Buchi Rotavapor R-220, Руководство пользователя

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BÜCHI Rotavapor R-220
3 Function
Fig. 2: Principle of operation of the R-220
3 Function
A vacuum rotary evaporator is used for quick single-stage
distillations that treat the product gently. The process is based
on the evaporation and condensation of solvents in a rotating
evaporating flask.
It is possible to work under a vacuum to ensure gentler treat-
ment of the product and increase productive output.
Distillation may be done either under a vacuum or at atmos-
pheric pressure.
A secure closeness is guaranteed in the low pressure range.
3.1 Principle of Operation
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Evaporation Zone
The solvent in the evaporating flask is heated by the heating
bath. The rotation of the evaporating flask ensures an in-
tensive exchange of heat and mass within the contents of
the flask, forming a thin film of solvent on the inner surface
of the flask. This combination of turbulence and film prevents
local overheating and ensures high distillation speed.
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Rotary Drive
The drive unit ensure the uniform rotation of the evaporating
flask.
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Cooling Zone
The solvent vapor flows into the cooler at a high speed.
This is where the energy in the solvent vapor is transferred
to the cooling medium (e.g., water). The solvent condenses.
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Receiving Flask
The receiving flask is used to collect the condensate.
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Vacuum Cover
The system pressure is reduced so as to lower the boiling
point of the solvent. The reduction in thermal loading that
results ensures gentle treatment of the product and offers
energetic advantages.
The pressure (vacuum) of distillation, the temperature of the
heating bath, the rotational speed, and the size of the evapo-
rating flask all affect the evaporation output. Refer to Chapter
5.3 for how to select the optimum conditions of distillation.
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