Abstract
Crambe seed had low bulk density (328 kg/m3) due to thick hulls (0.23 mm), which made up 21.2% of the seed weight. The mean seed diameter was 2.7 mm (SD±0.2 mm); the thousand-grain-weight was 6.2 g. Dehulling improves oil extraction efficiency and facilitates the marketing of high-protein meal (>40% protein). The effectiveness of roller milling/aspirating and the effectiveness of impact milling/aspirating on dehulling crambe seed were studied and compared by analyzing the meat and hull fractions for oil and protein contents and calculating material balances. Roller milling was more effective than impact milling. The optimal roller mill gap was 7/64 in. (0.28 cm), and the optimal impact mill speed was 2,400 rpm generating 44.7 m/s tangential speed. The optimal aspiration airflow was 1,970 ft3/min (55.7 m3/min). Roller milling/aspirating was projected to produce 46% protein meal at 12% moisture and 1% residual oil (typical of solvent extraction) or 42% protein meal at 12% moisture and 6% residual oil (typical of screw pressing most other oilseeds). Hand-dissected hulls contained 10.4% moisture, and 1.2% oil and 8.8% protein on a dry basis, whereas the meats contained 8.8% moisture, and 47.6% oil and 31.6% protein on a dry basis. Optimal roller milling/aspirating produced hulls with 8.1% oil and 11.4% protein and meats with 42.6% oil and 30.5% protein on a dry basis.
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Reuber, M.A., Johnson, L.A. & Watkins, L.R. Dehulling crambe seed for improved oil extraction and meal quality. J Amer Oil Chem Soc 78, 661–664 (2001). https://doi.org/10.1007/s11746-001-0323-y
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DOI: https://doi.org/10.1007/s11746-001-0323-y