Reduction of Environmental Burdens Chlorine Engineers Corp., ltd.

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About Brine Electrolysis

Brine electrolysis is a technology to produce caustic soda and chlorine from salt that is one of the most common minerals on the earth.

It is widely recognized that caustic soda is used as a material for aluminum and glass, and chlorine to disinfect water. Caustic soda and chlorine are basic and important chemical used in a wide range of industries such as production of plastic, textile, pulp, aluminum, steel, and petroleum refinement so that Brine electrolysis is the basic industry for all technical fields.

  • Chemical textile
  • Pesticide
  • Synthetic rubber
  • Photo developer and fixative
  • Seasoning
  • Tannage
  • Paper/Pulp
  • Airplane/automobile interior materia
  • Paint
  • Dye
  • Baking soda
  • Sewage treatment
  • Adhesive
  • Synthesis skin
  • Rocket fuel
  • Margarine
  • Construction material
  • Urethane
  • Water pipe-layer
  • Plastic sheet
  • Food wrapping
  • Solvent
  • Antifreeze
  • Medicine
  • Dry cleaning
  • Deodorant/fly dope
  • Metal washing
  • Water purification/sterilization
  • Bleacher
  • PC/TV
  • Copy/Fax
  • CD, DVD
fig: Caustic Soda Production Process

Caustic Soda Production Process

Caustic soda and chlorine are produced by supplying treatment Brine solution to the electrolyzer and applying direct electric current. This method is called salt electrolysis. Currently, there are three methods of salt electrolysis: mercury, diaphragm and ion exchange membrane (IEM).

All mercury plants were replaced with IEM in the middle of 1986 in Japan. Diaphragm plants were also sequentially replaced with IEM because there is an advantage of power consumption. Therefore, only IEM plants are currently operating. In the field of mercury processing, Mitsui & Co., Ltd. and Mitsui Engineering & Shipbuilding Co., Ltd. that are our parent companies jointly delivered electrolysis facilities to 38 plants, and its share reached 2/3 of the entire market.

The first mercury method transformation started in 1974 when IEM was not developed, and diaphragm method facilities were delivered to 17 plants. At that time our share in this field exceeded 50%.

Our abundant experience and know-how is applied for current IEM technology and our share of IEM electrolyzer exceeds 40% (production amount base).

Overseas Activities

We started marketing abroad in the beginning of 1975. We can provide any type of service such as selecting plant site, calculate economy, basic/detail design, device procurement, construction, sending supervisor, or promoting turn key type project using local construction companies. We delivered our electrolyzer to more than 100 plants in more than 10 countries. The IEM method electrolysis plant (U.S. Texas) manufactures 1,900 tons per day (caustic soda) which is the largest scale of IEM in the world.

In this respect, our technology and service performance are also highly evaluated overseas.

Ion Exchange Membrane (IEM) Method Process

IEM method is highly advanced and an outstanding technology in all aspects compared to the mercury transformation method or diaphragm method in terms of running cost, product quality, operation/maintenance, and environment protection. We started developing IEM method immediately after the company was formed. The initial investment, running cost, maintenance cost, easy operability/maintenance, safety and life cycle of hardware are usually subject for technological evaluation and our electrolyzer is superior than other competitive products.

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