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Lyophilization, drying with minimal residues, and molecular distillation
These applications are beyond the vacuum range of diaphragm pumps. They call for vacuum systems with ultimate vacuums of 10-1 to 10-3 mbar; single- and two-stage rotary vane pumps provide these pressures at various volume flow rates. A convenient option especially for chemical applications is our chemistry-HYBRID pump RC 6, a combination of a rotary vane and a chemistry diaphragm pump. The special design often allows operation without an additional cold trap. The integrated diaphragm pump enhances condensate compatibility, reduces service needs and results in a longer pump life. The lower service demands greatly reduce lifetime costs of the RC 6 pump compared with a conventional rotary vane pump.
Process requirements
- low ultimate vacuum, depending upon the process conditions
- volume flow rate appropriate to system size (laboratory, pilot or production plant)
- regulation of shelf temperature and vacuum level, depending upon material to be dried (in freeze drying processes)
Pump requirements
- ultimate vacuum to 10-3 mbar
- depending upon process conditions, excellent pump condensate compatibility may be important for extended service life of the pump
- low ultimate vacuum even with open gas ballast for continuous condensate purge
- chemical resistance is essential when drying substances containing solvents
- chemistry-HYBRID pump RC 6 is recommended
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Improved chemical compatibility and less waste oil, for more aggressive and condensable vapors |
Screw pomp 10-3 mbar vacuum range, 100% oil-free, no abrasion |