Regeneration of mixed single bed deionization

Claim 1

THE METHOD OF REGENERATING THE ANION AND CATION EXCHANGE RESINS IN MIXED SINGLE BED DEIONIZATION APPARATUS WHEREIN SAID EXCHANGE RESINS UNDERGO A SATURATION AND REGENERATION CYCLE CONSISTING IN, FORMING SAID MIXED BED FOR NORMAL OPERATION DURING THE SATURATION CYCLE OF ANION EXCHANGE RESINS, CATION EXCHANGE RESINS HAVING A SPECIFIC DENSITY GREATER THAN THE ANION EXCHANGE RESINS AND A THIRD SUBSTANCE HAVING A SPECIFIC DENSITY INTERMEDIATE THAT OF SAID ANION AND CATION EXCHANGE RESIN, PRIOR TO REGENERATION BACKWASHING AND HYDRAULICALLY GRADING SAID MIXED BED TO FORM A LAYER OF ANION EXCHANGE RESINS IN THE UPPER PORTION OF SAID BED, A LAYER OF CATION EXCHANGE RESINS IN THE LOWER PORTION OF SAID BED AND A LAYER OF THE THIRD SUBSTANCE INTERMEDIATE THESE ANION AND CATION LAYERS, REGENERATING SAID ANION LAYER BY PASSING ANION REGENERANT SOLUTION DOWNWARDLY THROUGH SAID ANION LAYER AND DRAWING OFF SAID SOLUTION THROUGH THE INTERMEDIATE LAYER, REGENERATING SAID CATION LAYER BY PASSING CATION REGENERANT SOLUTION INTO SAID INTERMEDIATE LAYER TO ALLOW IT TO DISPLACE DOWNWARDLY BY GRAVITY FLOW THROUGH SAID CATION LAYER, RINSING SAID ENTIRE BED TO REMOVE EXCESS REGENERANT SOLUTION REMAINING THEREIN, AND AIR BUMPING THE BED TO MIX SAID LAYERS TO RETURN THE BED TO CONDITION FOR THE NORMAL OPERATION OF SAID DEIONIZATION APPARATUS AND THE SATURATION PORTION OF THE EXCHANGE RESIN CYCLE.

Claim 2

THE METHOD OF REGENERATING THE ANION AND CATION EXCHANGE RESINS IN MIXED SINGLE BED DEIONIZATION APPARATUS WHEREIN SAID EXCHANGE RESINS UNDERGO A SATURATION AND REGENERATION CYCLE CONSISTING IN, FORMING SAID MIXED BED FOR NORMAL OPERATION DURING THE SATURATION CYCLE OF ANION EXCHANGE RESINS, CATION EXCHANGE RESINS HAVING A SPECIFIC DENSITY GREATER THAN THE ANION EXCHANGE RESINS AND A THIRD SUBSTANCE HAVING A SPECIFIC DENSITY INTERMEDIATE THAT OF SAID ANION AND CATION EXCHANGE RESIN, PRIOR TO REGENERATION BACKWASHING AND HYDRAULICALLY GRADING SAID MIXED BED TO FORM A LAYER OF ANION EXCHANGE RESINS IN THE UPPER PORTION OF SAID BED, A LAYER OF CATION EXCHANGE RESINS IN THE LOWER PORTION OF SAID BED AND A LAYER OF THE THIRD SUBSTANCE INTERMEDIATE THESE ANION AND CATION LAYERS, REGENERATING SAID ANION LAYER BY PASSING ANION REGENERANT SOLUTION DOWNWARDLY THROUGH SAID ANION LAYER AND DRAWING OFF SAID SOLUTION THROUGH THE INTERMEDIATE LAYER, REGENERATING SAID CATION LAYER BY PASSING CATION REGENERANT SOLUTION INTO SAID INTERMEDIATE LAYER TO ALLOW IT TO DISPLACE DOWNWARDLY BY GRAVITY FLOW THROUGH SAID CATION LAYER, RINSING SAID ENTIRE BED TO REMOVE EXCESS REGENERANT SOLUTION REMAINING THEREIN, AND AIR BUMPING THE BED TO MIX SAID LAYERS TO RETURN THE BED TO CONDITION FOR THE NORMAL OPERATION OF SAID DEIONIZATION APPARATUS AND THE SATURATION PORTION OF THE EXCHANGE RESIN CYCLE.