My ninja, now we are talking...
The only problem I have been running into is how to restrict and maintain the pressure at the screen exit end of the cyclinder. You have to restrict the flow to maintain the pressure but then you sacrafice the flow velocity to get the material to leave the cylinder.. I looked at doin it just like BHO but the pressure still is an issue..
Still workin on it,,,thanks for the info.
Tex
If you're using straight propane this probably won't work as well as with butane--for this particular process (not a comparison between the solvents). The butane has a higher boiling point than the propane--this translates to much greater difficulty in keeping the propane liquid in the tube (it's already not the easiest for butane), it's also going to translate to greater pressure buildups and likely a much larger "cloud" of flammable gas in the working area (because more of it is boiling off at a given temp compared with butane).
There really is a
significant difference in these values for the two compounds. These molecules hold onto each other according non-polar interactions which mostly consist of
instantaneous dipoles which are created because electrons are constantly in motion. This interaction is much weaker than say, an ionic interaction. This is why non-polar compounds typically have lower boiling points than polar ones.
Essentially what boiling is, is raising the energy of these particles such that both their ability to hold on to one another, and the additional ability of the surrounding atmosphere to compress them together is surpassed by the energy input. This is why compounds can boil spontaneously under reduced atmosphere--the energy required for the molecules to spread out is much lower, and that energy barrier may have already been reached at room temperature if the atmosphere is evacuated.
While one extra CH2 might seem like a small addition from propane to butane--it actually has an enormous effect with regard to boiling point.
To my scientific mind, this particular setup has explosion written all over it. If I were to use propane as an extracting solvent--my first instinct would be to use a closed vessel system like Graywolf's.
