than 200 mol wt methyl hydroperoxide and the like each in amount of about 10 1000 ppm substantially complete removal of these impurities except formic acid acetic acid and methyl hydroperoxide from the hydrogen peroxide can be achieved through practice of the present invention the practice of the invention has important consequences in that during subsequent treatment procedures the formation of potentially hazardous mixtures of hydrogen peroxide and organic materials which might otherwise occur during hydrogen peroxide concentration can be substantially avoided an aqueous hydrogen peroxide stream containing 22 wt h 2 o 2 from the water and ethyl benzene extraction of methyl benzyl alcohol oxidate was treated in accordance with the invention the stream contained 100 200 ppm methyl benzyl alcohol 100 200 ppm acetophenone 40 80 ppm ethyl benzene 50 100 ppm methyl hydroperoxide 20 40 ppm ethyl benzene hydroperoxide 500 600 ppm benzoic acid 500 600 ppm formic acid 10 40 ppm acetic acid 100 200 ppm acids heavier than benzoic acid 50 70 ppm phenol 30 40 ppm benzaldehyde and 500 700 ppm heavy organics which have a molecular weight more than 200 such as methyl benzyl alcohol ethers the contaminated hydrogen peroxide solution was passed in the liquid phase at room temperature through a bed of amberlite u00ae xad 16 resin at the rate of 0 5 gpm ft 3 of resin and recovered solution was found to contain only 500 600 ppm of.