Abstract
Abstract Due to the zwitterionic character, we may extract amino acids with ion-exchange carriers by controlling the pH of aqueous amino acid solutions. A modified Lewis-type cell experiment was conducted to study the extraction kinetics of glutamic acid by naphthenic acid, a cation-exchange carrier. The effects of agitation, interfacial area, carrier concentration, pH, and initial concentration of amino acid on the extraction rate were discussed. By comparison of the experimental results with the proposed interfacial extraction mechanism, it was found that the extraction equilibrium constant, K cx, is 1.62 × 10−2, the apparent forward extraction rate constant, k 1, is 0.63 cm4/mol·s, and the reverse rate constant, k −1, is 38.9 cm4/mol·s. The intrinsic chemical reaction is controlled by the formation of an amino acid/carrier complex at the interface. The extraction mechanism proposed was successfully correlated with the experimental results.
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