Useful material and mixtures thereof for use in wetting agents ,detergentes and/or cleaning products in the form of free-flowinggranules are generally obtained by drying intermediately obtained water-containing slurries of the materials in question.For dedades ,preparations such as thesehave been universally spray-dried on an industrial scale.Hot air or mixtures of air and hot combustion gases are used as th drying gas stream. The performance requirements which pourable and free-flowing powders granules or even more heavily compacted particulate materials such as these have to satisfy are extremely diverse and conflict with one another in many respects .For example ,the useful materials or mixtures thereof are now expected to be compacted to comparatively high apparent densities, but at the same time to dissolve quickly again in the washing or cleaning process .The use so-called fillers, which do not play a key role in the washing or cleaning process, but which can impart an increased apparent density and, to a certain extent,improved redis-solvability to the dry formulation, should be limied as far as possible ,better yet,dispensed with altogether.the content of surface-active components in the solid formulations should be increased as far as possible to satisfy the concepet of the optimized active-substance concentrate.however,it is known that these surfactants (both anionic and nonionic types)have s pronounced tendency to gel, particularly when dried from water-containing slurries ,so that even a fine-particle material is difficult to redissolve or may even be completely insoluble.Another important factor is the well-known temperature sentsitivity, the production of dry pourable or free-flowing useful materials and miatures thereof for the field of application in question,for example the industial production of laundry detergents ,has developed into a high-technology industry