P
Pimpernickel
- 36
- 8
If you must filter, use a 1 micron sock filter, because a face filter blinds too fast.I have a closed loop system with a 3'x18" material chamber with a cooling jacket around it. It reduces down to a 1 1/2" ball valve and I put some coffee filters in the reducer to stop any very small particles from getting through. I vacuum my loaded system down, place the collection chamber in an ice/salt bath, and put an isopropanol/dry ice bath in the cooling jacket then wrap with towels to try to insulate it. I'll fill with distilled butane until I get build a bit of pressure then I let it sit for 30-60 minutes. I open the valve and the solvent drops down into the collection chamber. After a minute or so I can let it sit there for 30 minutes and not get another drop of solvent, I can open the tank and run more solvent through and see about the same amount of solvent come out. I close the valve and finish the process but when I take the top of the column off for cleaning I'll always have 300-1000mL of solvent coming out of it. That's a very large amount. It's dangerous, makes a mess, and ruins my yield but I cannot figure out why it's not draining into the collection chamber, any ideas? The cooling jacket gets down to -109F (according to the cooling bath section of wikipedia, I can only measure to -59 with my thermometer) but that's well above the freezing point of butane, it can't be gelling at that temp can it?
If the filter was clogged would that still allow liquid solvent through?
I went with pressure differential because Pimpernickel said that when he adds more solvent liquid passes through the filter.
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