You need to have java to run the applet, allows you to play with boiling points under different pressure in kPa or mmHg,
http://www.ch.cam.ac.uk/magnus/boil.html (http://www.ch.cam.ac.uk/magnus/boil.html)
It actually works really well. I can pull safrole between 60-66. Iso comes over 74-80. When I play with these values, I get the exact same pressure!
By the way, i found a ref for pmk boiling point at standard pressure.
It boils at 557 kelvin or 284 celsius +/- 3
Using the applet, my vacuum should pull it at around 94-95 degrees, which it actually does. Good way to know your real vacuum, once you know at what temp your products is distilled