Good point. Fortuantely, the boiling point of butane is soooo much lower than everything else we are trying to get rid of, the butane should be long gone by the time any terps would be noticably affected.
I used that calculator and the results show I'd be boiling off THC way before a full vacuum just at room temperature. To use the calculator you need to know the boiling point of THC at 760mm of Hg is 157C/315F (from THC at Wiki,) also you need to CHOOSE "high molecular or high boiling point compounds" to get in the ball park for "heat of evaporation" factor, then you're good to plug in vacuum values and make your own table. You'll want a vacuum pressure unit converter, I'd post a link but fear moderation.
Peace, John
The exact "heat of evaporation" factor for delta 9 THC is 66.49 kj/mol (guy at TokeCity found it, but he didn't realize vac purgers were pulling a vacuum deeper than 1,000 microns while the two stage rotary vacuum pumps are pulling below 100 microns, often down to 25-50 microns, so he thought the facts proved THC wasn't being boiled off, such a beautiful presentation only to reach the wrong conclusion...) So, here's a scan of the vacuum conversion table with some of the corresponding correct boiling points for delta 9 THC (btw, "the heat of evaporation"/"enthalpy of vaporization" for n-butane is 22.41 kj/mol if you'd like to see the numbers of just how low a temperature the residual butane comes off at under vacuum...guy at TC deserves a round...)I used that calculator and the results show I'd be boiling off THC way before a full vacuum just at room temperature. To use the calculator you need to know the boiling point of THC at 760mm of Hg is 157C/315F (from THC at Wiki,) also you need to CHOOSE "high molecular or high boiling point compounds" to get in the ball park for "heat of evaporation" factor, then you're good to plug in vacuum values and make your own table. You'll want a vacuum pressure unit converter, I'd post a link but fear moderation.
