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 



com oil. 





Items. 



Neutral- 

 izing. 



Bleach- 

 ing. 



Deodor- 

 izing. 



Total. 





a $14. 71 



6 118.68 



.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 













"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 . 



eCost 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 piovides 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 



