does anyone know the solubility of:

acetominophen

asprin

caffeine

(i would like to dissolve the caffeine, leaving the acetaminophen and asprin behind, to be filtered out and evaporate the water to leave pure caffeine...will a cold-water extraction work?)

Acetaminophen and aspirin are always difficult to separate out of compounds they typically are in.

Cold water will limit the solubility of both, but it may limit the caffeine as well, thus making that method useless.

A google search of each should give enough hits to find a MSDS which will show g./L. solubility in water at a given temp. This will help you to calculate how much of each one will still be in solution when you chill it down.

Maybe someone will look it up for you. I'm too lazy.

If you have to ability to support high pressure's and relatively high temps, you can use CO2 to extract caffiene from coffee beans, and I would assume from any other caffiene containing product

The only problem with that being is you need pressures in excess of 73atm(1073psia) and temperatures above 31.1*C(88*F). So its probably not a feasible option for small time dealings