| 摘要 |
PURPOSE:To prevent emulsification during extraction operation thus improving extraction velocity and extraction efficiency by performing the extraction in a first chamber partitioned by a solid membrane while feeding either one of an extraction feed or a back extraction solvent which are immiscible with each other to the first chamber using a liquid transfer means and another to the second chamber. CONSTITUTION:A first chamber serving as an extraction chamber 28 is formed between partition plates 14 and 20. a tubular solid membrane 30 is provided so as to communicate an extraction feed introducing chamber 18 with an extraction residual liquid discharging chamber 24 partitioned by the partition plates 12 and 20, and the inside of the partitioned section is used as a second chamber. A liquid transfer means 1 comprising a yarn-shaped supporting body is extended vertically from a back extraction agent introducing chamber 16 to a back extraction solvent discharging chamber 26. An extraction solvent is circulated through an introducing port 36, extraction solvent chamber 28, and a discharging port 38 of the extraction solvent. Extraction is performed by allowing the extraction feed introduced from a feed port 44 passing downwards through the second chamber to contact with the extracting solvent through the solid membrane 30. The back extraction solvent having larger specific gravity than the extraction solvent and being immiscible therewith is fed in the form of liquid drops to the extraction solvent chamber 28 along the liquid transfer means 1 from a liquid dropping tube 32 to contact directly with the extraction solvent, to perform thus the extraction.
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