Labconco RapidVap Vacuum, N2 and N2/48 Evaporation Systems 7910015 - Manual (Page 37)

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Chapter 4: Using Your RapidVap
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Constant b Groups
0.200 Aliphatic hydrocarbons
Aliphatic halogenated hydrocarbons
0.195 Aromatic hydrocarbons
Aromatic halogenated hydrocarbons
Ketones
Ethers
Nitriles
Heterocyclic
compounds
0.190 Aldehydes
Esters
0.185 Amines
0.180 Phenols
0.165 Acids
0.160 Alcohols
Time Setting Guidelines
It is often desirable to stop the concentration process
before the solvent is entirely evaporated. This is
accomplished by using glassware that has a small
diameter stem on the bottom and using the “Time”
function to shut off the process after a predetermined
interval of time.
The “Cool Zone” feature is available on the RapidVap
N
2
with 8 places and is not available on the RapidVap
N
2
with 48 places.
The design of the RapidVap N
2
causes the evaporation
to proceed quickly when the sample is in the larger
upper chamber of the sample tubes. When the solvent
evaporates sufficiently to drop the level into the smaller
stem, the evaporation rate decreases significantly. This
phenomenon allows the solvent in all sample tubes to
evaporate out of the large upper chamber before any of
the small chambers are completely evaporated dry
providing that all sample tubes are filled with nearly the
same starting volumes.
N