The last time I extracted was ~2 years ago. A bottle of heptane is how much? I fail to see how spending a bit on a good solvent is "expensive" for something that is totally priceless- and this is coming from someone who lives in poverty. I think you would have to be extracting a lot for this to become expensive. Just my take on it!
I would do ~90ml pulls, possibly heated up in a double-boiler style bowl set up, or just use the heat from the NaOH reaction in the extraction vessel, 3 or 4 pulls should get it all. If you aren't happy with your yield after that, you can always reuse the heptane and extract more.
I would do ~90ml pulls, possibly heated up in a double-boiler style bowl set up, or just use the heat from the NaOH reaction in the extraction vessel, 3 or 4 pulls should get it all. If you aren't happy with your yield after that, you can always reuse the heptane and extract more.