BACKGROUND: Commercially lysine (Lys) is produced as lysine monohydrochloride (LysCl). The presence of chloride ion (Cl−) in Lys makes it unfit for use in pharmaceutical and livestock feed industries. Various separation methods are required to achieve Lys from fermentation broths. This paper describes an electro-membrane reactor with three compartments (EMR-3) for the conversion of LysCl into Lys by in situ ion substitution and separation.
RESULTS: The conversion of LysCl into Lys in EMR-3 is achieved by in situ ion substitution and separation using organic-inorganic hybrid anion-exchange membrane (AEM). It is found that the rate of Lys formation is dependent on applied current densities and LysCl concentration. The 96.2% Lys is recovered and low energy (2.07 kWh kg−1) is consumed during the conversion of 0.10 mol L−1 LysCl in EMR-3 at 10 mA cm−2. Moreover, high current efficiency (93.02%) is achieved under the similar experimental conditions.
CONCLUSIONS: On the basis of process parameters (high Lys recovery and CE and low W), it is concluded that the developed electro-membrane reactor can be efficiently applied for the conversion of LysCl into Lys in an economically viable manner. © 2012 Society of Chemical Industry