Cooking in oil that has been used a long time is unhealthy, due to the
amount of free fatty acids that build up in the oil.

The process of making biodiesel removes these free fatty acids, and
converts them to a form that can be removed by washing the oil.
Washed biodiesel has no free methanol, near zero FFA, and no NaoH.

Can you then, instead of putting the biodiesel in a vehicle, simply
replace it back in the deep fryer, and cook with it?

Ian Stirling wrote:
Cooking in oil that has been used a long time is unhealthy, due to the
amount of free fatty acids that build up in the oil.

The process of making biodiesel removes these free fatty acids, and
converts them to a form that can be removed by washing the oil.
Washed biodiesel has no free methanol, near zero FFA, and no NaoH.

Can you then, instead of putting the biodiesel in a vehicle, simply
replace it back in the deep fryer, and cook with it?


I believe the flash point is way too low. I also dunno what the stuff
tastes like.

Bob

Ian Stirling schrieb:
Cooking in oil that has been used a long time is unhealthy, due to the
amount of free fatty acids that build up in the oil.

Researchers from the University of Hohenheim (Germany) have
recently developed a stove (named Protos) that runs on vegetable oil.
If I understand the article correctly, the secret is
a tube that vaporized the oil before it is burned.

http://www.spiegel.de/wissenschaft/m...413807,00.html
http://www.uni-hohenheim.de/i3v/00217110/01525041.htm

Goran Jovanovic from the Oregon State University invented
a tiny reactor ("about the size of a credit card") that turns
vegetable oil into biodiesel.

http://www.forbes.com/work/feeds/ap/...ap2681244.html
http://www.mccookgazette.com/story/1152821.html

Regards,
Joachim

In article ,
zxcvbob wrote:

Can you then, instead of putting the biodiesel in a vehicle, simply
replace it back in the deep fryer, and cook with it?

I believe the flash point is way too low. I also dunno what the stuff
tastes like.

The flash point is somewhere between 210 and 570 degrees F (100-300
degrees C), depending on the organic source of the oil and the
purity of the refined fuel. I've heard that it tastes awful. But at
least it's non-toxic!

sd

Ian Stirling wrote:
Cooking in oil that has been used a long time is unhealthy, due to the
amount of free fatty acids that build up in the oil.

The process of making biodiesel removes these free fatty acids, and
converts them to a form that can be removed by washing the oil.
Washed biodiesel has no free methanol, near zero FFA, and no NaoH.

Can you then, instead of putting the biodiesel in a vehicle, simply
replace it back in the deep fryer, and cook with it?


I'd be most concerned with the methanol group coming off during
metabolism. It's a CH3-COO-R, right? It might cause some damage.

Biodiesel is also a great solvent. (I used some to remove marker
stains.) No telling what that great solvent will do to the cells
lining your mouth and esophagus...

Biodiesel also smells pretty funny - not at all like vegetable oil.
(At least, the stuff that I make...

Oh, and it's VERY flammable. Much, much, much more so than vegetable
oil.

On 23 May 2006 22:05:24 -0700, wrote:


Ian Stirling wrote:
Cooking in oil that has been used a long time is unhealthy, due to the
amount of free fatty acids that build up in the oil.

The process of making biodiesel removes these free fatty acids, and
converts them to a form that can be removed by washing the oil.
Washed biodiesel has no free methanol, near zero FFA, and no NaoH.

Can you then, instead of putting the biodiesel in a vehicle, simply
replace it back in the deep fryer, and cook with it?


I'd be most concerned with the methanol group coming off during
metabolism. It's a CH3-COO-R, right? It might cause some damage.

Biodiesel is also a great solvent. (I used some to remove marker
stains.) No telling what that great solvent will do to the cells
lining your mouth and esophagus...

Biodiesel also smells pretty funny - not at all like vegetable oil.
(At least, the stuff that I make...

Oh, and it's VERY flammable. Much, much, much more so than vegetable
oil.



of course its different. its the methyl ester of some single straight
chain alkane, rather than the glycerine ester of three straight chain
alkanes.

consider methyl decanoate versus tridecanoic glycerolate. (my
apologies to UIPAC).

considering taste? i'd go for the TDG as the tasty one...

zxcvbob wrote:
Ian Stirling wrote:
Cooking in oil that has been used a long time is unhealthy, due to the
amount of free fatty acids that build up in the oil.

The process of making biodiesel removes these free fatty acids, and
converts them to a form that can be removed by washing the oil.
Washed biodiesel has no free methanol, near zero FFA, and no NaoH.

Can you then, instead of putting the biodiesel in a vehicle, simply
replace it back in the deep fryer, and cook with it?


I believe the flash point is way too low. I also dunno what the stuff
tastes like.

Bob

Some time ago, during a backpacking trip, my dinner bowl became
contaminated by the nonvolatile residue left behind after some spilled
cooking fuel (white gas?) evaporated away. It tasted like soap, even
at very low concentration. I can't imagine how horrible food would
taste if it had been fryed in biodiesel.

Dave

In sci.chem beav wrote:
On 23 May 2006 22:05:24 -0700, wrote:


Ian Stirling wrote:
Cooking in oil that has been used a long time is unhealthy, due to the
amount of free fatty acids that build up in the oil.

The process of making biodiesel removes these free fatty acids, and
converts them to a form that can be removed by washing the oil.
Washed biodiesel has no free methanol, near zero FFA, and no NaoH.

Can you then, instead of putting the biodiesel in a vehicle, simply
replace it back in the deep fryer, and cook with it?
snip
Biodiesel also smells pretty funny - not at all like vegetable oil.
(At least, the stuff that I make...

Oh, and it's VERY flammable. Much, much, much more so than vegetable
oil.

of course its different. its the methyl ester of some single straight
chain alkane, rather than the glycerine ester of three straight chain
alkanes.

consider methyl decanoate versus tridecanoic glycerolate. (my
apologies to UIPAC).

considering taste? i'd go for the TDG as the tasty one...

Thanks all - somehow I'd become confused on the chemistry, and thought
that the methanol was merely a sort-of-catalyst, that ended up
contaminating the drained off glycerine, and was not present in the
product.

Though I note that ethanol can be used in place of it - with much
nastier process control and conditions though.
May be a bonus in some outlets if it is metabolised

Ian Stirling wrote:
In sci.chem beav wrote:
On 23 May 2006 22:05:24 -0700, wrote:

Ian Stirling wrote:
Cooking in oil that has been used a long time is unhealthy, due to the
amount of free fatty acids that build up in the oil.

The process of making biodiesel removes these free fatty acids, and
converts them to a form that can be removed by washing the oil.
Washed biodiesel has no free methanol, near zero FFA, and no NaoH.

Can you then, instead of putting the biodiesel in a vehicle, simply
replace it back in the deep fryer, and cook with it?
snip
Biodiesel also smells pretty funny - not at all like vegetable oil.
(At least, the stuff that I make...

Oh, and it's VERY flammable. Much, much, much more so than vegetable
oil.

of course its different. its the methyl ester of some single straight
chain alkane, rather than the glycerine ester of three straight chain
alkanes.

consider methyl decanoate versus tridecanoic glycerolate. (my
apologies to UIPAC).

considering taste? i'd go for the TDG as the tasty one...

Thanks all - somehow I'd become confused on the chemistry, and thought
that the methanol was merely a sort-of-catalyst, that ended up
contaminating the drained off glycerine, and was not present in the
product.

Though I note that ethanol can be used in place of it - with much
nastier process control and conditions though.
May be a bonus in some outlets if it is metabolised


Excess methanol ends up in the glycerin, along with traces of soap, and
the sodium ends up down there too but I don't know in what form (perhaps
as soap.) The process uses excess alcohol to encourage it to go to
completion. Large processors recover the waste methanol; it's easier to
distill out than is ethanol.

The chemicals in methyl ester biodiesel are considered safe by the FDA,
and I believe they have some use as food additives. Tests with rats
show that methyl biodiesel is nontoxic. That doesn't mean it's good for
cooking, but you are unlikely to poison yourself.

Bob