 200-300 ppm volumetric. The anti-ox additive *> must be injected into the finished fuel right after production. You *> have about 8 hours to wash and dry before the anti-ox injection. The *> injection should be done without splashing. And obviously *> bubble-washing and bubble-drying are out, not just because of the *> time factor but because they both oxidise the fuel. *> *> The purpose of this isn't so much to increase storage life and deter *> biological activity as to prevent the cross-bridging and *> polymerisation caused by oxidation. Rapeseed oil is probably the most *> common feedstock there, polymerisation is said to be a concern with *> rapeseed oil, and it has a lower Iodine Value than America's soy oil *> does. Both are classed as "semi-drying" oils. *> *> >The most effective method is to keep it in an airtight container. *> *> Biodiesel is also unstable in light. Keep it in a dark place. *> *> >Also, dry biodiesel is far more stable. *> *> Maybe as far as biological activity is concerned, but I don't think *> water content has any effect on cross-bridging. *> *> >If this is not possible, such as *> >being in a standard fuel tank somewhere which must be vented, then the NBB *> >recommends using the biodiesel within 6 months. *> *> If polymerisation is a concern, and I believe it is a concern, it *> will start to polymerise much sooner than that, especially if it's *> been bubble-washed, unless it's derived from low-Iodine Value *> feedstock or has been treated in time with a suitable antioxidant. *> *> >These preservatives will make this *> >last two to four times as long without serious oxidation. *> *> Hm. Again, do you have any references for this? *> *> >You should also *> >know that biodiesel made from recycled yellow grease lasts *> >approximately twice as *> >long as biodiesel made from virgin soy oil. *> *> I've heard that a couple of times and have never been able to track *> it down. Also I can't see why that should be so. Can you shed some *> further light on this? What quite do you means by "lasts" and "shelf *> life"? That it doesn't biodegrade as quickly? *> *> I'm not sure, but I suspect that sufficient citric acid to prevent *> oxidation and cross-bridging in semi-drying oils might result in *> problems meeting the Acid Value levels set in the standards. *> *> Best wishes *> *> Keith Addison *> *> *> >Tom Leue *> > *> > *> >In a message dated 7/24/04 5:09:04 PM, [EMAIL PROTECTED] writes: *> > *> > *> > > Anyone had any experience using some inert gas such as nitrogen to *> prevent *> > > oxidation of stored biodiesel? Perhaps some sort of oxygen absorber? If *> > > there *> > > isn't any oxygen in contact with the biodiesel perhaps it would increase *> > > storage *> > > life.How might this affect algae growth? *> > > *> > > Lurch *> * * * * * * *----------------------------- *Homestead Inc. *www.yellowbiodiesel.com * * * *[Non-text portions of this message have been removed] * * * * * *Biofuel at Journey to Forever: *http://journeytoforever.org/biofuel.html * *Biofuels list archives: *http://infoarchive.net/sgroup/biofuel/ * *Please do NOT send Unsubscribe messages to the list address. *To unsubscribe, send an email to: [EMAIL PROTECTED] *Yahoo! Groups Links * * * * * [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar. Now with Pop-Up Blocker. 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