JPS57200219A - Purification of saline water - Google Patents

Abstract

PURPOSE: To carry out the regeneration of a chelate resin for the purification of saline water, effectively, and to remove metal ions in high efficiency, by passing the regenerating liquid upward through the resin regeneration column in which the volume expansion of the resin takes place.

CONSTITUTION: The purification of saline water with a chelate resin is carried out by passing the saline water to the chelate resin layer converted to Na type. When the elution of the metal ions in the saline water through the chelate resin layer is detected, or preferably before the detection for the safety, the purification process is switched to the regeneration process. The regeneration process is composed of (1) elution with an acid, (2) extrusion with deionized water, (3) conversion of the resin with NaOH, and (4) extrusion and washing with deionized water. In the step 1, the chelate resin is converted from Ca type or Mg type to H type and volume contraction takes place, and in the step 3, the resin is converted from H type to Na type and the volume of the resin is increased. In the steps 2 and 3 wherein the volume expansion takes place, the liquid is passed upward through the resin and the regeneration is carried out while fluidizing the resin. The abrasion and deterioration of the resin caused by the volume expansion are prevented, and the resin is completely converted to the Na type by the process.

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