Process and device for fluidized bed spray granulation

US5213820A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans Uhlemann · Solingen, DE
• Reinhard Boeck · Kaarst, DE
• Hans Daun · Leverkusen, DE
• Heiko Herold · Dormagen, DE

Key dates

• Filing date: Jun 12, 1991
• Grant date: May 25, 1993
• Expiry date: Jun 12, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B07B4/04
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Granule production is based on particle growth in a fluidized bed (4), in which the liquid starting product is sprayed into the fluidized bed and the finished granular particle is discharged from the fluidized bed (4) with classification. The classification is carried out with the aid of a classifying air flow which is divided into individual single flows (6) to each of which is assigned a zigzag classifier module (7, 17) and a spray nozzle (5) or a group of spray nozzles. The course of the classifying process is such that the granular particles which are too small and have not yet reached the desired diameter are thrown back into the fluidized bed (4) by a return shaft (9, 18) seated on each of the zigzag classifier modules (7, 17) in parallel or radial zones without cross-mixing, in which the relatively small particles impinge at a relatively large distance from the return shaft (9, 18) and the large particles, which have already grown close to the discharge size, impinge at a relatively small distance. The process is carried out with the aid of a fluidized bed granulator, to the inlet plate (2) of which is connected a zigzag classifier, subdivided in a modular manner, in which e…