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Optimizing Büchi® Rotary Evaporator Applications

for efficient use of rotary evaporators under ideal conditions. There are instances, however, when temperature-sensitive samples or high-/low-boiling solvents prohibit operation under these parameters. A more generalized rule is the 20°C ? T Rule, which states that the condenser should be 20°C lower than the vapor pressure temperature and the bath temperature should be 20°C higher than the vapor pressure temperature.

By following these simple guidelines, costs can be reduced and results can be optimized.

Choosing Vacuum Pressure

Vacuum Controllers play a critical role in regulating evaporation experiments: without one, experiments can only run at maximum vacuum pressure. Vacuum Controllers reduce the risks of sample loss and lab contamination, and they may be programmed to reduce bumping and foaming and perform automatic distillations.

Once a Vacuum Controller has become part of your lab set-up, how is the appropriate vacuum for the solvent calculated?

The vapor pressure temperature under vacuum of most common solvents can be calculated by using the following formula introduced by Reckhard1 in 1958. Refer to Table A for a listing of physical constants for common solvents.

Log P = 3.006 [Ts Tp]
_______

[b Tp]

P = vacuum pressure
Ts = boiling point (°K) at a pressure of 1013 mbar
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