Preparation of sodium perborate
24 grams of borax and 5 grams of sodium hydroxide are dissolved in 150 ml of warm water. The solution is cooled to room temperature and add 283 ml of 3% hydrogen peroxide are added slowly. The solution is cooled additionally with stirring by immersing the beaker in ice water and dropping 20 grams of ice into the solution. After a few minutes, fine crystals of sodium perborate begin to separate. The solution is stirred frequently for the next 20 minutes, then the crystals are collected by filtration, washed with two successive portions of 25 ml each of ethyl alcohol and then two successive portions of 25 ml each of ethyl ether. Finally, sodium perborate is dried and preserved in a stoppered bottle. Sodium perborate obtained by described method contains four molecules of water (sodium perborate tetrahydrate), which at 70° C becomes hygroscopic sodium perborate monohydrate.
Synthetic inorganic chemistry, by A. A. Blanchard, 211, 1936
Sodium perborate monohydrate, Caswell No. 784A, UNII-Y9UKD0XE6F, Sodium borate, monohydrate, 10332-33-9, EPA Pesticide Chemical Code 011105, Perboric acid, sodium salt, monohydrate, Y9UKD0XE6F, Perboric acid (HBO(O2)), sodium salt, monohydrate, MolPort-035-395-072, sodium oxidooxy(oxo)borane hydrate, Sodium perborate monohydrate (USAN), sodium hydrate [(oxoboranyl)oxy]olate, AN-20392, LS-102364, D07066, sodium (oxoboranyl)dioxidanide hydrate (1:1:1), 3B4-4671
SODIUM PERBORATE, 11138-47-9 (Parent), CID197122