Process for decaffeinating green coffee beans

Details Process for decaffeinating green coffee beans Process for decaffeinating green coffee beans

A - Human Necessities

23

F

99/80

A23F 5/16 (2006.01) A23F 5/02 (2006.01) A23F 5/20 (2006.01)

Patent

CA 1318812

ABSTRACT OF THE DISCLOSURE A simple, reliable process for decaffeinating green coffee beans to a high degree while avoiding denaturation of the green coffee beans includes wetting the green coffee beans to a high water content of 35 - 50%-wt.; compressing the beans in a pressure chamber for a period of a few minutes to several hours in an atmosphere comprised of a supercri- tical fluid which is a gas at STP, at a temperature ranging from 20 to 80°C under a critical pressure ranging from 75 to 300 bar; decompressing the wetted beans from critical pressure pc to a pressure p for which pc ? p ? 1 bar abruptly or in the space of a few minutes, while avoiding freezing the green coffee beans; washing with water or with the supercrit- ical fluid for selective extraction of the caffeine; repeat- ing the process one or more times; centrifuging; drying; and roasting the means. Further, caffeine is recovered in a known manner from the washing medium.

540125

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