Glycerol and spent lye clarification - Illinois Institute of Technology

(3) Zeisel and Fsmto's method is regarded as
the most accurate for scientific and general
purposes, but is too expensive for ordinary
factory working,
(4) The ace tin method failed to give con-
cordant results. If this method is still to
be employed, it is essential that the mean of
several estimations be taken,
Lewkowitsch (Chemical Technology of Fats
and Oils) considers that for ascertaining the
proportion of glycerol in its pure dilute
aqueous solution, oxidation methods are best,
and that either permanganate or dichromate
method gives good results in such cases. On
the other hand, there is no doubt that such
methods give high results with impure glycerol.
In such cases the acetin method is prefered.
Panto's method is said by Lewkowitsch not to
be good.
An attempt has been made to estimate the
glycerol content of a solution or mixture by
carbon-dioxide absorption. The method is
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