Decaf Coffee Methods
After the beans are moistened the solvent is circulated through the beans, evaporated and condensed to clean the solvent, and then circulated through the beans again. CO2 is the gas that makes sparkling mineral water and our favorite can of soda bubbly, and it is a highly selective solvent for caffeine, leaving behind the remainder of the bean that will ensure a great taste. The water method uses only water as the solvent to remove the caffeine, but depending on the process, the taste can vary from okay to great. The liquid they were in is the important part it is filtered through activated charcoal that has been pretreated with a carbohydrate and this charcoal is used to remove the caffeine, leaving behind the other coffee particles. The liquid is now the water that another batch of green beans is placed into, and because the water is already saturated with flavor elements, mostly the caffeine is removed and not the flavor.