The extraction of potassium bicarbonate from the microporous polyamide-6 pellets feed using a semi- batch extractor has been investigated. The effects of solvent flow rate, solvent temperature, and feed mass on the extraction of solute have been analyzed. As solvent rate increased, the conductivity of miscella increased, and at highest solvent rate of 160 mL/min a maximum solute concentration of 1.9 wt. % KHCO3 was achieved. The maximal concentration of 2.3 wt. % KHCO3 was observed at a solvent temperature of 318 K at a batch processing time of 120 seconds. The conductivity of miscella also increased with increased feed masses. Further, the solute
concentration in the miscella increased with increased feed masses, and a maximum solute concentration of 2.1 wt. % was achieved at a feed mass of 0.13 kg during the initial stage of extraction. Use of the best operating conditions will optimize the extraction of potassium bicarbonate from polyamide-6 pellets feed on a large scale
Key words: Polymide-6: Potassium bicarbonate: Miscella: Oprtating conditions
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