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Re: oil from plants.
I am not sure of the exact process but it usually goes something like this. Since the goal is oil which is a hydrocarbon, one will use a light weight organic solvent that is essentually insoluble in water, i.e, butane may work. When the juices mix with this solvent, in countercurrent flow, the oil phase goes into the solvent and juices become water. Being lightweight and low boliing one evaporates the solvent for recycle, using a small side stream of oil. Any butane in the water is easy to recycle using solar heat.
If the oil in the plant is close to burnable, already, I would get very simple and extract it with gasoline. No boiling necessary. Just burn the combo, alterring the rate of solvent phase to get the correct blend. Place this in settling tanks to remove traces of water. You're good to go.
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