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In
chlor-alkali industries Chlorine (Cl2), Hydrogen
(H2) and Sodium Hydroxide ( caustic soda
- NaOH ) are manufactured by means of electrolysis process.
In chlor alkali industries three types of electrolytic
process are adopted for the production of above chemicals
:
: : Membrane
cell process (
louver anode, mesh anodes )
: : Diaphragem
cell process ( box anode, perforated anode )
: : Mercury
cell process ( mesh, strip anode, rod, weir anode
)
In each process salt ( brine ) solution is electrolyzed
by the action of direct electric current, which converts
the chloride ions to chlorine.
The reaction is :
2NaCl + 2H2O = Cl2 + H2
+ 2NaOH
In all the methods chlorine (Cl2) is produced
at the positive electrode ( anode ) and the hydrogen
(H2) and Sodium Hydroxide ( NaOH or caustic
soda ) are produced directly or indirectly at the negative
electrode ( cathode ).
Membrane or Diaphragm or Mercury is used to separate
the anode products from the cathode products according
the process adopted. |
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