S. Kocakusak et al., PRODUCTION OF SODIUM PERBORATE MONOHYDRATE BY FLUIDIZED-BED DEHYDRATION, Industrial & engineering chemistry research, 36(7), 1997, pp. 2862-2865
Sodium perborate monohydrate is used in the formulations of concentrat
ed detergents and some medical, disinfectant, and cleaning preparation
s. Sodium perborate monohydrate (NaBO3 . H2O or NdBO2 . H2O2) contains
16% active oxygen. It does not have a specific melting point. When he
ated, it decomposes by releasing oxygen and water. Sodium perborate mo
nohydrate is preferred to tetrahydrate due to its higher oxygen conten
t and faster dissolution rate. In addition, in storage, monohydrate is
more stable than tetrahydrate. Sodium perborate monohydrate is produc
ed commercially either by dehydration of tetrahydrate or by crystalliz
ation of monohydrate. In this work sodium perborate tetrahydrate is de
hydrated in a fluidized-bed dehydrator at 100-180 degrees C with about
0.5 h retention time. The product obtained was pure and had the desir
ed bulk density and active oxygen content. Its dissolution rate was hi
gh, and it had good properties of storage and resistance to dusting. D
uring dehydration when dry air was used, dehydration temperatures of 1
45-150 degrees C and a retention time of 0.5 h were found to be suitab
le for the production of monohydrate with an active oxygen content of
15.6% and bulk density of 0.5-0.6 g/cm(3).