How to extract castor oil from castor seeds?

How to extract castor oil from castor seeds?

Castor seed is grown commercially on plantations but also harvested from wild plants.The seed must be hulled after harvesting.This can be done laboriously by hand or, more commonly,by machine.Small-scale hand-operated dehullers are available.But how to extract castor oil from castor seeds?The castor oil extraction plant is necessary.The complete set of castor oil production machine is castor oil extraction process mahcine,castor oil filtraction&purification process machine and castor oil refining process machine.

castor oil production process machinery

Castor oil production procerss machinery

Castor Oil Extraction Process:
Extraction of oil from castor seeds is done in a manner similar to that for most other oil seeds.The ripe seeds are allowed to dry, when they split open and discharge the seeds.

The seeds are dehulled after harvesting.  Dehulling can be done by hand (laborious) or, more commonly, by machine. Small-scale hand-operated dehullers are also available.The dehulled seeds are cleaned, crushed,flaked ,cooked and dried prior to oil extraction workshop. Cooking is done to coagulate protein (necessary to permit efficient extraction), and for efficient pressing.

The first stage of oil extraction is pre-pressing, normally using a high pressure continuous screw press – called the expeller. Extracted oil is filtered, and the material removed from the oil is fed back into the stream along with fresh material. Material finally discharged from the press, called castor cake, contains 8-10% oil. It is crushed into a coarse meal, and subjected to solvent extraction with heptane to extract further oil.

castor oil processing machine

Castor oil processing machine

Castor Oil Filtration & Purification Process:

Once the oil has been extracted from the seed, it is necessary to remove impurities present in the oil. The filtration systems are designed to remove particulates, water, dissolved gases, and acids. The equipment that is normally used for filtration is a filter press.

castor oil filtraction machine
Castor oil filtration machine

Castor Oil Refining Process:

The filtered oil (called the crude or unrefined oil) is sent to the oil refinery. The steps to refine the crude oil include:

Degumming process of crude castor oil:Done to remove the aqueous phase from the lipids, and to remove phospholipids from the oil.
Neutralization process of crude castor oil:The neutralization step is necessary to remove free fatty acids from the oil.
Bleaching process of crude castor oil:Bleaching results in the removal of coloring materials, phospholipids and oxidation products.
Deodorization process of crude castor oil:Deodorization results in the removal of odour from the oil.



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