In archeological excavations 250 km south of Baghdad extraction pots (Figure 1.1 ) from about 3500 BC were found [1] , made from a hard, sandy material presumably air - dried brick earth. It is supposed that in the circular channel was the solid feed, which was extracted by a Soxhlet - like procedure with water or oil. The solvent vapors were condensed at the cap, possibly cooled by wet rags. The condensate then did the leaching and was fed back through holes in the channel to the bottom.
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