How is coffee decaffeinated?
The caffeine isn't the only thing lured from the beans during their decaffeinating bath. The coffee's flavor also seizes that moment to beat a hasty escape. So brewers need to coax the coffee's good taste back. We'll lay out the three primary methods of maintaining taste while separating a bean from its caffeine...
In one practice, the beans' post-soak water is mixed with a solvent that separates the caffeine from the liquid. Alternatively, the caffeinated water can be forced through activated charcoal or carbon filters, which also separates the caffeine from the solution. After either method, the coffee beans are re-submerged in the now-totally-caffeine-free watery extract where (hopefully) they reabsorb their flavor.
Another method that immerses the beans in one heck of a strong steam bath, and then dunks them in carbon dioxide. The CO2 scares the caffeine away, but keeps the beans' taste intact.
So, how successful are these processes? To be called "decaffeinated," caffeine levels must remain below 2.5 percent. And that dictate has the long arm of the law behind it. So bring on the big mug of soy-mocha-latte-ccino -- and make it a decaf.
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