The test method that you are using seems to me highly dubious, since there
are a number of pre-assumptions that has to be met.
For a further check I´d suggest this:
Take exactly 25 ml of biodiesel and dissolve it in exactly 225 ml of
methanol in a measuring glass. Now:
The biodiesel should be fully soluble in the methanol forming a clear bright
phase. If not, there is pollution in the biodiesel causing you trouble with
the water test. Each ml of undissolved material is corresponding to 4% by
volume. Are there any undissolved material at the bottom of the measuring
If there is, your reaction is not complete and this is causing you trouble
with the water test.
This method does not cover every aspect of quality, but it gives a hint
Good luck to you
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----- Original Message -----
From: "Jeffrey Tan" <[EMAIL PROTECTED]>
Sent: Thursday, August 11, 2005 2:19 PM
Subject: [Biofuel] Quality Test
> Hello all. Need some explanation and advise here on my experiments
> I have been using virgin cooking palm oil for the experiments. When
> following the steps for checking on quality, I put in 150ml of de ionised
> battery water and 150ml of the biodiesel obtained but the end result was
> clear yellowish liquid on top and white emulsion like on the bottom. I
> done 3 different batches with the same result. My further reading and
> is either the NaOH is too much/little or the methanol is too much/little.
> My next step will probably to increase the methanol from 200ml to 400ml
> batches are in 1 liter of new oil). Any comments or suggestions from the
> gurus out there?
> Can I continue with the bubble washing process with the above 3 test
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