Abstract

Experiments were carried out on the possibility of the formation and decomposition of methyl mercury (II) chloride (MMC) in each process in a mercury-type Cl 2-caustic electrolysis plant. The results obtained were as follows: (1) MMC was not formed through the reaction of aqueous inorganic mercurials with any material or compound such as carbon black, organic impurities in rock salt or organic coagulating agents. (2) 0·001 ppm of MMC was decomposed when either chlorine evolved at the anode or when 10–100 ppm of HClO was present in circulating brines. Therefore, it was concluded that there is little possibility of the formation of MMC in a mercury-type Cl 2-caustic electrolysis plant.

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