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Re: oil from plants.
I am not sure of the composition of the oil. Butanol may work in the lab but might create some practical problems during scale-up, due to the energy and process requirement needed for recycle. Butane was chosen because it is a reasonably good organic solvent that boils near room temperature. This makes it easier to recycle using very little energy. Solar heating alone could work for evaporation.
Usually sticky oils contain both water and organics, with the white sap appearing to be an emulsion of the two. A little pre-drying will help lower the water content. Extraction through gasoline, would remove the organic fraction into the gasoline (octane instead of butane) with the aqueous phase sinking to the bottom. Reducing the water with pre-drying will reduce the amount of water needed to be treated before discharge.
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