Interdependence. Interdependence is a key idea in science. As students learn about science, they begin to understand that the earth is not a group of discrete parts but a continuous environment existing over time as well as place.
In order to remove the caffeine from coffee beans, the beans are washed in a solvent (a liquid capable of dissolving substances), transferring the caffeine from bean to liquid in a process known as extraction. To extract caffeine from whole coffee beans, the following solvents can be used:
2) The DirectâSolvent Based Process. In this method of decaffeination the beans are steamed for about 30 minutes in order to open their pores. Once the coffee beans are receptive to a solvent, they are repeatedly rinsed with either methylene chloride or ethyl acetate for about 10 hours to remove the caffeine. Therefore all decaffeination processes use a decaffeinating agent (such as methylene chloride, activated charcoal, CO 2, or ethyl acetate). 2  These agents help speed up the process and minimize the âwashed-outâ effects that water alone would have on the taste of decaf coffee.