In chlor-alkali industry some technologies such as mercury cell, diaphragm cell and membrane cell are used, their feed is chlorine sodium and some potassium chloride solution.
The diaphragm cell process (Griesheim cell, 1885s) and the mercury cell process (Castner-Kellner cell, 1892s) were both introduced in the late 1800s.
The membrane prevents the migration of chloride ions from the anode compartment to the cathode compartment; therefore, the caustic soda solution produced does not contain salt as in the diaphragm cell process.
In addition to the mercury cell circuit, PPG operates six diaphragm cell
circuits at Lake Charles, with a capacity of about 1.
The 10 to 12% sodium hydroxide product from a conventional percolating diaphragm cell is contaminated by similar concentrations of non-electrolyzed sodium chloride.
LaSueur's contributions are one example of Canadian contributions to chemical technology, and still form the basis of operation of all percolating diaphragm cells operated today.
The life span of a conventional diaphragm cell is about one year.
ChlorAlp installed the first of the new asbestos-free diaphragm cells in 1996.
This technology included membrane and diaphragm cell proprietary chloralkali plant technology, equipment and replacement parts.
ELTECH will also continue to market the diaphragm cells of both Hooker Chemical and Diamond Shamrock design, along with existing modifications, replacement parts, modified diaphragm materials under the SM-2(TM) and SM-3(TM) trademarks, and Polyramix(R) non-asbestos materials.
The company constructed a pesticide and organic chemical plant in 1956 that remained open until 1982; at which time, it switched from the mercury process to a diaphragm cell
process that is still in use.
There are mercury-based cells, membrane cells and diaphragm cells