Page 90 -

Page 90 Stuart® Catalogue
Introduction
Rotary evaporators
• Simple, counterbalanced lift mechanism
• PTFE/glass liquid pathway for chemical inertness
• Sparkless induction motor
• Long life graphite impregnated PTFE vacuum seal
• Efficient flask and vapour tube ejection system
Rotary evaporators are distillation units that incorporate an efficient
condenser with a rotary flask system. As the flask containing the solvent is
rotated it continually transfers a thin layer of liquid over the entire inner
surface. This gives a very large surface area for evaporation that is effected
by heating from the accessory waterbath (see page 94).
They are the ideal tools for many everyday laboratory applications including:-
• Concentration of solutions
• Reclamation of solvents
• Vacuum drying of wet solids
• Degassing liquids
The rotating system is fitted with a special seal that allows the apparatus to
be placed under vacuum. This reduces the boiling point of the solvents and
removes the vapour phase making the process much more efficient.
See page 95 for details of the vacuum pump.
Each unit is also provided with an easy to use vacuum release and a
continuous feed system, which allows more solvent to be drawn into the
rotating Florentine flask without the need to stop the operation. There are
three patterns of condenser available depending on the application and
space available (see page 91 for full list of components included in each
set ).
• Rotary evaporator with diagonal glass condenser for
standard distillations.
• Rotary evaporator with vertical glass condenser for distillation of
solvents with higher boiling points. 20% narrower than RE300 saving
space.
• Rotary evaporator with cold finger glass condenser for use with ice
or dry ice for volatile or low boiling solvents. No cooling water
required. Unique drain to empty the large 1 litre trap very easily.
For each condenser pattern, there is also a plastic coating option for extra
safety when using the glassware under vacuum. It acts as a safety screen,
contains the glassware pieces and gives the operator sufficient time to
transfer any potentially dangerous chemicals to a suitable vessel without
spillage.
See page 135 for guide to solvent evaporation temperatures. RE300 and RE300DB
Stuart® Catalogue