How much are you trying to do? Steam stilling takes you down the wet material rabbit hole. It’s great for hemp but…proceed at your own risk with plant material you care about. I look forward to the day that hemp oils don’t suck, sorry they do.
Microwave can give you even worse smelling oils. Sorry, Milestone but your machine is crap for the price. Build your own, you can find specs online. The IDCO model looks cool but at 65k euro, ouch!
As far as the under vacuum option. I found the commercial units running too hot, giving low essential oil yields, off yellow or off green at scale, barely better than a well packed and well staffed atmospheric still. Unless you’re doing this at home you’re going to want to scale. When one of the largest cannabis terpene companies in California, with the largest market share of one of the best vape pens for tasting cannabis vape pens, passes on a technology, it’s for a reason. I’ll be talking about this in LA in July.
Regardless, I’m interested revisiting the tech, now that I have a gold standard of what cannabis essential oils can be. @Soxhlet , I want to build a small unit for R&D, and am looking for a competent engineer.
To anyone pursuing the essential oils from this amazing and challenging plant. There are more of us out there than you’d think.
Come to Oakland, bring your work, smell ours. I found a good chemist who is committed to getting pure essential oils tested (42-terpenes) at half the rate of the companies that test 35. For those who really want know, I have the contact for a lab in Boulder, CO that will do over 100 compounds, but have never used them.