5. Extraction of pantolactone from an aqueous solution in the production of vitamin B3 is carried out using a complex extractant in continuous extractors. Determine the distribution coefficient if the effective number of extraction stages in the apparatus is 3, the volume ratio of extractant/rafikate is 1/15, and the concentration of pantolactone in the raficate phase is: at the inlet - 197 kg/m3, at the outlet 15 kg/m3.

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