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

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 o...

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Bibliographic Details
Published in:AIChE journal 2020-11, Vol.66 (11), p.n/a
Main Authors: Wang, Yaoming, Wang, Xiaoli, Yan, Haiyang, Jiang, Chenxiao, Ge, Liang, Xu, Tongwen
Format: Article
Language:English
Subjects:
Amino acids
Anion exchange
Anion exchanging
bipolar membrane electrodialysis
cleaner production
Current density
Dimethylglycine
Electrodialysis
Energy consumption
Glycine
Ion concentration
Membranes
Molecular structure
Separation
Water splitting
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Summary: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/m2 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.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.17023