Electrodialysis Applications for Chemical-solution Desalination

Desalination of aqueous solutions of valuable chemical products is an effective technology for purification of products recovered from waste streams in the chemical industry. 

Of special note is the electrodialysis application for solution desalination in organic synthesis. For example, electrodialysis with ion-exchange membranes based on polystyrene and polyethylene for HCl removal from solution in chlor-hydrin synthesis is reported [2]. It is possible to get 1 N HCl from 1-3.5 g/1 so- 

Desalination of 70-75% diethyleneglycol solution by electrodialysis requires only 0.7-1.3 kWh/kg [2]. 

High water consumption by the chemical industry makes very important usage of electrodialysis for wastewater recovery [19]. For example, electrodialysis reversal demonstrated a stable performance and good fouling resistance in desalting wastewater from a paper mill [20]. The estimated cost of EDR treatment with 70% TDS removal and 85% recovery rate is 8.52/m.  

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