ELECTRODIALYSIS WATER SPLITTING PROCESS

摘要

An electrodialysis water splitting processes incorporates a chromatographi c separation step using an amphoteric ion exchange resin to remove contaminati on salts from a salt solution feedstream and a base product solution. When the chromatographic column is subsequently eluted with water an effective separation of the components is achieved. The separated pure salt stream is forwarded to a n electrodialysis water splitter cell for conversion to acid and base. The bas e product solution (sodium hydroxide, potassium hydroxide) may be similarly purified b y passing through a second chromatographic column also containing an amphoteric resin to separate the base from the salt (recovered salt). The process is also applicable in a chlor-alkali process for acidifying the brine feed to the electrolysis cell and for producing high purity caustic from salt.