| 摘要 |
PROBLEM TO BE SOLVED: To provide an extraction method capable of improving time efficiency of extraction processing.SOLUTION: An extraction method includes: an extraction step of extracting a specific component to an extractant from raw material fluid while circulating the raw material fluid and the extractant in each flow channel 28 of first to ninth extraction apparatuses 11-19; a derivation step of deriving a fluid mixture of the raw material fluid and the extractant from each flow channel 28 before the extraction of the specific component from the raw material fluid reaches the extraction balance in each flow channel 28 of the first to ninth extraction apparatuses 11-19; a separation step of separating each fluid mixture derived in the derivation step into the raw material fluid and the extractant; a raw material fluid supply step of supplying each raw material fluid derived from each flow channel 28 of the first to eighth extraction apparatuses 11-18 and separated in the separation step to the flow channel 28 of the next stage extraction apparatus; and a pH adjustment step of adjusting the pH of the raw material fluid so as to return the change in the pH generated in the extraction step before supplying the raw material fluid derived from each flow channel 28 of the first to fifth extraction apparatuses 11-15 and separated in the separation step to the flow channel 28 of the next stage extraction apparatus.SELECTED DRAWING: Figure 1 |
