Concentration of basic amino acids by electrodialysis

Eliseeva, T. V.; Krisilova, E. V.; Черников, М. А.

doi:10.1134/s0965544111080020

Cited by 8 publications

(5 citation statements)

References 19 publications

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“…The amino acid anions diffuse from the acid compartment into the base compartment or diffuse from the salt compartment into the catholyte compartment due to the concentration gradient. Furthermore, another reason for the decline in of the recovery rate is the electro‐osmosis of amino acids 44 . An amino acid is an amphoteric compound that will carry charge when the solution pH deviates from the isoelectric point.…”

Section: Resultsmentioning

confidence: 99%

Bipolar membrane electrodialysis for cleaner production of N‐methylated glycine derivative amino acids

Wang

Yan

et al. 2020

AIChE Journal

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In this study, cleaner production of N-methylglycine (NMG), N,N-dimethylglycine (DMG), and N,N,N-trimethylglycine (TMG) with similar structures but different methylate groups was performed using bipolar membrane electrodialysis (BMED). The effects of the feed mass concentration and current density on the separation performance were intensively analysed in terms of the molecular size, molecular structure, ion concentration, and interaction between amino acids and membranes. The results indicated that the optimal recovery performance was achieved at a current density of 200 A/m 2 and feed mass concentration of 6%. Under the optimal conditions, the energy consumption and current efficiencies were 2.3 kWh/kg and 78% for NMG, 2.49 kWh/kg and 69.5% for DMG, and 3.52 kWh/kg and 39.6% for TMG, respectively. It was speculated a competition for water splitting occurs between the bipolar membranes and anion exchange membranes when BMED is used for the separation and purification of large-sized bioproducts.

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Section: Resultsmentioning

confidence: 99%

Bipolar membrane electrodialysis for cleaner production of N‐methylated glycine derivative amino acids

Wang

Yan

et al. 2020

AIChE Journal

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“…In addition, the rate of Lys formation is further reduced with increase in process time in the EMR‐3 because appropriate Cl − is not available for substitution , . Thus, the transport of Cl − is decreased due to the barrier effect and increase in transport of free water across the membrane , . Moreover, the rate of Lys formation depends on applied current density during the conversion of 0.10 mol L −1 LysCl into Lys and the highest conversion of LysCl to Lys is achieved at 10 mA cm −2 .…”

Section: Resultsmentioning

confidence: 99%

Electro‐membrane reactor for the conversion of lysine monohydrochloride to lysine by in situ ion substitution and separation

Kumar

Khan

Othman

2012

J of Chemical Tech & Biotech

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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

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“…This phenomenon may be attributed partially to the osmotic and electroosmotic transport of water [24,25]. The water transport between adjacent compartments would lead to changes of the solution volume, thus resulting in the dilution or concentration of electrolytes.…”

Section: Amino Acid Concentrationmentioning

confidence: 99%