This one works. You should cross reference it with other SOPs on this forum. TBH it is a long SOP, 10-12 hour shift and you still aren’t done with solvent recovery, purging and distillation. I don’t recommend getting into this, since you need to be well trained, have a suitable lab and equipment, and be very careful. On top of that, it isn’t worth the effort and you won’t be saving/making any more money than buying distillate.
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