Use of a drying process for the removal of petroleum spirit from meal and extraction system for carrying out the process

摘要

A process known from drying techniques is used to remove petroleum spirit from the meal produced in the extraction of oil seeds and is adapted to the operation of an extraction system. In this process, heated beads are mixed in large quantities with the meal, which is moist with solvent, on its way from the extractor to the toaster, are separated again from the meal after delivering heat to it, are heated again and, in a continuous circulation, are again mixed with moist meal. The petroleum spirit is completely, or at any rate mostly, removed from the meal in this way by contact heat before it enters the toaster. It is possible in this way to dispense at least substantially with the steam treatment in the toaster which has hitherto been necessary to remove petroleum spirit. Wetting of the meal by condensed steam is avoided and, accordingly, the energy expended on the final drying is reduced.