There are three main decaffeination processes:
- Water Processing Method - A natural process, using water as a solvent to remove caffeine from the green coffee beans and are then rinsed and dried, and a vessel containing fresh green coffee is put on stream.
- Direct Solvent Method - This method usually uses methylene chloride, coffee oil or ethyl acetate to dissolve the caffeine and extract it from the coffee.
- Supercritical Carbon dioxide Method - employed to circulate the carbon dioxide through a bed of premoistened, green coffee beans. At such pressures, carbon dioxide takes on unique, 'supercritical' properties that enhance its usefulness as a solvent. Supercritical carbon dioxide has a density like that of a liquid, but its viscosity and diffusivity are similar to those of a gas.
Check out our decaf process in this article HERE