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2025

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09

Electrodialysis: Practical Application of Glycine Separation from Salts

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Glycine, as an important chemical intermediate, is widely used in multiple industries such as medicine, pesticides, food, and feed. During the production process of glycine, wastewater or mixed solutions containing inorganic salts (such as ammonium chloride, sodium chloride, etc.) are often generated. The presence of these salts not only affects the purity of glycine but also increases the difficulty and cost of subsequent processing. Therefore, it is of great significance to develop an efficient and economical separation technology for glycine and its salts. Electrodialysis technology, as a membrane separation technique, has shown promising application prospects in the separation of glycine and salts in recent years.
I. Principles of Electrodialysis Technology
Electrodialysis technology takes advantage of the selective permeability of ion-exchange membranes. Under the action of an external direct current electric field, cations and anions in the solution are directed to migrate and selectively pass through the membrane. Inside the electrodialyzer, multiple sets of alternately arranged anion and cation exchange membranes separate the solution into concentrated water chambers and fresh water chambers. Cations pass through the cation membrane and move towards the negative electrode, while anions pass through the anion membrane and move towards the positive electrode. Thus, a high-concentration salt solution is formed in the concentrated water chamber, and a low-salinity glycine solution is obtained in the fresh water chamber.
Ii. Application Cases of Electrodialysis Technology in the Separation of Glycine and Salts
Obtain high-purity glycine products.


Iii. Advantages of Electrodialysis Technology in the Separation of Glycine and Salts
(1) Efficient separation
Electrodialysis technology can achieve efficient separation of glycine and its salts, enhance the purity of glycine, and reduce the difficulty and cost of subsequent treatment.
(2) Energy conservation and environmental protection
Compared with traditional methods such as evaporation concentration and crystallization, electrodialysis technology has lower energy consumption and does not generate a large amount of secondary pollutants, which meets the requirements of energy conservation and emission reduction.
(3) Easy to operate
The electrodialysis device has a relatively simple structure, is easy to operate, and is convenient to maintain and service. Meanwhile, this technology has relatively low requirements for the pretreatment of raw water and can adapt to the treatment of mixed solutions of glycine and salt with different concentrations and components.
(4) Resource recycling
Electrodialysis technology can further process the separated salt solution, recover the salt within it, and achieve the recycling of resources.
Iv. Conclusions and Prospects
Electrodialysis technology has significant application value in the separation of glycine and salts. By optimizing process parameters, improving equipment structure and other measures, the separation efficiency and economy of electrodialysis technology can be further enhanced. In the future, with the continuous optimization of membrane materials and the continuous development of electrodialysis technology, its application prospects in the separation of glycine and salts will be even broader. Meanwhile, electrodialysis technology can also be combined with other separation technologies to form a more efficient and economical wastewater treatment process for glycine production, providing strong support for the sustainable development of the glycine industry.

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