Method for varying the capacity of an ion exchanger for a specific chemical element
AssigneeSiemens Aktiengesellschaft
InventorsWerner Schweighofer, Christian M. Z. Schwabedissen, Brigitte Siewert-Posielek, Karl Habeck, Klaus Seifert
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Abstract
A method for varying the capacity for a specific chemical element of an ion exchanger used for cleaning a liquid from a loop includes varying the chemical status of the element in the liquid to be cleaned immediately upstream of the ion exchanger by adding given substances. The given substances added are removed immediately downstream of the ion exchanger. The chemical element may be antimony, the loop may be the primary loop of a pressurized water reactor plant and the liquid may be primary coolant.
Claims15
A method for varying the capacity for antimony of an ion exchanger used for absorbing antimony from the primary coolant of the primary loop of a pressurized-water reactor plant, the ion exchanger having different capacities for different valences of antimony, which method comprises the steps of varying the valence of the antimony in the primary coolant from which it is to be absorbed immediately upstream of the ion exchanger positioned in the primary coolant loop by adding redox substances to the primary coolant for converting the antimony to a valence form for which the ion exchanger has a greater capacity than for the antimony in its original state, passing the coolant through the ion exchanger to remove the antimony, and then removing the remaining added redox substances from the primary coolant immediately downstream from the ion exchanger.
A method for varying the capacity of an ion exchanger used for absorbing a specific variety of valent chemical element from a liquid said specific chemical element existing in more than one chemical form, said ion exchanger having different capacities for different valences of said specific chemical element, which method comprises the steps of varying the chemical valence form of the chemical element in the liquid from which it is to be absorbed immediately upstream of said ion exchanger by adding redox substances to said liquid for converting said chemical element to a valence form for which the ion exchanger has a greater capacity than for this chemical element in its original state, then passing said liquid through said ion exchanger to remove said element, and then removing said adding redox substances from the liquid immediately downstream from the ion exchanger.
Dependencies are inferred from the claim text.