Regenerant reuse

Details Regenerant reuse Regenerant reuse

2007-01-02

2007-01-02

Barry, Chester T (Department: 1724)

Liquid purification or separation

Processes

Ion exchange or selective sorption

C210S687000

Reexamination Certificate

active

10841936

ABSTRACT:
The invention provides a method for recycling the waste regenerant from softeners. The method includes passing a high concentration of monovalent ionic halide salt through a resin bed. The high monovalent cation concentration causes the divalent cations on the resin to be exchanged with the monovalent cations by osmotic forces. The regenerant is then treated to precipitate the divalent cations and replace them with monovalent cations.

REFERENCES:
patent: 4207397 (1980-06-01), Davis et al.
patent: 6776913 (2004-08-01), Jangbarwala
patent: 2005/0238733 (2005-10-01), Henry

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