Method for drying and producing microporous particles

US6516537B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Friedhelm Teich · Karlsruhe, DE
• Heiner Schelling · Ludwigshafen, DE
• Herbert Köster · Ludwigshafen, DE
• Horst Kratzer · Bischofswerda, DE
• Wolfgang Reichert · Bischofswerda, DE
• Martin Gall · Kalamazoo, US
• Bernd Ziegler · Ludwigshafen, DE

Key dates

• Filing date: Sep 11, 2000
• Grant date: Feb 11, 2003
• Expiry date: Sep 11, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/54
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In a process for drying microporous, fluid-containing particles, the fluid-containing particles to be dried are fed as a moving bed countercurrently to a drying fluid, the interfacial tension of the fluid being reduced in comparison with the interfacial tension of the fluid at room temperature, at near-critical to supercritical pressure of the fluid, preferably to a value in the range from 0 to {fraction (1/10)}, in particular from 0 to {fraction (1/20)}, of the interfacial tension at room temperature. Furthermore, microporous, three-dimensionally networked particles are prepared by a process comprising preparation of microporous particles containing pore liquid, exchange of the pore liquid in the particles for a fluid and drying of the fluid-containing particles, the exchange and drying being carried out in the moving bed by the countercurrent method.