To improve the operation of the columns of extraction by solvent and column made to implement it.

摘要

1. Process for the extraction of a solute from a divided solid or liquid product, by means of a solvent which is lighter than the product and having a boiling point less than that of the solute, on the interior of a column, pulsed or not pulsed, containing a pack of plates or the like, the upper part of which, at least, is heated so as to create a temperature gradient rising between its base and its top, the solvant charged with solute being then separated by distillation and recycled in the base of the column, characterized in that : - the heating is regulated at a value such that towards this top a partial vaporisation of the solvant appears, the vapours thus produced are collected and condensed ; - and in the base of the column the condensate thus obtained is recycled at the same time as the pure solvant separated from the solute by distillation on the exterior of the column in the conventional manner.