Pipes & worker at chlorine producing plant

Pipes & worker at chlorine producing plant

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Credit: JAMES HOLMES, HAYS CHEMICALS/SCIENCE PHOTO LIBRARY

Caption: MODEL REEASED. Pipes & worker at a plant producing chlorine by the electrolysis of brine (aqueous sodium chloride). The pipes are colour-coded for safety: yellow = chlorine, red = hydrogen, green = water. 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). The mercury is subsequently recovered & recycled. The plant shown is at Hays Chemicals in Cheshire, UK.

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Keywords: chemical industry, chlorine, industrial gases, pipework, plant, production of

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