A - Human Necessities – 23 – F
Patent
A - Human Necessities
23
F
99/80
A23F 5/20 (2006.01)
Patent
CA 1201918
- 10 - A process for decaffeinating green coffee. A B S T R A C T. Green coffee is decaffeinated in at least three extraction sections in continuous or semi-continuous countercurrency to an extraction liquid containing water and methyl ethyl ketone or methyl acetate, at a temperature approximately equal to the boiling temperature of the solvent. The coffee is supplied to the first extraction section with approximately its natural water content, and the organic solvent is supplied to the last extraction section with a water content of 5 - 10 % by volume. Water is added to the first extraction section in at most such a quantity that no segregation occurs, and the solvent enriched with caffeine, withdrawn from the first section, contains 5 - 10 % by volume of water. The residence times of the coffee and the extraction liquid in the extraction apparatus, the phase ration between the extracted coffee and the extraction liquid and the number of extraction sections are attuned to each other in such a manner that the caffeine content of the extracted coffee is less than a pre-determined percentage, preferably less than 0.1 %, calculated on its dry content.
434080
Douwe Egberts Koninklijke Tabaksfabriek-Koffiebranderijen-Theeha
Goudreau Gage Dubuc
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