When procuring a biodiesel plant, the feedstock flexibility is the most critical factor; ensure the system can process multiple oil sources such as UCO (Used Cooking Oil), acid oils, and vegetable oils. Look for continuous flow transesterification technology rather than batch processing for higher efficiency. Key benchmarks include a conversion rate of ≥98%, a methanol recovery rate of >95%, and the integration of PLC automated control systems (like Siemens or ABB) to ensure precise temperature and pressure management.