Three-phase extraction of Chinese rapeseed using the Karr column
1995
Liu, J. | Shi, M. | Diosady, L.L. | Rubin, L.J.
The solvent-extraction method developed in our laboratory for canola has been optimized for the treatment of Chinese rapeseed on bench- and semi-pilot-plant scale. The seed was treated with a two-phase solvent system consisting of methanol containing 10% ammonia and 5% water (CH3OH/NH3/H2O) as the polar phase and hexane as the non-polar phase. A reciprocating liquid-liquid extraction column (Karr column) was used for the semi-pilot-plant scale oil extraction of ground seed suspended in CH3OH/NH3/H2O. The effect of interface level, total flow rate, agitation intensity, and the feed ratio of the two streams on extraction efficiency was investigated. Chinese rapeseed (120 micrometers/g of glucosinolate, 38.7% oil, 26.3% protein) was extracted under the most favourable conditions. On the bench and semi-pilot-plant scale, the extracted meal contained less than 30 micrometers/g of glucosinolates prior to washing, which meets the canola standards and is therefore suitable for animal feed. By washing the extracted meal twice with CH3OH/NH3/H2O and twice with methanol, the glucosinolate content was lowered to 3 micrometers/g, which is suitable for the production of protein isolates for human consumption.
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