8) :thumb_up: 
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- Thread starter damiana
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Trickster said:
Wow! :shock: :thumb_up:
Espurrr said:
There is no vacuum. It is in a small beaker.
when spinnin down the dcm using a rotary vane pump, I felt spaced out for a couple mins. could’ve just been the solvent vapors,
but wasn’t placebo
but wasn’t placebo
benzyme said:
Rotary vane pump? Were you pumping the rotovap? Too much vacuum, I think. If you did not have a cold trap between the pump and the system some DCM was unable to liquefy in the condenser and was pumped into your lab environment. I saw that happening even with a 2-stage diaphragm pump at vacuum around 300 mbar or less. There is a definite smell of DCM in the air.
Usually I remove most of DCM at 500 mbar and 35-37C. The higher the temp and the pressure, the better, because the water feeding the rotovap condenser is around 12C these days and I need the temp difference to be as high as possible for the condenser to work efficiently.
When the DCM stops dripping from the rotovap condenser I gradually lower the pressure to ~10-15 mbar (my diaphragm pump would not go lower than that and I am too lazy to switch to a rotary vane).
P.S. Sorry for telling some obvious things to real chemists, but it could be of some help to aspiring ones.
yeah, I would partially close the vac reg. valve, open the coldfinger condenser valve, evacuate for a few secs, then close the condenser valve.
null24 said:
And buddha too
6 billion suns. The weight of our sun in relation to that thing is about equal to yours or mine in relation to that of the whole of mankind. :lol: :lol: :lol: :lol:Loveall said:
it ain't honey oil
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