Glycerol and spent lye clarification - Illinois Institute of Technology

glycerol and water are mieclble in all pro-
portions, the composition of the escaping
vapors cannot be calculated according to
Dalton's well known law, but lEust be derived
from actual observations. Gerlach determined,
with the aid of a vaporirceter, in which the
pressure of the vapor was measured by a column
of mercury, the vapor pressures as given in
the appendix.
Prom the table an approximate measure
can be derived aa to the losses that may be
inctirred on evaporating dilute solutions of
glycerol.
Experiments showed that up to a con-
centration of about 50 ^ no glycerol escapes
with the water vapors, even if the dilute
solutions be kept boiling for some little
time. At a concentration of about 70 ^
traces of glycerol escape from the boiling
solution. (Hehner.) The boiling point of
such a solution is 11S.6° C. (See table.)
Above this concentration notable amounts of
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