Reactive extraction of lactic acid using alamine

Kailas L. Wasewar, Albertus B.M. Heesink, Geert Versteeg, Vishwas G. Pangarkar

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    Abstract

    Lactic acid is an important commercial product and extracting it out of aqueous solution is a growing requirement in fermentation based industries and recovery from waste streams. The design of an amine extraction process requires (i) equilibrium and (ii) kinetic data for the acid–amine (solvent) system used. Equilibria for lactic acid extraction by alamine 336 in methyl-iso-butyl-ketone (MIBK) as a diluent have been determined. The extent to which the organic phase (amine +MIBK) may be loaded with lactic acid is expressed as a loading ratio, z=[HL]o/[B]i,o. Calculations based on the stoichiometry of the reactive extraction and the equilibria involved indicated that more lactic acid is transferred to the organic phase than would be expected from the (1:1) stoichiometry of the reaction. The extraction equilibrium was interpreted as a result of consecutive formation of two acid–amine species with stoichiometries of 1:1 and 2:1. Equilibrium complexation constant for (1:1) and (2:1) has been estimated. Kinetics of extraction of lactic acid by alamine 336 in MIBK has also been determined. In a first study of its kind, the theory of extraction accompanied by a chemical reaction has been used to obtain the kinetics of extraction of lactic acid by alamine 336 in MIBK. The reaction between lactic acid and alamine 336 in MIBK in a stirred cell falls in Regime 3, extraction accompanied by a fast chemical reaction occurring in the diffusion film. The reaction has been found to be zero order in alamine 336 and first order in lactic acid with a rate constant of 1.38 s−1. These data will be useful in the design of extraction processes.
    Original languageUndefined
    Pages (from-to)59-68
    Number of pages10
    JournalJournal of biotechnology
    Volume97
    Issue number1
    DOIs
    Publication statusPublished - 2002

    Keywords

    • Equilibria
    • Kinetics
    • Reactive extraction
    • MIBK
    • METIS-210784
    • Lactic acid
    • IR-74758
    • Alamine 336

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