The Dow Chemical Company

Kari R Dawson-Ekeland

Richard T Stringfield

An improved method of decaffeinating and recovering such from caffeine containing materials without the use of organic solvents, except for regeneration of the resin, carbon or expensive extraction equipment, wherein the method comprises contacting an effective amount of an adsorbent resin with a liquid solution containing caffeine so as to adsorb caffeine from the liquid solution onto the adsorbent resin, where the adsorbent resin is made from a gel copolymer of a monovinyl aromatic monomer and a crosslinking monomer, where the gel copolymer has been post-crosslinked in the swollen state in the presence of a Friedel-Crafts catalyst and can be functionalized with hydrophilic groups if so desired.

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Midland, MI, United States of America

Kari R Dawson-Ekeland