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Mechanical extraction is a conventional yet widely used crude oil extraction process followed for biological oil production. This method of extraction is suitable for industrial and large‐scale crude oil production. The treated seeds are permitted to flow into the mechanical extruder and allowed to crush the seeds through a twin screw extruder as seen in Figure 2.3a. In this process, the crude oil is collected at the bottom of the extruder whereas the by‐products are separated out.