Purification of hydrogen peroxide

Claim 1

A CONTINUOUS PROCESS FOR THE PURIFICATION OF HYDROGEN PEROXIDE WHICH COMPRISES: ADDING TO AN ABOUT 0.5% TO 25% BY WEIGHT IMPURE AQUEOUS SOLUTION OF HYDROGEN PEROXIDE FROM ABOUT 0.05% TO ABOUT 10% BY WEIGH OF THE HYDROGEN PEROXIDE OF A PHOSPHATE ION PROGENITOR; INTRODUCING THE AQUEOUS SOLUTION OF HYDROGEN PEROXIDE CONTAINING THE PHOSPHATE ION PROGENITOR AND AN AQUEOUS SUSPENSION OF HYDRATED LIME INTO A FIRST REACTION ZONE WHEREIN THE HYDROGEN PEROXIDE AND THE HYDRATED LIME COMBINE IN THE PRESENCE OF THE ADDED PHOSPHATE ION PROGENITOR TO FORM SOLID CALCIUM PEROXIDE OCTAHYDRATE; SEPARATING THE SOLID CALCIUM PEROXIDE OCTAHYRATE FROM THE MOTHER LIQUOR, SLURRYING THE SEPARATED CALCIUM PEROXIDE OCTAHYDRATE IN WATER; PASSING A CONTINUOUS STREAM OF SLURRY OF CALCIUM PEROXIDE OCTAHYDRATE INTO A SECOND REACTION ZONE WHEREIN THERE IS MAINTAINED A SUBSTANTIALLY CONSTANT TEMPERATURE BETWEEN ABOUT 30* C. AND ABOUT 80* C. AND A SUBSTANTIALLY CONSTANT CARBON DIOXIDE PRESSURE OF AT LEAST 100 POUNDS PER SQUARE INCH FOR A PREDETERMINED TIME OF RESIDENCE WITHIN SAID ZONE GREATER THAN THAT CERTAIN RESIDENCE TIME AT WHICH THE NUMERICAL VALUE OF THE DIFFERENTIAL DC/DT, C BEING THE PERCENTAGE DECOMPOSITION TO NON-PEROXYGEN PRODUCTS OF THE ACTIVE OXYGEN CONTAINED IN THE FEED TO SAID SECOND REACTION ZONE AS THE RESIDENCE TIME, T, OF THE SLURRY IN SAID SECOND REACTION ZONE IS VARIED, PASSES THROUGH ZERO FROM POSITIVE TO NEGATIVE VALUES, BUT NOT GREATER THAN ABOUT 6 TIMES THE LENGTH OF SAID CERTAIN RESIDENCE TIME; AND WITHDRAWING FROM SAID SECOND REACTION ZONE AN AQUEOUS SLURRY COMPRISING SOLID CALCIUM CARBONATE SUSPENDED IN AN AQUEOUS SOLUTION OF HYDROGEN PEROXIDE.