Glycerol and spent lye clarification - Illinois Institute of Technology
Glycerol and spent lye clarification - Illinois Institute of Technology
Glycerol and spent lye clarification - Illinois Institute of Technology
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aaed upon the oxidation reaction <strong>of</strong> glycerol<br />
by dichromate in sulphuric acid solution as<br />
represented by the following equation:-<br />
3 CgHgOg / 7 KgCrgO^ / 28 H^SO^ ->-<br />
7 HgSO^ / 7 CrgfSO^)^ / 9 00^ / 40 HgO.<br />
or<br />
2 C„H„0„ / 2 0„ —>- 6 C0„ / 8 H„0.<br />
3 8 3 2 2 2<br />
The carbon-dioxide is absorbed in potassium<br />
hydroxide (Geissler Bulb) <strong>and</strong> weighed; the<br />
carbon-dioxide is calculated to glycerol<br />
(or carbon-dioxide X .693 «>• glycerol) The<br />
results upon repetition agree well. The<br />
method is easy <strong>and</strong> rapid. With pure glycerol<br />
the oxidation is quantative. Crude glycerols<br />
must be treated to remove the impurities,<br />
Details:-<br />
About 6 grams <strong>of</strong> the sample is weighed<br />
(by difference) into a 250 c.c. volumetric<br />
flask, 50 c.c. <strong>of</strong> water added <strong>and</strong> the contents<br />
dissolved by shaking. A piece <strong>of</strong> blue<br />
litmus paper is dropped into the flask <strong>and</strong><br />
20
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