Recovery of carboxymesteine - electrodialysis technology

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Carboxymesteine, as an expectorant, is mainly used in the treatment of chronic bronchitis, bronchial asthma and other diseases caused by thick sputum, difficult expectoration. In the production process of carboxymethylsteine, wastewater is generated, and in order to treat this wastewater and recover carboxysteine in it, electrodialysis technology can be applied.

Electrodialysis technology is a kind of selective transmission of ion exchange membrane, under the action of external direct current electric field, the cation and cation ions are transferred selectively through the membrane, so as to alternately form a concentrated water chamber and a fresh water chamber, so as to achieve the purpose of desalination or concentration. Specifically, in the treatment of carboxymethylsteine production wastewater, the wastewater is first pumped into the salt chamber and an electrolyte is added to the salt chamber. In order to save energy consumption, an acid solution with the same anion or anion group as the salt to be removed from the wastewater can be added to the acid chamber as the initial solution, and a alkali solution or salt solution with the same cation or cationic group as the salt to be removed from the wastewater can be added to the alkali chamber as the initial solution. Then a direct current is applied between the positive and negative electrodes to desalinate the wastewater by electrodialysis. In this process, the acid chamber gets the acid solution, the alkali chamber gets the alkali solution, and the salt chamber gets the desalted carboxymethylsteine aqueous solution.

This method can not only effectively recover carboxymethyl steine in wastewater, eliminate organic pollution, at the same time, the converted acid and base can also be used back in the production process of carboxymethyl steine or other production processes, thereby saving costs and reducing the discharge of wastewater.

Note, however, that although electrodialysis may have potential applications in carboxymesteine recovery, the specific operating conditions and parameters may need to be optimized and adjusted based on the specific composition and concentration of the wastewater, as well as the desired recovery efficiency and purity. In addition, for any industrial scale wastewater treatment or recycling process, adequate research and testing needs to be carried out to ensure its economy and feasibility.

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