초록 ▼

An electrodeionization polarity reversal apparatus is employed for the removal of dissolved salts from liquids. The preferred embodiment comprises the use of a fluid permeable filler of an equinormal mixture of anion and cation exchange material in both the ion-depleting and ion-concentration chambe

An electrodeionization polarity reversal apparatus is employed for the removal of dissolved salts from liquids. The preferred embodiment comprises the use of a fluid permeable filler of an equinormal mixture of anion and cation exchange material in both the ion-depleting and ion-concentration chambers while employing periodic symmetrical polarity reversal.

대표청구항 ▼

In the method of substantially preventing fouling of ion-exchange membranes and ion-exchange filler, and preventing scale formation in the chambers of an electrodeionization apparatus during the electrical transfer of ions from one electrolyte solution to another, comprising the steps of passing a f

In the method of substantially preventing fouling of ion-exchange membranes and ion-exchange filler, and preventing scale formation in the chambers of an electrodeionization apparatus during the electrical transfer of ions from one electrolyte solution to another, comprising the steps of passing a first electrolyte solution through the ion-depleting chambers of said apparatus having a plurality of alternating ion-depleting and ion-concentrating chambers, said chambers being defined between alternating anion and cation perm-selective membranes, the said ion-depleting and ion-concentrating chambers containing a fluid-permeable filler of ion-exchange material, passing a second solution through the ion-concentrating chambers of said apparatus, passing a third and fourth solutions through the electrode chambers, passing a direct current transversely across the chambers, periodically reversing the polarity of the said direct current and simultaneously therewith interchanging the first and second solutions between their respective chambers.