FIELD: continuous withdrawal of oil from solid agents such as oilbearing sands, plants or other solid matter by means of solvent. SUBSTANCE: due to pressure differential between outer inner spaces of oil extraction chamber, solid agents which practically contain no oil may be removed from extraction chamber through solid agent removal passage without removal of considerable volume of solvent. Pressure differential is at least 2 pound/inch (0.141 kg/sq.cm). EFFECT: enhanced efficiency. 50 cl, 5 dwg
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