Fractional deionization process

Details Fractional deionization process Fractional deionization process

2005-05-24

2005-05-24

Lawrence, Frank M. (Department: 1724)

Liquid purification or separation

Processes

Ion exchange or selective sorption

C210S748080, C204S519000, C204S524000

Reexamination Certificate

active

06896814

ABSTRACT:
A liquid treatment process is described for sequential removal of ionic species of progressively decreasing ionic strength without precipitation or “scaling.” An aspect of the invention includes dual electrodeionization operations. The first electrodeionization operation is performed at a voltage calculated to remove strongly ionized species such as calcium and magnesium from the feed water without scaling. The product of the first electrodeionization operation is then subjected to a second electrodeionization operation. The second electrodeionization operation is performed at a voltage greater than the first electrodeionization operation, and is designed to remove more weakly ionized species such as silica and carbon dioxide, preventing scaling. More than two successive electrodeionization operations may be performed if desired. Multiple electrodeionization operations may occur in a single electrodeionization stack or in multiple electrodeionization stacks.

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