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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dilute sulphuric acid added until the litmus<br />
shows a faint pink. A 10 ^S solution <strong>of</strong> silver<br />
nitrate until all chlorine <strong>and</strong> aldehydic com-<br />
pounds are precipitated, Basic lead acetate<br />
is then added in slight excess to remove<br />
alhumen <strong>and</strong> nitrogenous matter. Excess lead<br />
is removed by precipitating with sulphuric<br />
acid. The solution is made up to 250 c.c.<br />
<strong>and</strong> a portion filtered through a dry paper,<br />
Twenty five c.c, <strong>of</strong> the filtrate is placed in<br />
the evolution flask <strong>and</strong> 4 grams <strong>of</strong> dichromate<br />
are added. The mixture is boiled gently for<br />
one hour. The carbon-dioxide is weighed <strong>and</strong><br />
calculated to glycerol. Carbon-dioxide times<br />
,693 gives the glycerol content. (<strong>Glycerol</strong><br />
content) divided by (Weight <strong>of</strong> sample divided<br />
by 10) gives Percent <strong>Glycerol</strong>,<br />
Any bubbles or froth that may be present<br />
while making up to the 250 c.c, mark may be<br />
dispelled by the addition <strong>of</strong> 2 or 3 drops <strong>of</strong><br />
concentrated sulphuric acid.<br />
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