Adsorption decaffeination

Details Adsorption decaffeination Adsorption decaffeination

A - Human Necessities

23

F

99/80

A23F 3/38 (2006.01) A23F 5/22 (2006.01)

Patent

CA 1171727

ADSORPTION DECAFFEINATION ABSTRACT The object of the invention is to provide an improved method for removing caffeine from aqueous solutions such as coffee and tea extracts. Decaffeination with non-solvent systems employing solid absorbents have not been commercially practical because they are either too non-selective or too expensive. The process disclosed herein decaffeinates an aqueous caffeine solution by contacting it with a a solid caffeine adsorbent which is made more selective to caffeine by a thin layer of a water-immiscible, caffeine-specific solvent. The caffeine is selectively extracted from the aqueous solution, leaving the solubles necessary for a good tasting beverage, by the solid adsorbent. Because the solvent is selective, the coated adsorbent likewise shows selectivity.

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