Thanks to friend Aleks for digging this one up.
"Conversion of rapeseed oil into ethyl esters for use as Biodiesel fuel
involves transesterification of the oil triglycerides to mono-esters of the
component fatty acids. To accomplish this conversion, raw rapeseed oil is
treated at room temperature with ethyl alcohol in the presence of potassium
hydroxide as a catalyst. During the process, the glycerol which is produced
is insoluble in the ester product, and being heavier, settles out carrying
most of the dissolved KOH catalyst with it. "
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