Chlor-alkali diaphragm electrolysis process and relevant cell

Details Chlor-alkali diaphragm electrolysis process and relevant cell Chlor-alkali diaphragm electrolysis process and relevant cell

C - Chemistry, Metallurgy

25

B

C25B 1/46 (2006.01) C25B 9/08 (2006.01) C25B 15/08 (2006.01)

Patent

CA 2114758

IMPROVED CHLOR-ALKALI DIAPHRAGM ELECTROLYSIS PROCESS AND RELEVANT CELL ABSTRACT OF THE DISCLOSURE In a process of chlor-alkali electrolysis carried out in a diaphragm cells comprising pairs of interleaved anodes (B) and cathodes, said cathodes being provided with openings and coated with a porous diaphragm resistant to corrosion, at least part of said anodes (B) being provided with hydrodynamic means (D) to produce circulation of the anodic brine, said cell having inlets (M) for feeding the fresh brine, and outlets for the removal of produced chlorine (H), hydrogen and caustic, the improvement comprising controlling the oxygen content in the chlorine and the chlorate concentration in the caustic independently from the said fresh brine introduced and from the concentration of the said brine by adding an aqueous solution of hydrochloric acid to the brine in the anodic compartment of the cell through a distributor (C) positioned over the hydrodynamic means (D).

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