The separation of oils and fats from oil bearing material is carried out by pressing & solvent extraction. pressing and solvent extractions are used for extracting oil from vegetable oil bearing material.
All extraction processes have the following common objectives:
To obtain the fat or oil uninjured and as free as possible from undesirable impurities
To obtain the fat or oil in as high a yield as is consistent with the economy of the process
To produce an oil cake or residue of the greatest possible value