C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/156, 204/57.
C25B 1/46 (2006.01) C01D 3/14 (2006.01) C01D 3/16 (2006.01) C25B 9/00 (2006.01) C25B 15/08 (2006.01)
Patent
CA 1167407
ABSTRACT OF THE INVENTION An improved integrated and cyclic process and apparatus are disclosed wherein portions of various process and waste fluids are recycled to control impurities in the influents to membrane chlor-alkali cells and simultaneously to minimize liquid pollutants from the process. Part of the liquid effluent from the cathode compartments is used to control the pH of the brine feed during precipitation of non-monovalent cations as insoluble salts; to absorb chlorine recovered from recycled liquid effluent from the anode compartments and optionally to regenerate anion exchangers used to demineralize water influent to the cathode compartments, the spent regenerant being recycled to conserve alkali and monovalent cations. In a process of electrolyzing alkali metal chloride solutions wherein anode and cathode compartments are separated by fluid impermeable, cation permselective perfluorocarbon membranes, a saturated chloride solution is mixed with a compound from the group of phosphoric acid, alkali metal carbonates, bicarbonates, phosphates and acid phosphates, and the pH is adjusted to 10 with alkal1 metal hydroxide effluents. The pretreated solution is then contacted with a chelating cation exchanger in the monovalent cation form. The effluent from the anode compartments is maintained in the range 2 - 4. Hydrogen from the cathode compartments is combined with chlorine from the anode compartments, and the chelating cation exchanger is regenerated with a portion of the hydrochloric acid solution thus produced.
356022
Ionics Incorporated
Macrae & Co.
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