THE PREPARATION OF CORN OIL. 
21 
Table 12 shows the distribution of costs for the several processes 
involved. 
Table 12. 
-—Distribution of costs 
of refining 
25,000 pounds of 
corn oil. 
Items. 
Neutral- 
izing. 
Bleach- 
ing. 
Deodor- 
izing. 
Total. 
a $14. 71 
b 118. 68 
.50 
13.80 
$26. 59 
24.82 
.75 
13.80 
$41. 30 
143. 50 
Fuel . . . 
$12. 42 
13.80 
13.67 
41.40 
161. 19 
Total 
c 401. 06 
t 
o Caustic treatment according to method 2. 
b This figure is obtained by subtracting the value of the soapstock from the value of the oil lost. 
cCost per pound, 1.6 cents. 
DESCRIPTION OF THE EQUIPMENT AND THE METHOD OF HANDLING 
CORN OIL IN THE REFINERY. 
The refinery illustrated in figure 7 is designed for installation in a 
corn-oil expelling plant. Since such a plant is generally provided 
with storage facilities for crude oil, the refining equipment as here 
designed pi ovides for only one tank, A, for this purpose. When this 
tank is about full (the product of half a week's run) the oil is 
pumped into the refining tank B. It will be observed that the de- 
livery pipe is tapped into the tank near the bottom. This arrange- 
ment is for the purpose of avoiding the churning and excessive foam- 
ing contingent upon introducing the oil over the top of the tank, as 
is usually done. The oil is here refined, as previously described, 
and then allowed to stand, usually overnight, to allow the soapstock 
to settle out. The supernatant clear oil is then drawn off by means of 
a swivel arm and pumped to tank C, while the soapstock in the cone- 
shaped bottom is softened by steam coils and allowed to flow into 
the soapstock tank d, for subsequent filling into barrels. In a large 
refinery this is not the cheapest disposition, but in a small one it is 
probably the most practicable. 
The small tank a, provided with barrel rests, receives the caustic 
soda for refining. The lye is transported by the monte-jus a' (closed 
tank provided with air pressure) to the weak-lye tank b, where the 
volume (or weight, if the tank is on scales) is adjusted for the given 
batch of oil. Tank c is for miscellaneous chemicals used from time 
to time for special treatment of the oil, such as salt and soda ash. 
If the oil is to be washed, it is heated to approximately 165° F. 
and washed by spraying with about 5 per cent of hot water, or, better, 
with a 10 per cent brine solution, after which the water is allowed to 
settle out. The coils not only bring the oil up to the required tem- 
perature but assist in the separation of the moisture suspended in 
the oil. The water is drawn off from the bottom of the tank and 
