Affected Factors of Chlor-Alkali Membrane Use Efficiency and Solutions

Chlor-alkali membrane is made from perfluorosulfonic acid and perfluorocarboxylic acid ion exchange resin. It has excellent ion conductivity and good capacity of ion exchange.

There is picture of ion exchange membrane simple structure.
CAMS-01: A structure diagram of chlor-alkali membrane.

The anode side is sulfonate layer which is made from sulfonic acid resin that has good hydrophilicity. And it has higher moisture content than the carboxylate layer. The higher moisture content can increase the capacity of ion exchange that decide conductivity of membrane. So the sulfonate layer can be thick to ensure good conductivity and mechanical strength.

The cathode side is carboxylate layer that can well block the OH- from penetrating into the anode under the action of electric field. And it has high resistance which affects the efficiency of electric current, so this layer can be thin to reduce the membrane voltage.

The reinforcement can increase the strength of membrane and fix its geometric dimensions.

There are two affected factors on the use efficiency of chlor-alkali membrane:

  • Ion membrane pinhole: may be damaged because of improper operation or hard impurities in electrolysis system.
  • Deposition of impurities: some metal ions are converted to hydroxides on the way through the membrane, attaching to the membrane surface that make the voltage rise and reduce efficiency.

Some solutions:

  • In accordance with the rules strictly during moving and using it.
  • Control the concentration of light brine and impurities content in secondary brine.
  • Clean the pipes of electrolysis system carefully.

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