A - Human Necessities – 23 – F
Patent
A - Human Necessities
23
F
99/80, 99/82
A23F 5/20 (2006.01) A23F 3/00 (2006.01) A23F 3/38 (2006.01) A23F 5/16 (2006.01) A23F 5/22 (2006.01) C07D 473/12 (2006.01)
Patent
CA 1177313
SLURRY 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 water-immiscible fatty materials is impractical because the ratio of fatty material to aqueous caffeine solution will typically be about 20:1. Non-solvent systems employing solid adsorbents 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 slurry comprising a solid caffeine adsorbent and a water-immiscible, caffeine-specific solvent. The caffeine is selectively extracted from the aqueous solution, leaving the solubles necessary for a good tasting beverage, and then removed from solution by the solid adsorbent. Because the solvent is selective, the adsorbent does not have to be. And, because the adsorbent continuously maintains a low concentration of caffeine in the solvent, much lower solvent to aqueous solution ratios can be employed, preferably less than 5:1.
378270
General Foods Corporation
Mcfadden Fincham
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