How they decaf coffee?

Answer:
There are a few different ways of removing caffeine, but often a solvent will be used to extract caffeine from the coffee bean while leaving all the other chemicals in tact. This is then repeated several times to extract even more caffeine.
Other methods involve soaking of the beans to remove caffeine, and subsequently filtering the caffeine out of the water while keeping the beans and extracted coffee solids together.
First answer by RUClimate. Last edit by RUClimate. Contributor trust: 332 [recommend contributor recommended]. Question popularity: 1 [recommend question].