Dear Keith,
I used 1L of new rapseed oil and followed the
procedure.As soon as I added sodium methoxide to the
heated oil at 58C the glycerine separated immediately
and I started mixing it using a blender. I noticed
froth at the top.I mixed it for about half an hour.
The reaction seemed complete.
The froth was still there the next day.The test showed
it was very strong alkali layer.It could be a soap
layer?
I did the quality test on the liquid layer. It passed.
Then I repeated the same with a used vegetable oil.
The reaction seemed similar but there was a difference
in colour. The colour of the methyl ester was not
light yellow but brown; not different from the
original colour of the oil. Rapseed oil was light
yellow and the used oil was dark brown.
I did the quality test on the product of the used oil
by mixing 150ml water and 150 ml biodiesel and
standing the mixture. It did not separate into 2
layers clearly like the new rapseed oil biodiesel
did.It did separate into 2 layers but the top layer
was creamy with a froth on it. Does it mean the used
oil does not make a good biodiesel?
Fox
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