External regeneration system for mixed bed ion exchangers
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United States of America Patent
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Mar 23, 1993
Grant Date -
N/A
app pub date -
Aug 10, 1992
filing date -
Aug 10, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for regenerating exhausted anion and cation exchange resins for service in an associated mixed bed demineralizer. The method utilizes a portion of the exhausted anion and cation resins to form buffer zones which reduce cross-contamination between the anion and cation resins during regeneration. Alternatively, a relatively inert material having a specific density intermediate to that of the anion and cation resins can be used to form the buffer zones. The materials which form the buffer zones remain in the regeneration system and are not returned to the service vessels with the regenerated resin. The method includes an improved technique for terminating the transfer of cation resin from a separation vessel.
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