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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In the atill its decomposition continues<br />
( the crude always being distilled alkaline )<br />
the ammonia gas passing out through the vacu-<br />
um pump. With alkaline distillation there is<br />
no accumixLation <strong>of</strong> nitrogen in the still foots<br />
when these are returned to the <strong>lye</strong>s, showing<br />
ultimate decomposition <strong>of</strong> all nitrogenous<br />
matter.<br />
Crude <strong>lye</strong> from cottonseed soap stock<br />
contains nitrogenous acid bodies that resist<br />
this decomposition thus necessitating waste<br />
<strong>of</strong> all still residues. The same applys to<br />
crudes obtained by the autoclave or twitohell<br />
process from cottonseed soap stock <strong>and</strong> black<br />
grease.<br />
Lyes stored free from caustic ferment,<br />
the nitrogenous matter decomposing, producing<br />
sulphides which give <strong>of</strong>f hydrogen sulphide on<br />
acidifying <strong>and</strong> some glycerol is converted to<br />
trime thylene glycol.<br />
Fermented <strong>lye</strong>s give considerable trouble<br />
irt the evaporator by foaming. The sulphides<br />
le
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