THE PREPARATION" OF CORN OIL. 
13 
It is quite evident that the maximum bleach is obtained within 
the first hour of treatment. This is uniformly true at the three 
temperatures used in this experiment. At 150° C. the oil darkened 
during the first 15 minutes, increasing both in yellow and red, and 
then started to bleach, reaching its maximum in 45 minutes. At the 
higher temperatures the bleaching began at once and continued 
rapidly during the first 15 minutes, reaching its maximum in 60 
minutes in the sample maintained at 200° C. and in 45 minutes in 
that at 300° C. The data included in figure 5 show that the bleach- 
rtne 
f£TO °C. 
zoo°c 
300°C, 
1 — 7 ~~ >C. 
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120 " 
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37 .78 
28 .20 
30 .32. 
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4-.S AO 
36 .76 
sa /.zs 
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. 200° C 
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it 
CRUoe 
RFF/A/Ff 
- 30O°C. 
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ja 6.0 
36 40 
5 
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BLEACH, 
(W/TH Ft 
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Fig. 5. — The extent of the bleaching effected by the deodorizing treatment continued for various periods 
and at various temperatures. 
ing effect obtained at 200° C. was greatest, resulting in a very light 
oil. The foregoing experiments justify the conclusion that corn oil 
can be effectively deodorized and bleached by treatment with satu- 
rated steam at 200° C. under a vacuum of 25 inches for one hour. 
Since the bleaching obtained was so apparent, two samples of oil 
from the same source but not previously bleached with fuller's earth 
were deodorized at 200° C. for two and four hours, respectively. 
Table 7 shows the extent to which the oil was bleached and also a 
comparison of the results with those obtained from treating the oil 
with fuller's earth. 
67251°— Bull. 1010—22 3 
