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Abstract

In industrial processing, grains of rapeseed are dehulled. Cold-pressed rapeseed core oil is pressed from a low-hull grain fraction having at most 4 weight percent of hulls. In a press cake being generated, the cake temperature is limited to 70° C., and a first residual oil content is reduced to 8 to 28 weight percent of the dry matter. Pressurized steam is supplied, and the press cake is subsequently expanded to form collets. The steam is metered such that the press cake is temporarily heated to above 100° C. and the collets have a temperature of 80° C. to 95° C. after the expansion. The collets are extracted with an organic solvent, a second residual oil content being reduced to 2 weight percent or less of the dry matter. After the expansion, some of the collets are returned and mixed with the low-hull grain fraction in order to increase the friction when being pressed.

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First Claim