An Improved Extractor for Dual-Flow Extraction

Hideyuki Nishizawa, Yukako Watanabe, Sakiko Okimura, Yoshihiro Abe

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


An improved apparatus for dual-flow countercurrent extraction was constructed. Further, a simple method to evaluate the extractor was developed, by which the effective plate number could be calculated by a couple of measurements of fractional recoveries. To find the optimum operation condition, an apparatus with a shorter column (10 cm in length) was prepared, the efficiency of which was evaluated as being about one plate per cm of the column length by the method. It was also shown that the distribution constant of a compound could be calculated from the fractional recoveries measured by dual-flow countercurrent extraction. The distribution constants, thus obtained, agreed with values determined independently by liquid-liquid chromatography, which settled theoretical correlations between chromatography and extraction.

Original languageEnglish
Pages (from-to)339-343
Number of pages5
Journalanalytical sciences
Issue number3
Publication statusPublished - 1989
Externally publishedYes


  • Dual-flow countercurrent extraction
  • Extractor
  • Liquid particle chromatography
  • Liquid particle extraction

ASJC Scopus subject areas

  • Analytical Chemistry


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