Quote:
Originally Posted by Eldonko  - DI is max -77C, not -90C ;)
- You may want to invest in a digital thermometer and mount probe on bottom of pot (see pic).
- Dice will cool best if you crush first, and maintain a few inches, packing down often.
- Use about 2 oz of methanol or whatever, as long as its 90%+ |
I read somewhere that certain liquids would lower the sublimination point of DI, similar to how salt and ice water will be colder than just ice. Google manages to turn up this though:
Ethanol/Dry ice -72
Acetone/Dry ice -78
Isopropanol/Dry ice -78
Sulfur dioxide/Dry ice -82
Diethyl ether/Dry ice -100
So clearly (and unsurprisingly) the -92°C was wrong, but with Diethyl ether, DI can get down to -100°C. Too bad it is extremely flammable.
And thanks for the advice on how to fill the tube. We were using small pellets about 3-5cm by 1.5cm by 1.5cm, and we used WAY too much ethanol (to the point where it was almost overflowing when we added more DI).