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Production of halogens by electrolysis of alkali metal halides in a cell having catalytic electrodes bonded to the surface of a porous membrane/separator
Production of halogens by electrolysis of alkali metal halides in a cell having catalytic electrodes bonded to the surface of a porous membrane/separator
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机译:通过电解槽中的碱金属卤化物电解生产卤素,电解槽中的催化电极与多孔膜/隔板的表面相连
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摘要
A halogen, such as chlorine, is generated in an electrolysis cell in which at least one of the cell electrodes is bonded to the surface of a solid but porous membrane which separates the cell into anode and cathode chambers. A pressurized aqueous metal halide such as brine is electrolyzed at the anode to produce chlorine. Brine anolyte and sodium ions are hydraulically transported across the porous membrane to produce caustic (NaOH) at the cathode. By bonding at least one gas permeable, porous electrode to the hydraulically permeable membrane, the cell voltage for electrolysis of brine is considerably lower than that required for asbestos diaphragm cells, while achieving high cathodic current efficiencies by minimizing back migration of caustic to the anode.
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