Purification of hydrogen peroxide

Claim 1

IN A PROCESS FOR REMOVING ANION IMPURITIES FROM ACIDIC IMPURE HYDROGEN PEROXIDE OF ABOUT 10% TO ABOUT 0% HYDROGEN PEROXIDE CONCENTRATION ON A WEIGHT BASIS, AND CONTAINING LOWER ALIPHATIC CARBOXYLIC ACID AS AN IMPURITY, WHEREIN THE IMPURE HYDROGEN PEROXIDE IS INTIMATELY CONTACTED AT A TEMPERATURE NOT EXCEEDING 40*C. UNDER FLUID FLOW CONDITIONS WITH AN ANION-EXCHANGE RESIN IN BICARBONATE SALT FORM HAVING FUNCTIONAL QUARTERNARY AMMONIUM GROUPS ATTACHED TO A COPOLYMER OF STYRENE AND DIVINYL BENZENE, THE IMPROVEMENT COMPRISING DISPERSING SAID HYDROGEN PEROXIDE OVER A BED OF SAID RESIN IN PARTICULATE FORM WITH A GAS WHICH IS INERT UNDER THE EXISTING CONDITIONS ADMIXED WITH CARBON DIOXIDE SO THE HYDROGEN PEROXIDE SOLUTION PASSES IN THE FORM OF A FILM DOWNWARDLY THROUGH THE BED OF RESIN IN CONTACT WITH CARBON DIOXIDE CONTAINING GAS UNDER SUFFICIENT PRESSURE TO KEEP CARBON DIOXIDE DISSOLVED IN THE AQUEOUS HYDROGEN PEROXIDE, AND MAINTAIN THE PH IN THE RANGE OF ABOUT 3 TO ABOUT 8.