Process for producing calcium hypochlorite of high purity and available chlorine content

Claim 1

THE PROCESS OF PREPARING CALCIUM HYPROCHLORITE COMPOSITIONS BY INTRODUCING CHLORINE INTO A FIRST SLURRY OF LIME AND RECYCLE CALCIUM HYPOCHLORITE SUSPENDED IN A MIXTURE OF AQUEOUS CAUSTIC SODA AND RECYCLE LIQUOR TO FORM A CHLORINATED FIRST SLURRY, TRANSFERRING THE RESULTING CHLORINATED FIRST SLURRY IN SEQUENCE TO AN EVACUATED EVAPORATING ZONE AND THEN TO A CLASSIFYING ZONE, MAINTAINING CALCIUM HYPROCHLORITE CRYSTALS IN SUSPENSION IN THE LIQUOR PRESENT IN THE UPPER PORTION OF SAID CLASSIFYING ZONE, REMOVING FROM THE UPPER PORTION OF SAID CLASSIFYING ZONE A SECOND SLURRY IN WHICH THE SOLID PHASE IS PREDOMINANTLY CALCIUM HYPOCHLORITE, SEPARATING SAID SECOND SLURRY INTO CALCIUM HYPOCHLORITE AND A FIRST REMAINING LIQUOR AND RECYCLING SAID FIRST REMAINING LIQUOR TO SAID CLASSIFYING ZONE, MAINTAINING A BED OF SODIUM CHLORIDE CRYSTALS IN THE LOWER PORTION OF SAID CLASSIFYING ZONE, REMOVING FROM THE LOWER PORTION OF SAID CLASSIFYING ZONE A THIRD SLURRY IN WHICH THE SOLID PHASE PREDOMINANTLY SODIUM CHLORIDE, SEPARATING SAID THIRD SLURRY INTO SODIUM CHLORIDE AND A SECOND REMAINING LIQUOR AND RECYCLING SAID SECOND REMAINING LIQUOR TO SAID CLASSIFYING ZONE, REMOVING A FOURTH SLURRY FROM SAID CLASSIFYING ZONE AT A POINT BETWEEN SAID UPPER PORTION AND SAID LOWER PORTION OF SAID CLASSIFYING ZONE AND RECYCLING SAID FOURTH SLURRY TO SAID EVAPORATING ZONE.