Chapter 4: Using Your RapidVap
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27
Original instructions
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