The seeds are carefully separated from any capsule debris and are subsequently decorticated. Traditionally, castor oil is extracted by boiling the crushed seeds in water and skimming off the floating oil. Industrial shelling is done between rollers adjusted to the seed size to ensure that only the outer shell is broken. Oil is extracted from the decorticated seeds either by screw press, solvent extraction, pre-press-solvent extraction or extrusion followed by solvent extraction.
During the process of cator oil processing, these seeds must be crushed and pressed with hydraulic or continuous castor oil press at high or low temperature. High temperature hydraulic pressing yields 80 percent of available oil. Further castor oil processing can release much of the remaining oil.
The seed must be hulled after harvesting. Castor oil processing can be done manually by hand or more commonly by castor oil press. Maybe small-scale hand-operated dehullers are your choice. Modification of the oil is achieved by a variety of chemical processes including oxidation, hydrogenation, and thermal treatments to produce products for specific applications. Extracted oil is filtered and the material removed from the oil is fed back into the stream along with fresh material. Materials are finally discharged from the castor oil press, called cake, contains 8 to 10 percent oil. It is crushed into a coarse meal, and subjected to solvent extraction with hexane. In the entire process of castor oil processing, castor oil press can also be used for peanuts, beans, sesame, soybean, cotton seed, flax, sunflower seed, coconut, cacao, jatropha seed, tea seed, prickly ash seed, chilli seed, corn germ, and other many kinds of oilseeds plants.
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