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Diagram of mercury cell electrolysis
http://en.wikipedia.org/wiki/Image:HgNaOHElectrolysis.png

 Castner-Kellner apparatusThere are three kinds of industrial methods for the extraction of chlorine by way of electrolysis.

 
  1. Mercury cell electrolysis (Castner-Keller process)

This was the first method to produce chlorine on an industrial scale.

  1. Diaphragm cell electrolysis
  2. Membrane cell electrolysis

Prior to the electrolytic methods, the Deacon process was used to extract chlorine through the direct oxidation of hydrogen chloride with oxygen or air.