The way coffee companies decaffeinate their coffee is to steam the coffee beans for around 30 minutes which causes the coffee beans pores to open up.
Once they have the coffee beans pores opened they then rinse the coffee beans with either methylene chloride or ethyl acetate for about 10 hours to remove the caffeine.
When the steam opens up the pores of the coffee beans the coffee beans then also become receptive to solvent and this method of decaffeinating coffee beans is called the Direct Solvent Based Process.
Because of the process involved in decaffeinating coffee beans it's said that coffee that has been decaffeinated could lead to heart problems and other health problems as well.