Patent ID: 6296772
Filing Date: 2001-10-02
Classification: B01J,C13B,C13K

Abstract:
A method of purifying a liquid in an ion exchange system comprising:providing a first pair of ion exchange units with one unit containing cation resin and the other unit containing anion resin said units being connected in series to one another,providing a second pair of ion exchange units with one unit containing cation resin and the other unit containing anion resin said units being connected in series to one another and in parallel hydraulic communication with said first pair of ion exchange units,providing a third pair of ion exchange units with one unit containing cation resin and the other unit containing anion resin said third pair of units being connected in series to one another and in serial hydraulic communication with said first and second pair of ion exchange units,passing said liquid through said first and second pair of ion exchange units to remove impurities from said liquid,directing said liquid exiting said first and second pair of ion exchange units into said third pair of ion exchange units to remove additional impurities from said liquid to produce a desirable end product,removing said first pair of ion exchange units from service when said cation resin or said anion resin contained in said first pair of ion exchange units is exhausted,placing said second pair of ion exchange units and said third pair of ion exchange units in serial hydraulic communication,passing untreated liquid through said second pair of ion exchange units and said third pair of ion exchange units to remove impurities from said liquid,regenerating said first pair of ion exchange units, andreturning said regenerated first pair of ion exchange units to service before said second pair of ion exchange units or said third pair of ion exchange units is exhausted and placing said second pair of ion exchange units and said third pair of ion exchange units in parallel hydraulic communication and said regenerated first pair of ion exchange units in serial hydraulic communication with said second and third pairs of ion exchange units.