Industrial production of chlorine

Industrial production of chlorine

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Credit: JAMES HOLMES, HAYS CHEMICALS/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. Industrial production of chlorine by the electrolysis of brine, aqueous sodium chloride. A worker surveys the chlorine cooling & drying tower at the plant of Hays Chemicals, Cheshire, UK, in early evening. In the electrolytic process, chlorine gas is liberated at a graphite anode (positive electrode) & sodium at a mercury cathode (negative electrode). Sodium dissolves in mercury to form an amalgam, which is allowed to flow into a second cell to react with water to form hydrogen & sodium hydroxide (caustic soda) - secondary products that are widely used in the chemical industry.

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Keywords: chemical industry, chlorine, electrolysis, electrolytic, salt, sodium chloride, works

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