Method for drying and producing microporous particles and a drying device

US6438867B1 · 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: Aug 27, 2002
• Expiry date: Sep 11, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F26B7/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In a process for drying microporous, fluid-containing particles, the heat required for increasing the temperature is supplied by convection by reducing the interfacial tension of the fluid, preferably to 0 to 1/10, in particular to 0 to 1/20, of the interfacial tension of the fluid at room temperature, by appropriately increasing the temperature at from close to the critical pressure to supercritical pressure of the fluid. Furthermore, microporous, three-dimensionally networked particles are prepared by a process in which the drying process is used. In addition, an apparatus is used for carrying out the drying process, the apparatus comprising a pressure container having an inner container and pressure-withstanding outer container and suitable measuring and control apparatuses and pump apparatuses and heat exchangers, the inner container being provided for holding the particles to be dried and a gap being provided between the inner container and the outer container.