Process and apparatus for preparing granulates

US6680032B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans Uhlemann · Solingen, DE
• Burkhard Braun · Odenthal, DE
• Heinz Hausmann · Leichlingen, DE
• Gerhard Stopp · Leverkusen, DE
• Horts Karkossa · Leichlingen, DE

Key dates

• Filing date: Jan 11, 1993
• Grant date: Jan 20, 2004
• Expiry date: Jan 11, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2208/00761
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A new process for continuously preparing granules having narrow grain size distribution, comprisinga) spraying the product to be granulated in liquid form into a fluidized bed,b) separating the proportions of fine material escaping from the fluidized bed from the off-gas and returning said fine material to the fluidized bed as nuclei for granule formation,c) setting the fluidizing gas flow such that granules are formed which are of a predetermined size, andd) removing the completed granules solely by way of at least one countercurrent gravity classifier inserted into the outflow bottom of the fluidized-bed vessel.A new apparatus for carrying out the process according to the invention and new granules.