Rotary evaporators and parallel evaporators

Vacuum requirements for rotation evaporators can vary greatly depending upon the solvent and evaporating temperature. This is the reason why a modern vacuum system includes built-in vacuum regulation to help you reach optimum evaporating rates. This significantly shortens the process duration and minimizes environmental and laboratory air pollution.

Process requirements

medium to high vacuum requirements
fast and highly sensitive vacuum regulation with samples that tend to superheating or foaming
vacuum regulation for short process times and high reproducibility
optimum condensation in the cooler of the rotation evaporator
recovery of residual solvent vapors after the pump

Demands made of the vacuum pump

excellent chemical and condensate compatibility
effective gas ballast equipment to prevent condensation in the pump and protect pump performance
excellent ultimate vacuum even with gas ballast operation for continuous evaporation
low ultimate vacuum needed at low condensing temperatures or with high boiling point solvents
emission condenser for solvent recovery minimizes environmental and laboratory air pollution
for applications with larger amounts of inflammable solvents: pumps and gauges with ATEX-approval

An example of a typical high-temperature boiling solvent is DMF. Its vapor pressure at 40°C is at approximately 11 mbar. For such high-temperature boilers, we recommend a system or pumping unit that reaches 4 mbar of ultimate vacuum even with gas ballast, such as the PC 3001 VARIO.