PROCESS FOR THE PRODUCTION OF GRANULATES OF HYDRATED SODIUM PERBORATE

摘要

A process for the production of granulates of hydrated sodium perborate Sodium perborate hydrate granulates having an active oxygen content of from 14 to 18% by weight, in particular from 15 to 16% by weight, an abrasion index according to ISO test 5937 of not more than 10%, a speed of solution faster than 1.5 minutes, preferably faster than 1.0 minute (1 g/500 cm3 of water, 15.degree.C) and a bulk density above 0.6 to 1.2 kg/dm3 may be produced by compacting spray dried, substantially amorphous sodlum perborate hydrate having a bulk density below that of the granulate and a particle size such that 90% of the particles are smaller than 100 .mu.m and a weight loss in storage at 60.degree.C and 100 Pa for 30 minutes of from 0.2 to 2.0 of its weight is compacted between rollers at a contact pressure of from 5 x 103 to 2 x 104 N/cm, the scales are size reduced and the granulate is grain fractionated, optionally after the grains of the granulate has been rounded off by mechanical actlon. The advantage of the process lies in that it enables granulates having the above mentioned material data required by the market to be obtained easily and without undue subjection of the perborate to heat. 89 209 PV