Method for producing stable salts of dichloroisocyanuric acid

Claim 1

IN THE PROCESS OF PRODUCING A SALT OF DICHLOROISOCYANURIC ACID SELECTED FROM THE GROUP CONSISTING OF SODIUM DICHLORISOCYANURATE AND POTASSIUM DICHLOROISOCYANANURATE WHEREIN DICHLOROISOCYANURIC ACID AND AN ALKALI METAL HYDROXIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDD ARE REACTED TOGETHER AS A SLURRY IN AN AQUEOUS REACTION MEDIUM MAINTAINED AT A PH OF FROM ABOUT 6 TO ABOUT 7 AND AT A TEMPERATURE OF FROM ABOUT 5 TO ABOUT 65*C. TO PRODUCE A DICHLOROISOCYANURIC ACID SALT PRODUCT, SAID REACTION MIXTURE IS SEPARATED INTO A SUBSTANTIALLY SOLID PRODUCT STREAM AND A SUBSTANTIALLY EFFLUENT STREAM, SAID LIQUID EFFLUENT STREAM IS RECYCLED FOR USE AS AN AQUEOUS REACTION MEDIUM IN THE MAKE-UP OF ADDITIONAL SLURRIES OF SAID DICHLOROISOCYANURIC ACID AND AN ALKALI METAL HYDROXIDE, SAID SOLID PRODUCT STREAM IS DRIED TO OBTAIN SAID DICHLOROISOCYANURIC ACID SALT PRODUCT IN A SUBSTANTIALLY ANHYDROUS STATE, THE IMPROVEMENT WHICH COMPRISES FILTERING THE LIQUID EFFLUENT STREAM TO REMOVE SUSPENDED PARTICLES LARGER THAN 1K MICRONS BEFORE SAID STREAM IS UTILIZED AS AN AQUEOUS REACTION MEDIUM IN THE MAKE-UP OF ADDITIONAL SLURRIES OF DICHLOROISOCYANURIC ACID AND AN ALKALI METAL HYDROXIDE, WHEREBY SAID AQUEOUS REACTION MEDIUM IS FREE OF IMPURITIES WHICH AFFECT THE THERMAL STABILITY OF THE DICHLOROISOCYANURIC ACID SALT CRYSTALS PRODUCED THEREIN, AND RECOVERING FROM SAID MIXTURE A DICHLOROISOCYANURIC ACID SALT PRODUCT HAVING A HIGH THERMAL STABILITY.