Greg H. asks:

>In making Biodiesel, if someone uses methanol, it does not have to be
>water free, but if you use ethanol, it has to be water free correct?

To be totally exact, neither of them has to be water-free. It's just that
methanol, being a much stronger acid than ethanol, is less sensitive to
water. (ie, it makes methoxide much more readily than ethanol makes
ethoxide). Methanol can have a few percent of water and still work,
whereas ethanol should have no more than a few tenths of a percent.

By using a combination of ethanol and methanol, you can achieve a
level of water-sensitivity somewhere between the two.

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