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Thread: Triple evacuation
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08-08-2006, 09:36 AM #11
Re: Triple evacuation
First off my practical experience of refrigeration is limited, but I have used vacuum ovens a lot. These always had a nitrogen bleed at the opposite end of the chamber to the vacuum connection, say 20ml/min in an oven of about a cubic metre. Without this, solvents with higher boiling points (60-80C) would not leave the oven, they'd evaporate off the stuff you were drying (oven set at 40C) and pool in the bottom. A small gas bleed carried away the solvent vapour to the vac pump, prevented the oven being a dead end. I've no doubt Argus is right (and you others), but I would have though that filling a system with nitrogen and sucking it back out will better help shift moisture. But then maybe you only need to do it once after all?
It's a lovely day to pump some gas
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