How do you make decaf? How to remove caffeine from coffee? Starbucks decaf coffee

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Some people like to drink coffee and absorb the unique and multi-layered aroma of coffee while drinking, but they are allergic to caffeine and have no choice but to stay away; or some people's sleep quality is affected at night, or other health factors. Should not consume too much caffeine and so on.

But coffee is not just caffeine, it is rich in a variety of antioxidants and has a real impact on the prevention of some diseases.

Based on the above scruples and reasons

Decaffeinated coffee drinks are produced accordingly.

So how exactly do we remove caffeine from coffee?

Common method one

Supercritical fluid extraction was used. Raw beans are placed at high pressure, which dissolves caffeine through liquid carbon dioxide, but does not take away other substances in the coffee beans. In addition to carbon dioxide, dioxane (dichloromethane) and ethyl acetate (ethyl acetate) can also be used in this application.

So far, this method looks pretty good. Take nothing but caffeine.

Common method two

The water extraction method is used. When raw coffee beans are soaked in water, caffeine dissolves in water, but caffeine is not the only one that dissolves, and other compounds follow, so what should be done?

Thanks to technology, someone can extract the essence of a whole coffee bean, but it doesn't contain caffeine. We just need to add the coffee extract to hot water and soak the beans, because the caffeine in the water is zero, so the caffeine in the beans will dissolve in the water (this is the principle of chemical balance). But other compounds will remain in the bean body (because there is already a drop of "caffeine-free coffee extract"). After soaking for the first time, you can use activated carbon to remove only the caffeine from the aqueous solution, soak the beans in the original tank of water, and then remove the caffeine from the water. after repeating this step many times, there will be less caffeine in the beans each time. Almost remove caffeine from the beans, but retain most of the coffee flavor.

But this method is relatively laborious.