Organic solution desalting method integrating electrodialysis and reverse osmosis

Abstract

The invention relates to an organic solution desalting method integrating electrodialysis and reverse osmosis and belongs to the technical field of organic matter refinement. In the invention, by integrating electrodialysis and reverse osmosis, when an organic solution is desalted, the salt water which is originally discharged by an electrodialysis concentration chamber is subject to the reverse osmosis action to generate reverse osmosis water with low salt content, and the reverse osmosis water with low salt content is conveyed into the concentration chamber of the electrodialysis device again, thereby realizing the goal of cyclic utilization. Thus, the water consumption is reduced, and the concentration of the salt in the concentration chamber can be reduced after the reverse osmosis water with low salt content is introduced into the concentration chamber, thereby being favorable for transferring anions and cations in the desalting chamber into the concentration chamber to be removed and enhancing the desalting rate of the organic solution. Compared with the ion exchange method for desalting, the method of the invention saves a large amount of acids and alkalis and avoids the discharge of organic waste water with high salt content in the desalting process of the organic solution.

Description

technical field [0001] The invention relates to a method for desalting an organic matter solution integrated with electrodialysis and reverse osmosis, and belongs to the technical field of organic matter refining. Background technique [0002] When the ion exchange method is used to demineralize the organic solution, the ion exchange resin will be periodically saturated, and it is necessary to use acid and alkali to periodically regenerate the cation exchange resin and anion exchange resin respectively, which not only consumes a large amount of acid and alkali, but also discharges during the regeneration process. The wastewater contains both high-concentration inorganic salt and a large amount of organic matter, which belongs to high-salt organic wastewater, and subsequent wastewater treatment is difficult and expensive. [0003] When electrodialysis is used to desalt the organic solution, let the salt-containing organic solution flow through the electrodialysis desalinatio...

AI Technical Summary

Problems solved by technology

Desalting by electrodialysis can remove most of the salt in the organic solution, but this method also has the following defects: the brine in the concentration chamber needs to be continuously discharged, which makes this method consume more water than the ion exchange method; One-time desalination often cannot meet the requirements of organic matter refinement

Moreover, these two defects also restrict each other. Less discharge of salt water will inevitably lead to high salt content in the concentration chamber, which is quite unfavorable to the desalination of organic matter in the desalination chamber; to improve the desalination rate of organic matter in the desalination chamber, it is necessary to To speed up the discharge of brine in the concentrating chamber

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