Process for preparing granulates

US4946654A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

• Filing date: Jul 26, 1988
• Grant date: Aug 7, 1990
• Expiry date: Jul 26, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S118/05
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A new process for continuously preparing granules having narrow grain size distribution, comprising PA0 a. spraying the product to be granulated in liquid form into a fluidized bed, PA0 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, PA0 c. setting the fluidizing gas flow such that granules are formed which are of a predetermined size, and PA0 d. 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.