Glycerol and spent lye clarification - Illinois Institute of Technology

In 1904 Garrlgue utilized the heat of the
glycerine vapor for superheating low pressure
steam injected into the still. ( For a com-
plete account of the distillation and refining
of crude glycerine the reader is refered to the
literature.
Spent soap lyes as produced by the modem
soap factory vary in quality depending upon
the practice of the soap maker. The refiner
would of course prefer to receive lyes free
from impurities and coloring matter, but the
object of passing water through the kettle
is to remove the dirt and coloring matter
from the soap as well as to obtain a good
yield of glycerol. It is advisable, however,
to avoid running nigre and rosin lye to the
glycerine plant, and this can only be done
when the glycerine has been properly removed
from the soap before the nigre and rosin are
added.
The yield of glycerine obtainable from
soap stock is entirely dependent on the amount
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