Fats and oils are extracted from the natural sources by the following processes:
1. Rendering. The animal tissues containing the fat are heated dry or with water until the fat melts and can be removed.
2. Pressing. Oils are obtained from seeds by crushing between steel rollers and then pressing in a hydraulic press.
3. Solvent Extraction. It is often applied to the residue after pressing or rendering for complete removal of oil or fat. The solvents used include petroleum ether and benzene.