1. Decaffeination
By: Myron Sailors

2. What is this “Decaffeination”
of which you speak?
of which you speak?
Decaffeination is the removal
of caffeine from a substance.
It is usually associated with
coffee beans and tea leaves

3. Well, how is this “process” done?
Well there are many different
ways
French water process
Chemical extraction method
Supercritical fluid method
Swiss water method

4. Could you explain the French Water Process?
This process uses equilibrium the most of all the processes.
The beans are soaked in water for over 24 hours. The water acts as a
solvent and the caffeine shifts from the bean to the water to achieve
equilibrium.
The beans are dried whilst the water is run through a charcoal filter.
The caffeine has a greater attraction to the charcoal than the water and
coffee solids in the water.
The beans are then returned to the 99.9% caffeine-free water
(Stardivant)

5. Interesting, what about the Chemical Extraction
Method?
In the chemical extraction process, the beans are first soaked in water
to soften the beans.
The beans themselves are then soaked in one of two organic solvents.
The beans can be soaked in dichloromethane (CH Cl ) or ethyl acetate₂ ₂
(CH CO C H ).₃ ₂ ₂ ₅
The solvent removes the caffeine. Once it does so, the beans are treated
with steam. The solvent and the caffeine evaporate out of the beans.
(Barstow 1)

6. That’s nice, tell me more about this “Supercritical
fluid” method.
This process is probably the most interesting.
CO is heated and pressurized. The CO₂ ₂
reaches its supercritical state.
The supercritical CO is passed through the₂
coffee. When it passes through the coffee it
dissolves the caffeine.
The CO is passed through a pressure₂
reduction valve and the caffeine precipitates
and the CO is collected to be used again.₂
(Barstow 2)

7. Yo Myron, don’t forget about the Swiss Water
Process.
Ok, if you insist.
This is probably the easiest to find information about.
The beans start off soaking in water when a solvent is added to the water.
The beans are then removed from the water and the water is then passed
through a carbon filter.
The water is the added to the beans. This process is repeated until the beans
are 99.9% caffeine free. The total time is 8-10 hours.
http://www.youtube.com/watch?v=fHba09QKOi0&feature=player_embedded
(“Decaffeination”)

8. Work Cited
Barstow, Kimberly. "The Case of the Missing Caffeine." ChemMatters April (1999): 12-13.
Print.
"Decaffeination." Restaurant Business Dec. 2005: 90. General OneFile. Web. 6 Apr. 2013.
http://go.galegroup.com.candycorn.lipscomb.edu/ps/i.do?id=GALE%7CA140408951&v=2.1&u=tel_k_dlhs&it=r&p=GPS&sw=w
Sturdivant, Shea. "French water process decaffeination." Tea & Coffee Trade Journal Sept.
1992: 31+. General OneFile. Web. 29 Apr. 2013.
http://go.galegroup.com.candycorn.lipscomb.edu/ps/i.do?id=GALE%7CA12686245&v=2.1&u=tel_k_dlhs&it=r&p=GPS&sw=w