5718937 Process for the extraction of natural aromas from natural substances containing fat and oil

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 124 KB
• Volume: 6
• Category: Article
• ISSN: 0959-6526
• DOI: 10.1016/s0959-6526(98)90561-3

✦ Synopsis

An apparatus for roasting vegetable bulk material, in particular coffee beam is disclosed, in which essentially all of the cooling waste air of a cooler which cools the bulk material after the roasting operation is heated to roasting-gas temperature in a heat-exchanger stage and fed to the roaster. Essentially all of the roasting waste gases are heated, in a heating stage, to an extent which is necessary for increasing the temperature of the cooling gases to the roasting-gas temperature. Since the roaster operates with a higher roasting-gas throughput than hitherto,it is possible, with comparable roasting capacity, for the roasting-gas temperature to be reduced, this resulting in a more uniform roasting result. The apparatus has reduced harmful-substance emission along with increased thermal efficiency. Also disclosed is a method of roasting and cooling bulk material by utilizing the disclosed apparatus.