Particular embodiments of and improvements in such drying processes using superheated steam as the hot gas steam and their application to useful materials and mixtures for wetting agents ,detergents and/or cleaning products are disclosed in a number of other earlier applications in Appalicants'name ,cf .in particular earlier german patent applications DE-P 42 04 035.3,DE-P 42 04 090.6, DE-P 42 04 050.8,DE-P 42 06 521.6,DE-P 42 06 495.3,DE-P 42 08 773.2 AND DE-P 42 09 432.1.

The technical teaching descirbed hereinafter relates to an improtant further development of this technology og producing dry pourable or free-flowing useful materials or mixture thereof for wetting agents ,detergents and/or cleaning products.The teching accroding to the invention is based in this regard on the disclosures and working principles of DE-A 40 30 688 and the earlier appilcation cited above .Accordingly,the disclosures of that document and the earlier applications cited above are hereby specifically included i nthe disclosure and working principles discussed hereinafter.