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Re: Antioxidants
We are not the only ones who struggle with the oxidation of vegetable oil.
The food industry for one must take measures to address oxidation, and also I found today a paper discussing the use of vegetable oils as quenching oils in machine shops. http://qrc.fsb.hr/wp-content/uploads...Cavtat_-09.pdf
That paper found Ciba IRGANOX L 57 to be the best of the antioxidants for their purpose.
In the article at http://tinyurl.com/mtx6r8o relating to the food industry, they confirm our own observations:
"Oxidation ... is enhanced by prolonged or bad storage conditions of either crude oil or refined/bleached oil." referring to vegetable oil.
They also say the following, which will make sense to those with an understanding of chemistry - i.e. not me.
"The peroxide value (PV) is a good indication of oxidation, but as this test is empirical, the results are not stable regarding the test conditions. Since PV measures hydroperoxides (which are transitory), the test is supported by the p-Anisidine value (p-AV) to give a better view of oil oxidation. If a low p-AV (less than three) is found combined with a low PV, then it indicates there is no significant loss of natural antioxidant from the oil (Podmore, 1990; Oliver and Roland Meyer, 2004; Wong, 1989). Oil oxidation is usually characterized by the Totox (Total Oxidation) value that includes the results from the peroxide and the p-AV measurements (Patterson, 1994; Shahidi and Zhong, 2005; Shahidi and Wanasundara, 2002; Min and Hyung-Ok, 1999)."
There are also a series of charts at http://journeytoforever.org/biodiesel_yield.html#iodine and this one shows the iodine value or vegetable oils, which equates to it's oxidative stability - ie. the likelihood of you getting gunge in your tank.
There is an old thread that contains excellent commentary and also recommends IRGANOX L-57 antioxidant. Where to get it seems problematic.
http://www.biofuelsforum.com/threads...eed-oil-photos
A more recent thread is http://www.biofuelsforum.com/threads...lean-fuel-tank covering similar issues.
Any other updates?
Tim
We are not the only ones who struggle with the oxidation of vegetable oil.
The food industry for one must take measures to address oxidation, and also I found today a paper discussing the use of vegetable oils as quenching oils in machine shops. http://qrc.fsb.hr/wp-content/uploads...Cavtat_-09.pdf
That paper found Ciba IRGANOX L 57 to be the best of the antioxidants for their purpose.
In the article at http://tinyurl.com/mtx6r8o relating to the food industry, they confirm our own observations:
"Oxidation ... is enhanced by prolonged or bad storage conditions of either crude oil or refined/bleached oil." referring to vegetable oil.
They also say the following, which will make sense to those with an understanding of chemistry - i.e. not me.
"The peroxide value (PV) is a good indication of oxidation, but as this test is empirical, the results are not stable regarding the test conditions. Since PV measures hydroperoxides (which are transitory), the test is supported by the p-Anisidine value (p-AV) to give a better view of oil oxidation. If a low p-AV (less than three) is found combined with a low PV, then it indicates there is no significant loss of natural antioxidant from the oil (Podmore, 1990; Oliver and Roland Meyer, 2004; Wong, 1989). Oil oxidation is usually characterized by the Totox (Total Oxidation) value that includes the results from the peroxide and the p-AV measurements (Patterson, 1994; Shahidi and Zhong, 2005; Shahidi and Wanasundara, 2002; Min and Hyung-Ok, 1999)."
There are also a series of charts at http://journeytoforever.org/biodiesel_yield.html#iodine and this one shows the iodine value or vegetable oils, which equates to it's oxidative stability - ie. the likelihood of you getting gunge in your tank.
There is an old thread that contains excellent commentary and also recommends IRGANOX L-57 antioxidant. Where to get it seems problematic.
http://www.biofuelsforum.com/threads...eed-oil-photos
A more recent thread is http://www.biofuelsforum.com/threads...lean-fuel-tank covering similar issues.
Any other updates?
Tim
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