FREMGANGSMAADE TIL FREMSTILLING AF TOERRE, FRITFLYDENDE PULVERE AF LET OXIDERBARE STOFFER

A process for pulverizing substances which are sensitive to oxidation, in particular oily substances, by dispersing oil-soluble substances, e.g. vitamins, carotinoids, pharmaceutically active compounds or aromas, in an aqueous solution of a film-forming colloid, which constitutes the continuous phase of the dispersion, with the addition of one or more substances from the group comprising the mono-, di- and polysaccharides, atomizing the dispersion, in a spray tower, in the presence of a spraying assistant and collecting the resulting particles in a fluidized bed, wherein, as the spraying auxiliary, a hydrophobic silica or a metal salt of a higher fatty acid is introduced above the fluidized bed and distributed uniformly in the spraying space, at a temperature at which the colloid of the atomized particles has not yet solidified, and the assistant-laden particles, colloid material of which essentially has not yet gelatinized, is collected in a fluidized bed, and dried therein in a conventional manner.