I've been preparing my processing system, done a little in the way of
test batches, (1 litre), and lurking on this fine list, absorbing
information, and reading a lot on the biodiesel pages.
I guess I've got a decent grip on the process and the chemistry
involved, but I've had a question that I've not found the answer to yet.
If I'm using 20% by volume of methanol to make my methoxide then run
the transesterification, I understand that the methanol becomes part
of the molecule chain, with some attaching to the glycerides, and some
still floating free in the biodiesel which is washed out toward the
end of the process. So if I was to distill the glycerides and soap
rinse water, about what percentage of the methanol that I put in is
likely to still be recoverable with a distillery? Assume that the
recipe is the common NaOH/methanol, without the extra steps consisting
of the sulfuric or phosphoric acid treatments...
I'd like to know about how much of my waste material is going to be
recoverable, because as nature shows us, the concept of waste is
man-made. There is no waste in nature.
Thanks for your input, in advance.
doug swanson
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I have just fitted a condenser to my processor. I use the 2 stage
base/base process and add 20 litres of methanol to each 80 litre batch
of wvo. I add the byproduct removed after the first stage after the
second stage is finished and then boil off the methanol. I am recovering
about 6 litres of methanol out of each batch.
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