[EMAIL PROTECTED] wrote:
>Rapeseed oil is rich in these compounds more commonly known as vitamin
>E. Typical crude oil contains 600 pp. Demand for this vitamin is
>rising very rapidly, due to its proven anti-ageing effect on skin and
>vitality. It is also now being widely used as a natural antioxidant
>in foodstuffs, thus replacing some of the `suspect' synthetic
>antioxidants.
>
>The value of vitamin E is currently somewhere between £300-£700/kilo,
>depending on purity and parcel size. If we were to recover all the
>vitamin E per ton of crude rapeseed oil, this would equal 0.6 kg. If
>the value was taken as £200/kg. this means that we could recover £120,
>equivalent to 11p/litre of RME produced.
>
>As far as is known, none of the current producers of RME have
>considered this extremely valuable by-product. Extraction of the
>vitamin E from the RME is a relatively simple process involving
>distillation of the product, leaving the residue of tocopherols for
>further processing. Therefore, it would be important in the design of
>any production process to include this step. It might also dictate the
>method of esterification, as it is very important that the tocopherols
>are not chemically altered in any way.
Interesting. But are you sure it's still there in the oil?
David Reid wrote (22 Apr 2001, [biofuel] REFINING VEGETABLE OILS)
that the tocopherols are removed in the processing:
6)DEODORISING
Steam Distilation under pressure and exclusion of air
Removes:
Aromatic oils
Free Fatty Acids
Molecules imparting unpleasant odours and tastes
Temperature: = 240 to 270 degrees C ( 464 to 518 F ) for
30 to 60 minutes
Also removes:
Peroxides produced during refining and bleaching
Tocopherols ( vitamin E )
Terry says it's removed:
>Tocopherols (vitamin E) are usually taken out of the veggie oil before it
>reaches the market and turned into biodiesel (RME)
Is it also removed in food oil, Terry? That is, will it still be
there in used cooking oil, and if so, in what condition?
Best
Keith Addison
Journey to Forever
Handmade Projects
Tokyo
http://journeytoforever.org/
Biofuel at Journey to Forever:
http://journeytoforever.org/biofuel.html
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