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2025

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07

Desalination, separation and concentration of L-carnitine feed solution project: Electrodialysis solution

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The desalination, separation and concentration of the 50T/D L-carnitine feed solution project are extremely crucial links, directly related to the quality of the product and production efficiency. Electrodialysis technology, with its unique advantages, plays a significant role in this field.
Electrodialysis technology is based on the principles of electrochemistry and dialysis diffusion. It ingeniously utilizes the selective permeability of ion-exchange membranes and, driven by an external direct current electric field, achieves the directional migration of ions. In the 50T/D L-carnitine feed solution treatment scenario, the feed solution is introduced into an electrodialysis tank composed of alternating anion and cation exchange membranes and concentrated fresh water separators. When direct current is applied to the electrode plates at both ends, a direct current electric field is formed in the tank. Under the action of the electric field, the anions and cations (mainly inorganic salt ions) in the crude L-carnitine will selectively pass through the anion and cation exchange membranes respectively and migrate to the adjacent concentrated water partition chamber. Meanwhile, the L-carnitine molecules, unable to pass through the ion-exchange membranes, are retained in the dilute chamber, thus achieving desalination.

Compared with traditional desalination methods such as ion exchange resin column method and extraction method, electrodialysis has significant advantages in the desalination of L-carnitine feed solution. The traditional ion exchange resin column method generates a large amount of regeneration waste liquid during the production process, and the consumption of acid and alkali is high. The resin also needs to be replaced regularly, which is costly and causes serious pollution. The purification of L-carnitine by extraction takes a long time. If the composition of the crude product is complex, different extractants need to be frequently replaced. The treatment and disposal of organic solvents are also thorny problems. Electrodialysis technology does not introduce new impurities, can effectively enhance the purity of materials, reduce material loss, and has the advantages of low pollution, simple and stable process, and reliable operation.

In the separation stage, electrodialysis can precisely separate L-carnitine from inorganic salts, which is attributed to the selective permeability of ion-exchange membranes to different ions. By rationally regulating operating parameters such as electric field intensity, feed liquid flow rate and temperature, efficient separation can be achieved, ensuring the high purity of L-carnitine products.

In terms of concentration, electrodialysis also performs well. As the desalination process proceeds, the L-carnitine feed solution in the dilute chamber not only removes inorganic salt ions but also partially migrates with the ions, thereby achieving a certain degree of concentration. Moreover, this technology can concentrate concentrated water to a higher concentration, reducing the water volume for subsequent treatment and lowering energy consumption.

In practical project applications, a certain chemical plant successfully verified the excellent effect of electrodialysis in the desalination and purification process of crude L-carnitine during the innovation of the production process. The yield of L-carnitine was close to 100%, the processing capacity per unit area was considerable, the power consumption was relatively low, and all indicators were superior to traditional processes.

In conclusion, electrodialysis technology provides an efficient, environmentally friendly and economical solution for the desalination, separation and concentration of 50T/D L-carnitine feed solution, which has effectively promoted the sustainable development of the L-carnitine production industry and is worthy of further promotion and application in related fields.

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