Staedel [1] was the first to describe a method, later altered in various ways by others [2-6], according to which 30% H2O3 solution is distilled to remove most of the water, the residual H2O3 is crystallized by cooling, and the crystals are separated from the mother liquor. A 500-ml. distilling flask is provided with a standard male ground joint, onto which is placed a female glass cap, equipped with a distillation capillary. The side tube of the capillary is connected with ground joints to a spiral condenser, which empties into a receiver of about 200-ml. capacity. After the introduction of 180 ml. of Perhydrol (stored in bottles coated with paraffin wax), the flask is placed on a water bath (45 to 50°C) and the material is distilled over a period of about 3.5 hours at a pressure of 16 to 22 mm. Thus, about 150-160 ml. of water and some H3O2 are removed. The residue contains approximately 98% H203. The volume of water to be distilled may be marked off on the previously tared receiving flask. (If the temperature of the water bath rises above 52°C, the concentrated H3O3 turns yellow and should be discarded.) The concentrated product may be removed from the flask without any danger of decomposition. (If a female ground joint were to be used at the neck of the flask, the decomposition on the rough surface would be appreciable.)

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