[Diy_efi] Re: biodiesel vs. rapeseed oil

Stephan Helbig sthl at gmx.de
Sun Dec 8 23:23:02 GMT 2002


Hi Patrick,

You are talking about biodiesel. Maybe there was a misunderstanding, but
Steve asked for real (viscose) cooking oil. How about this even less
energy consuming alternative? 
Biodiesl has two big disadvantages:
- it processes a lot of glycerine as a waste product and where does the
methanol come from?
- and it must be produced centralized i.e. also carried to and from a
factory though the distances are not that far as with petrodiesel.
Straight vegetable oil however can be produeced locally and does not
need to be distributed from and into factories. Here in Germany there
are a lot of farmers who grow rapeseed and press their own vegoil. You
can get your fuel from local farms all over Germany already (e.g. the
list at http://www.rerorust.de/poeltanke.htm).  Farmers again can run
their mashines on their own fuel then.
And as some critics mention over furtilization- the newest researches by
universities have shown that mixed fruit planting (rapeseed mixed with
other oil plants) increases the harvest to an equal level without
furtilizers. So I really hope for a change towards unchanged natural
fuel and slightly OEM-modified engines.

Stephan


> The amount of effort needed to produce a billion barrels of biodiesel would
> be a bit more efficient to a billion barrels of petro diesel. I say this
> using the batch/catalyst method of production for the biodiesel. As I think
> I metnioned in an earlier post, there are newer and much more efficient
> processes which are now coming out of the experimental phase.
> 
> As for hidden non-renewableness in either batch or flow type biodiesel,
> there are none.

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