I have a closed tank. I pull 20 hg on it at 160 deg. I have a sight glass. How do you know when the methanol is out?
The methanol is sufficiently out when it passes the flash point test at 230C. A flash point tester is a necessary piece of equipment for you.
With that much vacuum (and good circulation and spraying) I would guess you could achieve ASTM at less than 190F.
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