Eh, what - no!?! Hexane and castor oil are completely different
Castor beans may be dangerously toxic, but that's nothing to do with it! You could, however,
possibly use castor oil for an extraction, if you did an A/B and only used sodium carbonate for the base stage. You would then have to recover the alkaloids from the castor oil using an acid (white vinegar would do) and subsequently decide how to clean up your crude acetates.
If you're really struggling to find hydrocarbons and aren't afraid of something a little experimental, you might want to take a look at the vodka/lime method which is currently in development:
Transform: Have you tried using lime to remove tannins from ayahuasca? I'm wondering if my normal Aya brew would cause less GI disruption if I mixed in some lime and took the water after it settled. I'm trying some now.
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