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Life's Essential Elements: Chlorine & Iodine Chlorine and iodine, both halogens, have important uses in everyday life particularly in industries. Their uses are described on pages 6-8. Both these elements had been discovered around 200 years ago and have been used ever since however methods of obtaining these elements have changed throughout the years. Extracting Chlorine Several processes can be used to obtain chlorine the main one being electrolysis of sodium chloride solution known as brine, a method used by chlor-alkali industries. Electrolysis can be achieved using three types of electrolytic cells namely the diaphragm cell, mercury cell and membrane cell. `The main difference in these technologies lies in the manner by which the chlorine gas and the sodium hydroxide are prevented from mixing with each other.'^(1) [image002.jpg] [image004.jpg] [image006.jpg] In diaphragm cells brine flows through the separator (made of asbestos/polymer modified asbestos composite) to the cathode compartment. In...

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