Oil Extraction Machine Common Methods
a) Water assisted. Here the finely ground oilseed is either boiled in water and the oil that floats to the surface is skimmed off or ground kernels are mixed with water and squeezed and mixed by hand to release the oil.
b) Manual pressing. Here oilseeds, usually pre-ground, are pressed in manual screw presses. A typical press is shown in diagram 1.
c) Expelling. An expeller consists of a motor driven screw turning in a perforated cage. The screw pushes the material against a small outlet, the "choke". Great pressure is exerted on the oilseed fed through the machine to extract the oil. Expelling is a continuous method unlike the previous two batch systems.
d) Ghanis. A ghani consists of a large pestle and mortar rotated either by animal power or by a motor. Seed is fed slowly into the mortar and the pressure exerted by the pestle breaks the cells and releases the oil. Ghani technology is mainly restricted to the Indian sub-continent.
e) Solvent extraction. Oils from seeds or the cake remaining from expelling is extracted with solvents and the oil is recovered after distilling off the solvent under vacuum.
Solvent extraction of soya bean flake
extractor → mixed oil → 1st and 2nd evaporation → stripping tower → crude oil
Wet meal → DTDC → cake
The whole equipment is composed of solvent extracting, wet meal roast & desolventing machine, long pipe evaporator, discal stripper, condenser and other equipment, and it’s matched with explosion proof motor, various kinds of connected pipes in plant, as well as the required accessories of instrument, apparatus, valve and so on
MAIN SYSTEMS IN A COMPLETE OIL PLANT:
A. Pretreatment/pressing section
B. Solvent extraction section
C. Oil refining section...