Importance

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Abstract

The desolventizing of solvent-wet extraction residue which is obtained in the extraction of vegetable material such as soybean, rape, nut and other kernel or seed material etc. with organic solvents, such as hexane, benzine etc., is effected in a continuously operating multistage or multi-compartment system of specific construction by means of superheated steam or a fluid containing superheated steam. In this, at least 45%, but particularly 100%, of the superheated steam is introduced below the lowermost bottom plate, which serves exclusively to distribute the steam, and the steam is conducted in opposition to the solvent-wet material. The temperature of the escaping vapors is maintained at about 66.degree.-68.degree. C. (150.8.degree.-154.4.degree. F.). The apparatus is equipped with double bottoms (3) which are steam heated (6') and the bores of which are formed by a plurality of individual distance pieces or spacers (12) interconnecting the upper and lower plates of the bottoms. The lowermost bottom (4) as well as the steam inlet chamber (E) are also capable of being heated by steam.

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First Claim