Methods for the electrolysis of aqueous solutions of alkali metal carbonates and bicarbonates for the production of alkali metal hydroxides at current efficiencies of >85 percent without the simultaneous co-production of halogen or acid can be performed at very low, commercially attractive cell voltages...http://www.google.com.au/patents/US5246551?utm_source=gb-gplus-sharePatent US5246551 - Electrochemical methods for production of alkali metal hydroxides without the co-production of chlorine
